diff --git a/src/client/src/tscPrepare.c b/src/client/src/tscPrepare.c
index d251867eaaea0cc368a8886bc68c74eed25c9aa9..d33bdbb588a362a58816b23eb2226ae56da8f456 100644
--- a/src/client/src/tscPrepare.c
+++ b/src/client/src/tscPrepare.c
@@ -148,7 +148,7 @@ static int normalStmtBindParam(STscStmt* stmt, TAOS_BIND* bind) {
         break;
 
       default:
-        tscDebug("param %d: type mismatch or invalid", i);
+        tscDebug("0x%"PRIx64" param %d: type mismatch or invalid", stmt->pSql->self, i);
         return TSDB_CODE_TSC_INVALID_VALUE;
     }
   }
@@ -804,7 +804,7 @@ static int insertStmtBindParam(STscStmt* stmt, TAOS_BIND* bind) {
   
   if (pStmt->multiTbInsert) {
     if (pCmd->pTableBlockHashList == NULL) {
-      tscError("Table block hash list is empty");
+      tscError("0x%"PRIx64" Table block hash list is empty", pStmt->pSql->self);
       return TSDB_CODE_TSC_APP_ERROR;
     }
     
@@ -850,7 +850,7 @@ static int insertStmtBindParam(STscStmt* stmt, TAOS_BIND* bind) {
 
     int code = doBindParam(pBlock, data, param, &bind[param->idx], 1);
     if (code != TSDB_CODE_SUCCESS) {
-      tscDebug("param %d: type mismatch or invalid", param->idx);
+      tscDebug("0x%"PRIx64" param %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
       return code;
     }
   }
@@ -866,18 +866,34 @@ static int insertStmtBindParamBatch(STscStmt* stmt, TAOS_MULTI_BIND* bind, int c
   
   STableDataBlocks* pBlock = NULL;
   
-  if (pCmd->pTableBlockHashList == NULL) {
-    tscError("Table block hash list is empty");
-    return TSDB_CODE_TSC_APP_ERROR;
-  }
+  if (pStmt->multiTbInsert) {
+    if (pCmd->pTableBlockHashList == NULL) {
+      tscError("0x%"PRIx64" Table block hash list is empty", pStmt->pSql->self);
+      return TSDB_CODE_TSC_APP_ERROR;
+    }
 
-  STableDataBlocks** t1 = (STableDataBlocks**)taosHashGet(pCmd->pTableBlockHashList, (const char*)&pStmt->mtb.currentUid, sizeof(pStmt->mtb.currentUid));
-  if (t1 == NULL) {
-    tscError("no table data block in hash list, uid:%" PRId64 , pStmt->mtb.currentUid);
-    return TSDB_CODE_TSC_APP_ERROR;
-  }
+    STableDataBlocks** t1 = (STableDataBlocks**)taosHashGet(pCmd->pTableBlockHashList, (const char*)&pStmt->mtb.currentUid, sizeof(pStmt->mtb.currentUid));
+    if (t1 == NULL) {
+      tscError("0x%"PRIx64" no table data block in hash list, uid:%" PRId64 , pStmt->pSql->self, pStmt->mtb.currentUid);
+      return TSDB_CODE_TSC_APP_ERROR;
+    }
 
-  pBlock = *t1;
+    pBlock = *t1;
+  } else {
+    STableMetaInfo* pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, 0, 0);
+
+    STableMeta* pTableMeta = pTableMetaInfo->pTableMeta;
+    if (pCmd->pTableBlockHashList == NULL) {
+      pCmd->pTableBlockHashList = taosHashInit(16, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), true, false);
+    }
+
+    int32_t ret =
+        tscGetDataBlockFromList(pCmd->pTableBlockHashList, pTableMeta->id.uid, TSDB_PAYLOAD_SIZE, sizeof(SSubmitBlk),
+                                pTableMeta->tableInfo.rowSize, &pTableMetaInfo->name, pTableMeta, &pBlock, NULL);
+    if (ret != 0) {
+      return ret;
+    }
+  }
 
   assert(colIdx == -1 || (colIdx >= 0 && colIdx < pBlock->numOfParams));
 
@@ -898,13 +914,13 @@ static int insertStmtBindParamBatch(STscStmt* stmt, TAOS_MULTI_BIND* bind, int c
     for (uint32_t j = 0; j < pBlock->numOfParams; ++j) {
       SParamInfo* param = &pBlock->params[j];
       if (bind[param->idx].num != rowNum) {
-        tscError("param %d: num[%d:%d] not match", param->idx, rowNum, bind[param->idx].num);
+        tscError("0x%"PRIx64" param %d: num[%d:%d] not match", pStmt->pSql->self, param->idx, rowNum, bind[param->idx].num);
         return TSDB_CODE_TSC_INVALID_VALUE;
       }
       
       int code = doBindBatchParam(pBlock, param, &bind[param->idx], pCmd->batchSize);
       if (code != TSDB_CODE_SUCCESS) {
-        tscError("param %d: type mismatch or invalid", param->idx);
+        tscError("0x%"PRIx64" param %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
         return code;
       }
     }
@@ -915,7 +931,7 @@ static int insertStmtBindParamBatch(STscStmt* stmt, TAOS_MULTI_BIND* bind, int c
    
     int code = doBindBatchParam(pBlock, param, bind, pCmd->batchSize);
     if (code != TSDB_CODE_SUCCESS) {
-      tscError("param %d: type mismatch or invalid", param->idx);
+      tscError("0x%"PRIx64" param %d: type mismatch or invalid", pStmt->pSql->self, param->idx);
       return code;
     }
 
@@ -940,7 +956,7 @@ static int insertStmtUpdateBatch(STscStmt* stmt) {
 
   STableDataBlocks** t1 = (STableDataBlocks**)taosHashGet(pCmd->pTableBlockHashList, (const char*)&stmt->mtb.currentUid, sizeof(stmt->mtb.currentUid));
   if (t1 == NULL) {
-    tscError("no table data block in hash list, uid:%" PRId64 , stmt->mtb.currentUid);
+    tscError("0x%"PRIx64" no table data block in hash list, uid:%" PRId64 , pSql->self, stmt->mtb.currentUid);
     return TSDB_CODE_TSC_APP_ERROR;
   }
 
@@ -1110,7 +1126,7 @@ static int insertBatchStmtExecute(STscStmt* pStmt) {
   int32_t code = 0;
   
   if(pStmt->mtb.nameSet == false) {
-    tscError("no table name set");
+    tscError("0x%"PRIx64" no table name set", pStmt->pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
   
@@ -1276,13 +1292,13 @@ int taos_stmt_set_tbname(TAOS_STMT* stmt, const char* name) {
 
   if (name == NULL) {
     terrno = TSDB_CODE_TSC_APP_ERROR;
-    tscError("name is NULL");
+    tscError("0x%"PRIx64" name is NULL", pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
 
   if (pStmt->multiTbInsert == false || !tscIsInsertData(pSql->sqlstr)) {
     terrno = TSDB_CODE_TSC_APP_ERROR;
-    tscError("not multi table insert");
+    tscError("0x%"PRIx64" not multi table insert", pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
 
@@ -1292,7 +1308,7 @@ int taos_stmt_set_tbname(TAOS_STMT* stmt, const char* name) {
 
     STableDataBlocks** t1 = (STableDataBlocks**)taosHashGet(pStmt->mtb.pTableBlockHashList, (const char*)&pStmt->mtb.currentUid, sizeof(pStmt->mtb.currentUid));
     if (t1 == NULL) {
-      tscError("no table data block in hash list, uid:%" PRId64 , pStmt->mtb.currentUid);
+      tscError("0x%"PRIx64" no table data block in hash list, uid:%" PRId64 , pSql->self, pStmt->mtb.currentUid);
       return TSDB_CODE_TSC_APP_ERROR;
     }
 
@@ -1301,7 +1317,7 @@ int taos_stmt_set_tbname(TAOS_STMT* stmt, const char* name) {
 
     taosHashPut(pCmd->pTableBlockHashList, (void *)&pStmt->mtb.currentUid, sizeof(pStmt->mtb.currentUid), (void*)t1, POINTER_BYTES);
     
-    tscDebug("table:%s is already prepared, uid:%" PRIu64, name, pStmt->mtb.currentUid);
+    tscDebug("0x%"PRIx64" table:%s is already prepared, uid:%" PRIu64, pSql->self, name, pStmt->mtb.currentUid);
     return TSDB_CODE_SUCCESS;
   }
   
@@ -1359,7 +1375,8 @@ int taos_stmt_close(TAOS_STMT* stmt) {
   STscStmt* pStmt = (STscStmt*)stmt;
   if (!pStmt->isInsert) {
     taosHashCleanup(pStmt->mtb.pTableHash);
-    
+    taosHashCleanup(pStmt->mtb.pTableBlockHashList);
+
     SNormalStmt* normal = &pStmt->normal;
     if (normal->params != NULL) {
       for (uint16_t i = 0; i < normal->numParams; i++) {
@@ -1394,12 +1411,17 @@ int taos_stmt_bind_param(TAOS_STMT* stmt, TAOS_BIND* bind) {
 int taos_stmt_bind_param_batch(TAOS_STMT* stmt, TAOS_MULTI_BIND* bind) {
   STscStmt* pStmt = (STscStmt*)stmt;
   if (bind == NULL || bind->num <= 0) {
-    tscError("invalid parameter");
+    tscError("0x%"PRIx64" invalid parameter", pStmt->pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
     
-  if (!pStmt->isInsert || !pStmt->multiTbInsert || !pStmt->mtb.nameSet) {
-    tscError("not or invalid batch insert");
+  if (!pStmt->isInsert) {
+    tscError("0x%"PRIx64" not or invalid batch insert", pStmt->pSql->self);
+    return TSDB_CODE_TSC_APP_ERROR;
+  }
+
+  if (pStmt->multiTbInsert && !pStmt->mtb.nameSet) {
+    tscError("0x%"PRIx64" no table name set", pStmt->pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
   
@@ -1409,15 +1431,21 @@ int taos_stmt_bind_param_batch(TAOS_STMT* stmt, TAOS_MULTI_BIND* bind) {
 int taos_stmt_bind_single_param_batch(TAOS_STMT* stmt, TAOS_MULTI_BIND* bind, int colIdx) {
   STscStmt* pStmt = (STscStmt*)stmt;
   if (bind == NULL || bind->num <= 0) {
-    tscError("invalid parameter");
+    tscError("0x%"PRIx64" invalid parameter", pStmt->pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
-    
-  if (!pStmt->isInsert || !pStmt->multiTbInsert || !pStmt->mtb.nameSet) {
-    tscError("not or invalid batch insert");
+
+  if (!pStmt->isInsert) {
+    tscError("0x%"PRIx64" not or invalid batch insert", pStmt->pSql->self);
     return TSDB_CODE_TSC_APP_ERROR;
   }
-  
+
+  if (pStmt->multiTbInsert && !pStmt->mtb.nameSet) {
+    tscError("0x%"PRIx64" no table name set", pStmt->pSql->self);
+    return TSDB_CODE_TSC_APP_ERROR;
+  }
+
+
   return insertStmtBindParamBatch(pStmt, bind, colIdx);
 }
 
@@ -1542,7 +1570,7 @@ int taos_stmt_get_param(TAOS_STMT *stmt, int idx, int *type, int *bytes) {
     }
 
     if (idx<0 || idx>=pBlock->numOfParams) {
-      tscError("param %d: out of range", idx);
+      tscError("0x%"PRIx64" param %d: out of range", pStmt->pSql->self, idx);
       abort();
     }
 
diff --git a/tests/script/api/batchprepare.c b/tests/script/api/batchprepare.c
new file mode 100644
index 0000000000000000000000000000000000000000..9b204c2f4aac206f94c555b4274326178c18095b
--- /dev/null
+++ b/tests/script/api/batchprepare.c
@@ -0,0 +1,2494 @@
+// TAOS standard API example. The same syntax as MySQL, but only a subet 
+// to compile: gcc -o prepare prepare.c -ltaos
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "taos.h"
+#include <sys/time.h>
+#include <pthread.h>
+#include <unistd.h>
+
+typedef struct {
+  TAOS     *taos;
+  int idx;
+}T_par;
+
+void taosMsleep(int mseconds);
+
+unsigned long long getCurrentTime(){
+    struct timeval tv;
+    if (gettimeofday(&tv, NULL) != 0) {
+        perror("Failed to get current time in ms");
+        exit(EXIT_FAILURE);
+    }
+
+    return (uint64_t)tv.tv_sec * 1000000ULL + (uint64_t)tv.tv_usec;
+}
+
+
+
+int stmt_func1(TAOS_STMT *stmt) {
+  struct {
+      int64_t ts;
+      int8_t b;
+      int8_t v1;
+      int16_t v2;
+      int32_t v4;
+      int64_t v8;
+      float f4;
+      double f8;
+      char bin[40];
+      char blob[80];
+  } v = {0};
+  
+  TAOS_BIND params[10];
+  params[0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+  params[0].buffer_length = sizeof(v.ts);
+  params[0].buffer = &v.ts;
+  params[0].length = &params[0].buffer_length;
+  params[0].is_null = NULL;
+
+  params[1].buffer_type = TSDB_DATA_TYPE_BOOL;
+  params[1].buffer_length = sizeof(v.b);
+  params[1].buffer = &v.b;
+  params[1].length = &params[1].buffer_length;
+  params[1].is_null = NULL;
+
+  params[2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+  params[2].buffer_length = sizeof(v.v1);
+  params[2].buffer = &v.v1;
+  params[2].length = &params[2].buffer_length;
+  params[2].is_null = NULL;
+
+  params[3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+  params[3].buffer_length = sizeof(v.v2);
+  params[3].buffer = &v.v2;
+  params[3].length = &params[3].buffer_length;
+  params[3].is_null = NULL;
+
+  params[4].buffer_type = TSDB_DATA_TYPE_INT;
+  params[4].buffer_length = sizeof(v.v4);
+  params[4].buffer = &v.v4;
+  params[4].length = &params[4].buffer_length;
+  params[4].is_null = NULL;
+
+  params[5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+  params[5].buffer_length = sizeof(v.v8);
+  params[5].buffer = &v.v8;
+  params[5].length = &params[5].buffer_length;
+  params[5].is_null = NULL;
+
+  params[6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+  params[6].buffer_length = sizeof(v.f4);
+  params[6].buffer = &v.f4;
+  params[6].length = &params[6].buffer_length;
+  params[6].is_null = NULL;
+
+  params[7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+  params[7].buffer_length = sizeof(v.f8);
+  params[7].buffer = &v.f8;
+  params[7].length = &params[7].buffer_length;
+  params[7].is_null = NULL;
+
+  params[8].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[8].buffer_length = sizeof(v.bin);
+  params[8].buffer = v.bin;
+  params[8].length = &params[8].buffer_length;
+  params[8].is_null = NULL;
+
+  params[9].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[9].buffer_length = sizeof(v.bin);
+  params[9].buffer = v.bin;
+  params[9].length = &params[9].buffer_length;
+  params[9].is_null = NULL;
+
+  int is_null = 1;
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+  
+  for (int zz = 0; zz < 10; zz++) {
+    char buf[32];
+    sprintf(buf, "m%d", zz);
+    code = taos_stmt_set_tbname(stmt, buf);
+    if (code != 0){
+      printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+    }  
+    v.ts = 1591060628000 + zz * 10;
+    for (int i = 0; i < 10; ++i) {
+      v.ts += 1;
+      for (int j = 1; j < 10; ++j) {
+        params[j].is_null = ((i == j) ? &is_null : 0);
+      }
+      v.b = (int8_t)(i+zz*10) % 2;
+      v.v1 = (int8_t)(i+zz*10);
+      v.v2 = (int16_t)((i+zz*10) * 2);
+      v.v4 = (int32_t)((i+zz*10) * 4);
+      v.v8 = (int64_t)((i+zz*10) * 8);
+      v.f4 = (float)((i+zz*10) * 40);
+      v.f8 = (double)((i+zz*10) * 80);
+      for (int j = 0; j < sizeof(v.bin) - 1; ++j) {
+        v.bin[j] = (char)((i+zz)%10 + '0');
+      }
+
+      taos_stmt_bind_param(stmt, params);
+      taos_stmt_add_batch(stmt);
+    }
+  }
+
+  if (taos_stmt_execute(stmt) != 0) {
+    printf("failed to execute insert statement.\n");
+    exit(1);
+  }
+
+  return 0;
+}
+
+
+int stmt_func2(TAOS_STMT *stmt) {
+  struct {
+      int64_t ts;
+      int8_t b;
+      int8_t v1;
+      int16_t v2;
+      int32_t v4;
+      int64_t v8;
+      float f4;
+      double f8;
+      char bin[40];
+      char blob[80];
+  } v = {0};
+  
+  TAOS_BIND params[10];
+  params[0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+  params[0].buffer_length = sizeof(v.ts);
+  params[0].buffer = &v.ts;
+  params[0].length = &params[0].buffer_length;
+  params[0].is_null = NULL;
+
+  params[1].buffer_type = TSDB_DATA_TYPE_BOOL;
+  params[1].buffer_length = sizeof(v.b);
+  params[1].buffer = &v.b;
+  params[1].length = &params[1].buffer_length;
+  params[1].is_null = NULL;
+
+  params[2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+  params[2].buffer_length = sizeof(v.v1);
+  params[2].buffer = &v.v1;
+  params[2].length = &params[2].buffer_length;
+  params[2].is_null = NULL;
+
+  params[3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+  params[3].buffer_length = sizeof(v.v2);
+  params[3].buffer = &v.v2;
+  params[3].length = &params[3].buffer_length;
+  params[3].is_null = NULL;
+
+  params[4].buffer_type = TSDB_DATA_TYPE_INT;
+  params[4].buffer_length = sizeof(v.v4);
+  params[4].buffer = &v.v4;
+  params[4].length = &params[4].buffer_length;
+  params[4].is_null = NULL;
+
+  params[5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+  params[5].buffer_length = sizeof(v.v8);
+  params[5].buffer = &v.v8;
+  params[5].length = &params[5].buffer_length;
+  params[5].is_null = NULL;
+
+  params[6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+  params[6].buffer_length = sizeof(v.f4);
+  params[6].buffer = &v.f4;
+  params[6].length = &params[6].buffer_length;
+  params[6].is_null = NULL;
+
+  params[7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+  params[7].buffer_length = sizeof(v.f8);
+  params[7].buffer = &v.f8;
+  params[7].length = &params[7].buffer_length;
+  params[7].is_null = NULL;
+
+  params[8].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[8].buffer_length = sizeof(v.bin);
+  params[8].buffer = v.bin;
+  params[8].length = &params[8].buffer_length;
+  params[8].is_null = NULL;
+
+  params[9].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[9].buffer_length = sizeof(v.bin);
+  params[9].buffer = v.bin;
+  params[9].length = &params[9].buffer_length;
+  params[9].is_null = NULL;
+
+  int is_null = 1;
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  for (int l = 0; l < 100; l++) {
+    for (int zz = 0; zz < 10; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+      v.ts = 1591060628000 + zz * 100 * l;
+      for (int i = 0; i < zz; ++i) {
+        v.ts += 1;
+        for (int j = 1; j < 10; ++j) {
+          params[j].is_null = ((i == j) ? &is_null : 0);
+        }
+        v.b = (int8_t)(i+zz*10) % 2;
+        v.v1 = (int8_t)(i+zz*10);
+        v.v2 = (int16_t)((i+zz*10) * 2);
+        v.v4 = (int32_t)((i+zz*10) * 4);
+        v.v8 = (int64_t)((i+zz*10) * 8);
+        v.f4 = (float)((i+zz*10) * 40);
+        v.f8 = (double)((i+zz*10) * 80);
+        for (int j = 0; j < sizeof(v.bin) - 1; ++j) {
+          v.bin[j] = (char)((i+zz)%10 + '0');
+        }
+
+        taos_stmt_bind_param(stmt, params);
+        taos_stmt_add_batch(stmt);
+      }
+    }
+
+    if (taos_stmt_execute(stmt) != 0) {
+      printf("failed to execute insert statement.\n");
+      exit(1);
+    }
+
+  }
+
+
+  return 0;
+}
+
+
+
+
+int stmt_func3(TAOS_STMT *stmt) {
+  struct {
+      int64_t ts;
+      int8_t b;
+      int8_t v1;
+      int16_t v2;
+      int32_t v4;
+      int64_t v8;
+      float f4;
+      double f8;
+      char bin[40];
+      char blob[80];
+  } v = {0};
+  
+  TAOS_BIND params[10];
+  params[0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+  params[0].buffer_length = sizeof(v.ts);
+  params[0].buffer = &v.ts;
+  params[0].length = &params[0].buffer_length;
+  params[0].is_null = NULL;
+
+  params[1].buffer_type = TSDB_DATA_TYPE_BOOL;
+  params[1].buffer_length = sizeof(v.b);
+  params[1].buffer = &v.b;
+  params[1].length = &params[1].buffer_length;
+  params[1].is_null = NULL;
+
+  params[2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+  params[2].buffer_length = sizeof(v.v1);
+  params[2].buffer = &v.v1;
+  params[2].length = &params[2].buffer_length;
+  params[2].is_null = NULL;
+
+  params[3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+  params[3].buffer_length = sizeof(v.v2);
+  params[3].buffer = &v.v2;
+  params[3].length = &params[3].buffer_length;
+  params[3].is_null = NULL;
+
+  params[4].buffer_type = TSDB_DATA_TYPE_INT;
+  params[4].buffer_length = sizeof(v.v4);
+  params[4].buffer = &v.v4;
+  params[4].length = &params[4].buffer_length;
+  params[4].is_null = NULL;
+
+  params[5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+  params[5].buffer_length = sizeof(v.v8);
+  params[5].buffer = &v.v8;
+  params[5].length = &params[5].buffer_length;
+  params[5].is_null = NULL;
+
+  params[6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+  params[6].buffer_length = sizeof(v.f4);
+  params[6].buffer = &v.f4;
+  params[6].length = &params[6].buffer_length;
+  params[6].is_null = NULL;
+
+  params[7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+  params[7].buffer_length = sizeof(v.f8);
+  params[7].buffer = &v.f8;
+  params[7].length = &params[7].buffer_length;
+  params[7].is_null = NULL;
+
+  params[8].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[8].buffer_length = sizeof(v.bin);
+  params[8].buffer = v.bin;
+  params[8].length = &params[8].buffer_length;
+  params[8].is_null = NULL;
+
+  params[9].buffer_type = TSDB_DATA_TYPE_BINARY;
+  params[9].buffer_length = sizeof(v.bin);
+  params[9].buffer = v.bin;
+  params[9].length = &params[9].buffer_length;
+  params[9].is_null = NULL;
+
+  int is_null = 1;
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  for (int l = 0; l < 100; l++) {
+    for (int zz = 0; zz < 10; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+      v.ts = 1591060628000 + zz * 100 * l;
+      for (int i = 0; i < zz; ++i) {
+        v.ts += 1;
+        for (int j = 1; j < 10; ++j) {
+          params[j].is_null = ((i == j) ? &is_null : 0);
+        }
+        v.b = (int8_t)(i+zz*10) % 2;
+        v.v1 = (int8_t)(i+zz*10);
+        v.v2 = (int16_t)((i+zz*10) * 2);
+        v.v4 = (int32_t)((i+zz*10) * 4);
+        v.v8 = (int64_t)((i+zz*10) * 8);
+        v.f4 = (float)((i+zz*10) * 40);
+        v.f8 = (double)((i+zz*10) * 80);
+        for (int j = 0; j < sizeof(v.bin) - 1; ++j) {
+          v.bin[j] = (char)((i+zz)%10 + '0');
+        }
+
+        taos_stmt_bind_param(stmt, params);
+        taos_stmt_add_batch(stmt);
+      }
+    }
+  }
+
+  
+  if (taos_stmt_execute(stmt) != 0) {
+    printf("failed to execute insert statement.\n");
+    exit(1);
+  }
+
+
+  return 0;
+}
+
+
+//300 tables 60 records
+int stmt_funcb1(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+    }
+ 
+    if (taos_stmt_execute(stmt) != 0) {
+      printf("failed to execute insert statement.\n");
+      exit(1);
+    }
+
+    ++id;
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//1table 18000 reocrds
+int stmt_funcb2(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[18000];
+      int8_t v1[18000];
+      int16_t v2[18000];
+      int32_t v4[18000];
+      int64_t v8[18000];
+      float f4[18000];
+      double f8[18000];
+      char bin[18000][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(18000 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 3000*10);
+  int* is_null = malloc(sizeof(int) * 18000);
+  int* no_null = malloc(sizeof(int) * 18000);
+
+  for (int i = 0; i < 18000; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 30000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[18000*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 18000;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 18000;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 18000;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 18000;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 18000;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 18000;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 18000;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 18000;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 18000;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 18000;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 10; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+
+      if (taos_stmt_execute(stmt) != 0) {
+        printf("failed to execute insert statement.\n");
+        exit(1);
+      }
+      ++id;
+
+    }
+ 
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//disorder
+int stmt_funcb3(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  int64_t ttt = 0;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+    if (i > 0 && i%60 == 0) {
+      ttt = v.ts[i-1];
+      v.ts[i-1] = v.ts[i-60];
+      v.ts[i-60] = ttt;
+    }
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+    }
+ 
+    if (taos_stmt_execute(stmt) != 0) {
+      printf("failed to execute insert statement.\n");
+      exit(1);
+    }
+
+    ++id;
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+
+
+//samets
+int stmt_funcb4(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+    }
+ 
+    if (taos_stmt_execute(stmt) != 0) {
+      printf("failed to execute insert statement.\n");
+      exit(1);
+    }
+
+    ++id;
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+
+
+//1table 18000 reocrds
+int stmt_funcb5(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[18000];
+      int8_t v1[18000];
+      int16_t v2[18000];
+      int32_t v4[18000];
+      int64_t v8[18000];
+      float f4[18000];
+      double f8[18000];
+      char bin[18000][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(18000 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 3000*10);
+  int* is_null = malloc(sizeof(int) * 18000);
+  int* no_null = malloc(sizeof(int) * 18000);
+
+  for (int i = 0; i < 18000; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 30000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[18000*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 18000;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 18000;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 18000;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 18000;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 18000;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 18000;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 18000;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 18000;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 18000;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 18000;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into m0 values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 10; l++) {
+    for (int zz = 0; zz < 1; zz++) {
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+
+      if (taos_stmt_execute(stmt) != 0) {
+        printf("failed to execute insert statement.\n");
+        exit(1);
+      }
+      ++id;
+
+    }
+ 
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//1table 200000 reocrds
+int stmt_funcb_ssz1(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int b[30000];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 30000 * 3000);
+  
+  uintptr_t *lb = malloc(30000 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 3000*10);
+  int* no_null = malloc(sizeof(int) * 200000);
+
+  for (int i = 0; i < 30000; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    v.b[i] = (int8_t)(i % 2);
+  }
+  
+  for (int i = 0; i < 30000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[30000*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 30000;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+1].buffer_length = sizeof(int);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = no_null;
+    params[i+1].num = 30000;
+  }
+
+  int64_t tts = 0;
+  for (int64_t i = 0; i < 90000000LL; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 10; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+
+      if (taos_stmt_execute(stmt) != 0) {
+        printf("failed to execute insert statement.\n");
+        exit(1);
+      }
+      ++id;
+
+    }
+ 
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//one table 60 records one time
+int stmt_funcb_s1(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      taos_stmt_bind_param_batch(stmt, params + id * 10);
+      taos_stmt_add_batch(stmt);
+
+      if (taos_stmt_execute(stmt) != 0) {
+        printf("failed to execute insert statement.\n");
+        exit(1);
+      }
+      
+      ++id;
+    }
+ 
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+
+
+
+
+//300 tables 60 records single column bind
+int stmt_funcb_sc1(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      for (int col=0; col < 10; ++col) {
+        taos_stmt_bind_single_param_batch(stmt, params + id++, col);
+      }
+      
+      taos_stmt_add_batch(stmt);
+    }
+ 
+    if (taos_stmt_execute(stmt) != 0) {
+      printf("failed to execute insert statement.\n");
+      exit(1);
+    }
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//1 tables 60 records single column bind
+int stmt_funcb_sc2(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 900000 * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 900000*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+  
+  for (int i = 0; i < 9000000; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[60*i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = 60;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = 60;
+
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = 60;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = 60;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = 60;
+
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = 60;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = 60;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = 60;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = 60;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = 60;
+    
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 54000000; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int l = 0; l < 3000; l++) {
+    for (int zz = 0; zz < 300; zz++) {
+      char buf[32];
+      sprintf(buf, "m%d", zz);
+      code = taos_stmt_set_tbname(stmt, buf);
+      if (code != 0){
+        printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+      }  
+
+      for (int col=0; col < 10; ++col) {
+        taos_stmt_bind_single_param_batch(stmt, params + id++, col);
+      }
+      
+      taos_stmt_add_batch(stmt);
+
+      if (taos_stmt_execute(stmt) != 0) {
+        printf("failed to execute insert statement.\n");
+        exit(1);
+      }
+
+    }
+ 
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+//10 tables [1...10] records single column bind
+int stmt_funcb_sc3(TAOS_STMT *stmt) {
+  struct {
+      int64_t *ts;
+      int8_t b[60];
+      int8_t v1[60];
+      int16_t v2[60];
+      int32_t v4[60];
+      int64_t v8[60];
+      float f4[60];
+      double f8[60];
+      char bin[60][40];
+  } v = {0};
+
+  v.ts = malloc(sizeof(int64_t) * 60);
+  
+  uintptr_t *lb = malloc(60 * sizeof(uintptr_t));
+  
+  TAOS_MULTI_BIND *params = calloc(1, sizeof(TAOS_MULTI_BIND) * 60*10);
+  int* is_null = malloc(sizeof(int) * 60);
+  int* no_null = malloc(sizeof(int) * 60);
+
+  for (int i = 0; i < 60; ++i) {
+    lb[i] = 40;
+    no_null[i] = 0;
+    is_null[i] = (i % 10 == 2) ? 1 : 0;
+    v.b[i] = (int8_t)(i % 2);
+    v.v1[i] = (int8_t)((i+1) % 2);
+    v.v2[i] = (int16_t)i;
+    v.v4[i] = (int32_t)(i+1);
+    v.v8[i] = (int64_t)(i+2);
+    v.f4[i] = (float)(i+3);
+    v.f8[i] = (double)(i+4);
+    memset(v.bin[i], '0'+i%10, 40);
+  }
+
+  int g = 0;
+  for (int i = 0; i < 600; i+=10) {
+    params[i+0].buffer_type = TSDB_DATA_TYPE_TIMESTAMP;
+    params[i+0].buffer_length = sizeof(int64_t);
+    params[i+0].buffer = &v.ts[i/10];
+    params[i+0].length = NULL;
+    params[i+0].is_null = no_null;
+    params[i+0].num = g%10+1;
+    
+    params[i+1].buffer_type = TSDB_DATA_TYPE_BOOL;
+    params[i+1].buffer_length = sizeof(int8_t);
+    params[i+1].buffer = v.b;
+    params[i+1].length = NULL;
+    params[i+1].is_null = is_null;
+    params[i+1].num = g%10+1;
+    
+    params[i+2].buffer_type = TSDB_DATA_TYPE_TINYINT;
+    params[i+2].buffer_length = sizeof(int8_t);
+    params[i+2].buffer = v.v1;
+    params[i+2].length = NULL;
+    params[i+2].is_null = is_null;
+    params[i+2].num = g%10+1;
+
+    params[i+3].buffer_type = TSDB_DATA_TYPE_SMALLINT;
+    params[i+3].buffer_length = sizeof(int16_t);
+    params[i+3].buffer = v.v2;
+    params[i+3].length = NULL;
+    params[i+3].is_null = is_null;
+    params[i+3].num = g%10+1;
+
+    params[i+4].buffer_type = TSDB_DATA_TYPE_INT;
+    params[i+4].buffer_length = sizeof(int32_t);
+    params[i+4].buffer = v.v4;
+    params[i+4].length = NULL;
+    params[i+4].is_null = is_null;
+    params[i+4].num = g%10+1;
+    
+    params[i+5].buffer_type = TSDB_DATA_TYPE_BIGINT;
+    params[i+5].buffer_length = sizeof(int64_t);
+    params[i+5].buffer = v.v8;
+    params[i+5].length = NULL;
+    params[i+5].is_null = is_null;
+    params[i+5].num = g%10+1;
+
+    params[i+6].buffer_type = TSDB_DATA_TYPE_FLOAT;
+    params[i+6].buffer_length = sizeof(float);
+    params[i+6].buffer = v.f4;
+    params[i+6].length = NULL;
+    params[i+6].is_null = is_null;
+    params[i+6].num = g%10+1;
+
+    params[i+7].buffer_type = TSDB_DATA_TYPE_DOUBLE;
+    params[i+7].buffer_length = sizeof(double);
+    params[i+7].buffer = v.f8;
+    params[i+7].length = NULL;
+    params[i+7].is_null = is_null;
+    params[i+7].num = g%10+1;
+
+    params[i+8].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+8].buffer_length = 40;
+    params[i+8].buffer = v.bin;
+    params[i+8].length = lb;
+    params[i+8].is_null = is_null;
+    params[i+8].num = g%10+1;
+
+    params[i+9].buffer_type = TSDB_DATA_TYPE_BINARY;
+    params[i+9].buffer_length = 40;
+    params[i+9].buffer = v.bin;
+    params[i+9].length = lb;
+    params[i+9].is_null = is_null;
+    params[i+9].num = g%10+1;
+    ++g;
+  }
+
+  int64_t tts = 1591060628000;
+  for (int i = 0; i < 60; ++i) {
+    v.ts[i] = tts + i;
+  }
+
+  unsigned long long starttime = getCurrentTime();
+
+  char *sql = "insert into ? values(?,?,?,?,?,?,?,?,?,?)";
+  int code = taos_stmt_prepare(stmt, sql, 0);
+  if (code != 0){
+    printf("failed to execute taos_stmt_prepare. code:0x%x\n", code);
+  }
+
+  int id = 0;
+  for (int zz = 0; zz < 10; zz++) {
+    char buf[32];
+    sprintf(buf, "m%d", zz);
+    code = taos_stmt_set_tbname(stmt, buf);
+    if (code != 0){
+      printf("failed to execute taos_stmt_set_tbname. code:0x%x\n", code);
+    }  
+
+    for (int col=0; col < 10; ++col) {
+      taos_stmt_bind_single_param_batch(stmt, params + id++, col);
+    }
+    
+    taos_stmt_add_batch(stmt);
+  }
+
+  if (taos_stmt_execute(stmt) != 0) {
+    printf("failed to execute insert statement.\n");
+    exit(1);
+  }
+
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%u useconds\n", 3000*300*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*300*60));
+
+  return 0;
+}
+
+
+void check_result(TAOS     *taos, char *tname, int printr, int expected) {
+  char sql[255] = "SELECT * FROM ";
+  TAOS_RES *result;
+
+  strcat(sql, tname);
+
+  result = taos_query(taos, sql);
+  int code = taos_errno(result);
+  if (code != 0) {
+    printf("failed to query table, reason:%s\n", taos_errstr(result));
+    taos_free_result(result);
+    exit(1);
+  }
+
+
+  TAOS_ROW    row;
+  int         rows = 0;
+  int         num_fields = taos_num_fields(result);
+  TAOS_FIELD *fields = taos_fetch_fields(result);
+  char        temp[256];
+
+  // fetch the records row by row
+  while ((row = taos_fetch_row(result))) {
+    rows++;
+    if (printr) {
+      memset(temp, 0, sizeof(temp));
+      taos_print_row(temp, row, fields, num_fields);
+      printf("[%s]\n", temp);
+    }
+  }
+  
+  if (rows == expected) {
+    printf("%d rows are fetched as expectation\n", rows);
+  } else {
+    printf("!!!expect %d rows, but %d rows are fetched\n", expected, rows);
+    exit(1);
+  }
+
+  taos_free_result(result);
+
+}
+
+
+
+//120table 60 record each table
+int sql_perf1(TAOS     *taos) {
+  char *sql[3000] = {0};
+  TAOS_RES *result;
+
+  for (int i = 0; i < 3000; i++) {
+    sql[i] = calloc(1, 1048576);
+  }
+
+  int len = 0;
+  int tss = 0;
+  for (int l = 0; l < 3000; ++l) {
+    len = sprintf(sql[l], "insert into ");
+    for (int t = 0; t < 120; ++t) {
+      len += sprintf(sql[l] + len, "m%d values ", t);
+      for (int m = 0; m < 60; ++m) {
+        len += sprintf(sql[l] + len, "(%d, %d, %d, %d, %d, %d, %f, %f, \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\", \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\") ", tss++, m, m, m, m, m, m+1.0, m+1.0);
+      }
+    }
+  }
+
+
+  unsigned long long starttime = getCurrentTime();
+  for (int i = 0; i < 3000; ++i) {
+      result = taos_query(taos, sql[i]);
+      int code = taos_errno(result);
+      if (code != 0) {
+        printf("failed to query table, reason:%s\n", taos_errstr(result));
+        taos_free_result(result);
+        exit(1);
+    }
+
+    taos_free_result(result);
+  }
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%.1f useconds\n", 3000*120*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*120*60));
+
+  return 0;
+}
+
+
+
+
+
+//one table 60 records one time
+int sql_perf_s1(TAOS     *taos) {
+  char **sql = calloc(1, sizeof(char*) * 360000);
+  TAOS_RES *result;
+
+  for (int i = 0; i < 360000; i++) {
+    sql[i] = calloc(1, 9000);
+  }
+
+  int len = 0;
+  int tss = 0;
+  int id = 0;
+  for (int t = 0; t < 120; ++t) {
+    for (int l = 0; l < 3000; ++l) {
+      len = sprintf(sql[id], "insert into m%d values ", t);
+      for (int m = 0; m < 60; ++m) {
+        len += sprintf(sql[id] + len, "(%d, %d, %d, %d, %d, %d, %f, %f, \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\", \"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\") ", tss++, m, m, m, m, m, m+1.0, m+1.0);
+      }
+      if (len >= 9000) {
+        printf("sql:%s,len:%d\n", sql[id], len);
+        exit(1);
+      }
+      ++id;
+    }
+  }
+
+
+  unsigned long long starttime = getCurrentTime();
+  for (int i = 0; i < 360000; ++i) {
+      result = taos_query(taos, sql[i]);
+      int code = taos_errno(result);
+      if (code != 0) {
+        printf("failed to query table, reason:%s\n", taos_errstr(result));
+        taos_free_result(result);
+        exit(1);
+    }
+
+    taos_free_result(result);
+  }
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%.1f useconds\n", 3000*120*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*120*60));
+
+  return 0;
+}
+
+
+//small record size
+int sql_s_perf1(TAOS     *taos) {
+  char *sql[3000] = {0};
+  TAOS_RES *result;
+
+  for (int i = 0; i < 3000; i++) {
+    sql[i] = calloc(1, 1048576);
+  }
+
+  int len = 0;
+  int tss = 0;
+  for (int l = 0; l < 3000; ++l) {
+    len = sprintf(sql[l], "insert into ");
+    for (int t = 0; t < 120; ++t) {
+      len += sprintf(sql[l] + len, "m%d values ", t);
+      for (int m = 0; m < 60; ++m) {
+        len += sprintf(sql[l] + len, "(%d, %d) ", tss++, m%2);
+      }
+    }
+  }
+
+
+  unsigned long long starttime = getCurrentTime();
+  for (int i = 0; i < 3000; ++i) {
+      result = taos_query(taos, sql[i]);
+      int code = taos_errno(result);
+      if (code != 0) {
+        printf("failed to query table, reason:%s\n", taos_errstr(result));
+        taos_free_result(result);
+        exit(1);
+    }
+
+    taos_free_result(result);
+  }
+  unsigned long long endtime = getCurrentTime();
+  printf("insert total %d records, used %u seconds, avg:%.1f useconds\n", 3000*120*60, (endtime-starttime)/1000000UL, (endtime-starttime)/(3000*120*60));
+
+  return 0;
+}
+
+
+void prepare(TAOS     *taos, int bigsize) {
+  TAOS_RES *result;
+  int      code;
+
+  result = taos_query(taos, "drop database demo"); 
+  taos_free_result(result);
+
+  result = taos_query(taos, "create database demo");
+  code = taos_errno(result);
+  if (code != 0) {
+    printf("failed to create database, reason:%s\n", taos_errstr(result));
+    taos_free_result(result);
+    exit(1);
+  }
+  taos_free_result(result);
+
+  result = taos_query(taos, "use demo");
+  taos_free_result(result);
+  
+  // create table
+  for (int i = 0 ; i < 300; i++) {
+    char buf[1024];
+    if (bigsize) {
+      sprintf(buf, "create table m%d (ts timestamp, b bool, v1 tinyint, v2 smallint, v4 int, v8 bigint, f4 float, f8 double, bin binary(40), bin2 binary(40))", i) ;
+    } else {
+      sprintf(buf, "create table m%d (ts timestamp, b int)", i) ;
+    }
+    result = taos_query(taos, buf);
+    code = taos_errno(result);
+    if (code != 0) {
+      printf("failed to create table, reason:%s\n", taos_errstr(result));
+      taos_free_result(result);
+      exit(1);
+    }
+    taos_free_result(result);
+  }
+
+}
+
+
+
+void preparem(TAOS     *taos, int bigsize, int idx) {
+  TAOS_RES *result;
+  int      code;
+  char dbname[32],sql[255];
+
+  sprintf(dbname, "demo%d", idx);
+  sprintf(sql, "drop database %s", dbname);
+  
+
+  result = taos_query(taos, sql); 
+  taos_free_result(result);
+
+  sprintf(sql, "create database %s", dbname);
+  result = taos_query(taos, sql);
+  code = taos_errno(result);
+  if (code != 0) {
+    printf("failed to create database, reason:%s\n", taos_errstr(result));
+    taos_free_result(result);
+    exit(1);
+  }
+  taos_free_result(result);
+
+  sprintf(sql, "use %s", dbname);
+  result = taos_query(taos, sql);
+  taos_free_result(result);
+  
+  // create table
+  for (int i = 0 ; i < 300; i++) {
+    char buf[1024];
+    if (bigsize) {
+      sprintf(buf, "create table m%d (ts timestamp, b bool, v1 tinyint, v2 smallint, v4 int, v8 bigint, f4 float, f8 double, bin binary(40), bin2 binary(40))", i) ;
+    } else {
+      sprintf(buf, "create table m%d (ts timestamp, b int)", i) ;
+    }
+    result = taos_query(taos, buf);
+    code = taos_errno(result);
+    if (code != 0) {
+      printf("failed to create table, reason:%s\n", taos_errstr(result));
+      taos_free_result(result);
+      exit(1);
+    }
+    taos_free_result(result);
+  }
+
+}
+
+
+
+//void runcase(TAOS     *taos, int idx) {
+void* runcase(void *par) {
+  T_par* tpar = (T_par *)par;
+  TAOS *taos = tpar->taos;
+  int idx = tpar->idx;
+  
+  TAOS_STMT *stmt;
+
+  (void)idx;
+
+
+#if 1
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("10t+10records start\n");
+  stmt_func1(stmt);
+  printf("10t+10records end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 1, 10);
+  check_result(taos, "m1", 1, 10);
+  check_result(taos, "m2", 1, 10);
+  check_result(taos, "m3", 1, 10);
+  check_result(taos, "m4", 1, 10);
+  check_result(taos, "m5", 1, 10);
+  check_result(taos, "m6", 1, 10);
+  check_result(taos, "m7", 1, 10);
+  check_result(taos, "m8", 1, 10);
+  check_result(taos, "m9", 1, 10);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+  
+#endif
+
+#if 1
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("10t+[0,1,2...9]records start\n");
+  stmt_func2(stmt);
+  printf("10t+[0,1,2...9]records end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 0);
+  check_result(taos, "m1", 0, 100);
+  check_result(taos, "m2", 0, 200);
+  check_result(taos, "m3", 0, 300);
+  check_result(taos, "m4", 0, 400);
+  check_result(taos, "m5", 0, 500);
+  check_result(taos, "m6", 0, 600);
+  check_result(taos, "m7", 0, 700);
+  check_result(taos, "m8", 0, 800);
+  check_result(taos, "m9", 0, 900);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+  
+#endif
+
+#if 1
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("10t+[0,100,200...900]records start\n");
+  stmt_func3(stmt);
+  printf("10t+[0,100,200...900]records end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 0);
+  check_result(taos, "m1", 0, 100);
+  check_result(taos, "m2", 0, 200);
+  check_result(taos, "m3", 0, 300);
+  check_result(taos, "m4", 0, 400);
+  check_result(taos, "m5", 0, 500);
+  check_result(taos, "m6", 0, 600);
+  check_result(taos, "m7", 0, 700);
+  check_result(taos, "m8", 0, 800);
+  check_result(taos, "m9", 0, 900);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+  
+#endif
+
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("300t+60r+bm start\n");
+  stmt_funcb1(stmt);
+  printf("300t+60r+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+#endif
+
+
+#if 1
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+18000r+bm start\n");
+  stmt_funcb2(stmt);
+  printf("1t+18000r+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("300t+60r+disorder+bm start\n");
+  stmt_funcb3(stmt);
+  printf("300t+60r+disorder+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("300t+60r+samets+bm start\n");
+  stmt_funcb4(stmt);
+  printf("300t+60r+samets+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 1);
+  check_result(taos, "m1", 0, 1);
+  check_result(taos, "m111", 0, 1);  
+  check_result(taos, "m223", 0, 1);
+  check_result(taos, "m299", 0, 1);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+#endif
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+18000r+nodyntable+bm start\n");
+  stmt_funcb5(stmt);
+  printf("1t+18000r+nodyntable+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+
+#if 1 
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("300t+60r+bm+sc start\n");
+  stmt_funcb_sc1(stmt);
+  printf("300t+60r+bm+sc end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+#endif
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+60r+bm+sc start\n");
+  stmt_funcb_sc2(stmt);
+  printf("1t+60r+bm+sc end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+#if 1  
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("10t+[1...10]r+bm+sc start\n");
+  stmt_funcb_sc3(stmt);
+  printf("10t+[1...10]r+bm+sc end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 1, 1);
+  check_result(taos, "m1", 1, 2);
+  check_result(taos, "m2", 1, 3);
+  check_result(taos, "m3", 1, 4);
+  check_result(taos, "m4", 1, 5);
+  check_result(taos, "m5", 1, 6);
+  check_result(taos, "m6", 1, 7);
+  check_result(taos, "m7", 1, 8);
+  check_result(taos, "m8", 1, 9);
+  check_result(taos, "m9", 1, 10);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+
+#if 1 
+  prepare(taos, 1);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+60r+bm start\n");
+  stmt_funcb_s1(stmt);
+  printf("1t+60r+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m111", 0, 180000);  
+  check_result(taos, "m223", 0, 180000);
+  check_result(taos, "m299", 0, 180000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+
+#if 1
+  prepare(taos, 1);
+
+  (void)stmt;
+  printf("120t+60r+sql start\n");
+  sql_perf1(taos);
+  printf("120t+60r+sql end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m34", 0, 180000);  
+  check_result(taos, "m67", 0, 180000);
+  check_result(taos, "m99", 0, 180000);
+  printf("check result end\n");
+#endif  
+
+#if 1
+  prepare(taos, 1);
+
+  (void)stmt;
+  printf("1t+60r+sql start\n");
+  sql_perf_s1(taos);
+  printf("1t+60r+sql end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 180000);
+  check_result(taos, "m1", 0, 180000);
+  check_result(taos, "m34", 0, 180000);  
+  check_result(taos, "m67", 0, 180000);
+  check_result(taos, "m99", 0, 180000);
+  printf("check result end\n");
+#endif  
+
+
+#if 1 
+  preparem(taos, 0, idx);
+
+  stmt = taos_stmt_init(taos);
+
+  printf("1t+30000r+bm start\n");
+  stmt_funcb_ssz1(stmt);
+  printf("1t+30000r+bm end\n");
+  printf("check result start\n");
+  check_result(taos, "m0", 0, 300000);
+  check_result(taos, "m1", 0, 300000);
+  check_result(taos, "m111", 0, 300000);  
+  check_result(taos, "m223", 0, 300000);
+  check_result(taos, "m299", 0, 300000);
+  printf("check result end\n");
+  taos_stmt_close(stmt);
+
+#endif
+
+  return NULL;
+
+}
+
+int main(int argc, char *argv[])
+{
+  TAOS     *taos[4];
+
+  // connect to server
+  if (argc < 2) {
+    printf("please input server ip \n");
+    return 0;
+  }
+
+  taos[0] = taos_connect(argv[1], "root", "taosdata", NULL, 0);
+  if (taos == NULL) {
+    printf("failed to connect to db, reason:%s\n", taos_errstr(taos));
+    exit(1);
+  }   
+
+  taos[1] = taos_connect(argv[1], "root", "taosdata", NULL, 0);
+  if (taos == NULL) {
+    printf("failed to connect to db, reason:%s\n", taos_errstr(taos));
+    exit(1);
+  }   
+
+  taos[2] = taos_connect(argv[1], "root", "taosdata", NULL, 0);
+  if (taos == NULL) {
+    printf("failed to connect to db, reason:%s\n", taos_errstr(taos));
+    exit(1);
+  }   
+
+  taos[3] = taos_connect(argv[1], "root", "taosdata", NULL, 0);
+  if (taos == NULL) {
+    printf("failed to connect to db, reason:%s\n", taos_errstr(taos));
+    exit(1);
+  }     
+
+  pthread_t *pThreadList = (pthread_t *) calloc(sizeof(pthread_t), 4);
+
+  pthread_attr_t thattr;
+  pthread_attr_init(&thattr);
+  pthread_attr_setdetachstate(&thattr, PTHREAD_CREATE_JOINABLE);
+  T_par par[4];
+
+  par[0].taos = taos[0];
+  par[0].idx = 0;
+  par[1].taos = taos[1];
+  par[1].idx = 1;
+  par[2].taos = taos[2];
+  par[2].idx = 2;
+  par[3].taos = taos[3];
+  par[3].idx = 3;
+  
+  pthread_create(&(pThreadList[0]), &thattr, runcase, (void *)&par[0]);
+  //pthread_create(&(pThreadList[1]), &thattr, runcase, (void *)&par[1]);
+  //pthread_create(&(pThreadList[2]), &thattr, runcase, (void *)&par[2]);
+  //pthread_create(&(pThreadList[3]), &thattr, runcase, (void *)&par[3]);
+
+  while(1) {
+    sleep(1);
+  }
+  return 0;
+}
+
diff --git a/tests/script/api/makefile b/tests/script/api/makefile
new file mode 100644
index 0000000000000000000000000000000000000000..c5bbde0f0be02a4c423eccee3fb3476981e9ac59
--- /dev/null
+++ b/tests/script/api/makefile
@@ -0,0 +1,17 @@
+# Copyright (c) 2017 by TAOS Technologies, Inc.
+# todo: library dependency, header file dependency
+
+ROOT=./
+TARGET=exe
+LFLAGS = '-Wl,-rpath,/usr/local/taos/driver/' -ltaos -lpthread -lm -lrt
+CFLAGS = -O0 -g -Wall -Wno-deprecated -fPIC -Wno-unused-result -Wconversion \
+	-Wno-char-subscripts -D_REENTRANT -Wno-format -D_REENTRANT -DLINUX \
+	-Wno-unused-function -D_M_X64 -I/usr/local/taos/include -std=gnu99
+
+all: $(TARGET)
+
+exe:
+	gcc $(CFLAGS) ./batchprepare.c -o $(ROOT)batchprepare $(LFLAGS)
+
+clean:
+	rm $(ROOT)batchprepare