diff --git a/include/common/taosmsg.h b/include/common/taosmsg.h
index a75c4a7bac9555af40f667442eb45c12974c5e88..caf872689c2117c74efcf2c61782a8291a9fa8b8 100644
--- a/include/common/taosmsg.h
+++ b/include/common/taosmsg.h
@@ -219,6 +219,13 @@ typedef struct SBuildTableMetaInput {
   char     *tableFullName;
 } SBuildTableMetaInput;
 
+typedef struct SBuildUseDBInput {
+  char    db[TSDB_TABLE_FNAME_LEN];
+  int32_t vgroupVersion;
+  int32_t dbGroupVersion;
+} SBuildUseDBInput;
+
+
 #pragma pack(push, 1)
 
 // null-terminated string instead of char array to avoid too many memory consumption in case of more than 1M tableMeta
@@ -617,9 +624,12 @@ typedef struct {
 typedef struct {
   char    db[TSDB_TABLE_FNAME_LEN];
   int8_t  ignoreNotExists;
+  int32_t vgroupVersion;
+  int32_t dbGroupVersion;
   int32_t reserve[8];
 } SUseDbMsg;
 
+
 typedef struct {
   char    db[TSDB_TABLE_FNAME_LEN];
   int32_t reserve[8];
@@ -806,8 +816,6 @@ typedef struct SVgroupListRspMsg {
   SVgroupInfo vgroupInfo[];
 } SVgroupListRspMsg;
 
-typedef SVgroupListRspMsg SVgroupListInfo;
-
 typedef struct {
   int32_t    vgId;
   int8_t     numOfEps;
@@ -852,6 +860,19 @@ typedef struct {
   char   *data;
 } STagData;
 
+typedef struct {
+  int32_t     vgroupNum;
+  int32_t     vgroupVersion;
+  char        db[TSDB_TABLE_FNAME_LEN];
+  int32_t     dbVgroupVersion;
+  int32_t     dbVgroupNum;
+  int32_t     dbHashRange;
+  SVgroupInfo vgroupInfo[];
+//int32_t     vgIdList[];
+} SUseDbRspMsg;
+
+
+
 /*
  * sql: show tables like '%a_%'
  * payload is the query condition, e.g., '%a_%'
diff --git a/include/libs/catalog/catalog.h b/include/libs/catalog/catalog.h
index 0b45f715574f0621bd0d093e57fa8ac382d3597c..f9d3b3c8c18c627df6decfbca87e969aa759fe27 100644
--- a/include/libs/catalog/catalog.h
+++ b/include/libs/catalog/catalog.h
@@ -27,16 +27,10 @@ extern "C" {
 #include "transport.h"
 #include "common.h"
 #include "taosmsg.h"
+#include "query.h"
 
 struct SCatalog;
 
-typedef struct SDBVgroupInfo {
-  int32_t vgroupVersion;
-  SArray *vgId;
-  int32_t hashRange;
-  int32_t hashNum;
-} SDBVgroupInfo;
-
 typedef struct SCatalogReq {
   char    clusterId[TSDB_CLUSTER_ID_LEN];  //????
   SArray *pTableName;     // table full name
diff --git a/include/libs/query/query.h b/include/libs/query/query.h
index 866a69ed8e72378b7937d5ef46ef730c9ce4d5ee..02ae70887484428710cd224ae389b0de8b18c9bf 100644
--- a/include/libs/query/query.h
+++ b/include/libs/query/query.h
@@ -20,6 +20,22 @@
 extern "C" {
 #endif
 
+#include "tarray.h"
+
+typedef SVgroupListRspMsg SVgroupListInfo;
+
+typedef struct SDBVgroupInfo {
+  int32_t vgroupVersion;
+  SArray *vgId;
+  int32_t hashRange;
+} SDBVgroupInfo;
+
+typedef struct SUseDbOutput {
+  SVgroupListInfo *vgroupList;
+  char db[TSDB_TABLE_FNAME_LEN];
+  SDBVgroupInfo *dbVgroup;
+} SUseDbOutput;
+
 
 extern int32_t (*queryBuildMsg[TSDB_MSG_TYPE_MAX])(void* input, char **msg, int32_t msgSize, int32_t *msgLen);
 extern int32_t (*queryProcessMsgRsp[TSDB_MSG_TYPE_MAX])(void* output, char *msg, int32_t msgSize);
diff --git a/include/os/osMemory.h b/include/os/osMemory.h
index 10c90cd9aaf13ba073b7124fd046b8d5c5e7b6ba..5f1d5a9a8a6a7028295cac28d6711f6171be7307 100644
--- a/include/os/osMemory.h
+++ b/include/os/osMemory.h
@@ -23,8 +23,8 @@ extern "C" {
 #define tfree(x)       \
   do {                 \
     if (x) {           \
-      free((void *)x); \
-      x = 0;           \
+      free((void *)(x)); \
+      (x) = 0;           \
     }                  \
   } while (0)
 
diff --git a/source/libs/catalog/inc/catalogInt.h b/source/libs/catalog/inc/catalogInt.h
index 720f197782f7ee59dbe525d9cc9d1f5733dde71c..a08b64f9a91b8db5b16bfae330dab3dd9b9388c8 100644
--- a/source/libs/catalog/inc/catalogInt.h
+++ b/source/libs/catalog/inc/catalogInt.h
@@ -26,6 +26,7 @@ extern "C" {
 
 #define CTG_DEFAULT_CLUSTER_NUMBER 6
 #define CTG_DEFAULT_VGROUP_NUMBER 100
+#define CTG_DEFAULT_DB_NUMBER 20
 
 #define CTG_DEFAULT_INVALID_VERSION (-1)
 
diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index b488ab8101c49d6d446fc625bb16e6ed564914a2..92b60945291184afc39c151b6d7067acef8c8192 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -63,21 +63,69 @@ int32_t ctgGetVgroupFromCache(SCatalog* pCatalog, SArray** pVgroupList, int32_t*
 }
 
 
-int32_t ctgGetDBVgroupFromCache(SCatalog* pCatalog, char *dbName, SDBVgroupInfo **dbInfo, int32_t *exist) {
-/*
+int32_t ctgGetDBVgroupFromCache(SCatalog* pCatalog, const char *dbName, SDBVgroupInfo **dbInfo, int32_t *exist) {
   if (NULL == pCatalog->dbCache.cache) {
     *exist = 0;
     return TSDB_CODE_SUCCESS;
   }
 
-  taosHashGet(SHashObj * pHashObj, const void * key, size_t keyLen)
+  SDBVgroupInfo *info = taosHashGet(pCatalog->dbCache.cache, dbName, strlen(dbName));
+
+  if (NULL == info || info->vgroupVersion < pCatalog->vgroupCache.vgroupVersion) {
+    *exist = 0;
+    return TSDB_CODE_SUCCESS;
+  }
 
   if (dbInfo) {
-    *pVgroupList = taosArrayDup(pCatalog->vgroupCache.arrayCache);
+    *dbInfo = calloc(1, sizeof(**dbInfo));
+    if (NULL == *dbInfo) {
+      ctgError("calloc size[%d] failed", (int32_t)sizeof(**dbInfo));
+      return TSDB_CODE_CTG_MEM_ERROR;
+    }
+    
+    (*dbInfo)->vgId = taosArrayDup(info->vgId);
+    if (NULL == (*dbInfo)->vgId) {
+      ctgError("taos array duplicate failed");
+      tfree(*dbInfo);
+      return TSDB_CODE_CTG_MEM_ERROR;
+    }
+
+    (*dbInfo)->vgroupVersion = info->vgroupVersion;
+    (*dbInfo)->hashRange = info->hashRange;
   }
 
   *exist = 1;
-*/  
+  
+  return TSDB_CODE_SUCCESS;
+}
+
+
+
+int32_t ctgGetDBVgroupFromMnode(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, SBuildUseDBInput *input, SUseDbOutput *out) {
+  char *msg = NULL;
+  SEpSet *pVnodeEpSet = NULL;
+  int32_t msgLen = 0;
+
+  int32_t code = queryBuildMsg[TSDB_MSG_TYPE_USE_DB](input, &msg, 0, &msgLen);
+  if (code) {
+    return code;
+  }
+
+  SRpcMsg rpcMsg = {
+      .msgType = TSDB_MSG_TYPE_USE_DB,
+      .pCont   = msg,
+      .contLen = msgLen,
+  };
+
+  SRpcMsg rpcRsp = {0};
+
+  rpcSendRecv(pRpc, (SEpSet*)pMgmtEps, &rpcMsg, &rpcRsp);
+
+  code = queryProcessMsgRsp[TSDB_MSG_TYPE_USE_DB](out, rpcRsp.pCont, rpcRsp.contLen);
+  if (code) {
+    return code;
+  }
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -144,7 +192,7 @@ int32_t catalogGetVgroupVersion(struct SCatalog* pCatalog, int32_t* version) {
 
 int32_t catalogUpdateVgroup(struct SCatalog* pCatalog, SVgroupListInfo* pVgroup) {
   if (NULL == pVgroup) {
-    ctgError("vgroup get from mnode succeed, but no output");
+    ctgError("no valid vgroup list info to update");
     return TSDB_CODE_CTG_INTERNAL_ERROR;
   }
 
@@ -262,7 +310,33 @@ int32_t catalogGetDBVgroupVersion(struct SCatalog* pCatalog, const char* dbName,
 }
 
 int32_t catalogUpdateDBVgroup(struct SCatalog* pCatalog, const char* dbName, SDBVgroupInfo* dbInfo) {
+  if (NULL == pCatalog || NULL == dbName || NULL == dbInfo) {
+    return TSDB_CODE_CTG_INVALID_INPUT;
+  }
+
+  if (dbInfo->vgroupVersion < 0) {
+    if (pCatalog->dbCache.cache) {
+      taosHashRemove(pCatalog->dbCache.cache, dbName, strlen(dbName));
+    }
+    
+    ctgWarn("remove db [%s] from cache", dbName);
+    return TSDB_CODE_SUCCESS;
+  }
 
+  if (NULL == pCatalog->dbCache.cache) {
+    pCatalog->dbCache.cache = taosHashInit(CTG_DEFAULT_DB_NUMBER, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_ENTRY_LOCK);
+    if (NULL == pCatalog->dbCache.cache) {
+      ctgError("init hash[%d] for db cache failed", CTG_DEFAULT_DB_NUMBER);
+      return TSDB_CODE_CTG_MEM_ERROR;
+    }
+  }
+
+  if (taosHashPut(pCatalog->dbCache.cache, dbName, strlen(dbName), dbInfo, sizeof(*dbInfo)) != 0) {
+    ctgError("push to vgroup hash cache failed");
+    return TSDB_CODE_CTG_MEM_ERROR;
+  }
+
+  return TSDB_CODE_SUCCESS;
 }
 
 
@@ -273,8 +347,8 @@ int32_t catalogGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet*
     return TSDB_CODE_CTG_INVALID_INPUT;
   }
 
-/*
   int32_t exist = 0;
+  int32_t code = 0;
 
   if (0 == forceUpdate) {
     CTG_ERR_RET(ctgGetDBVgroupFromCache(pCatalog, dbName, dbInfo, &exist));
@@ -284,18 +358,34 @@ int32_t catalogGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet*
     }
   }
 
-  SDBVgroupInfo* newDbInfo = NULL;
+  SUseDbOutput DbOut = {0};
+  SBuildUseDBInput input = {0};
+
+  strncpy(input.db, dbName, sizeof(input.db));
+  input.db[sizeof(input.db) - 1] = 0;
+  input.vgroupVersion = pCatalog->vgroupCache.vgroupVersion;
+  input.dbGroupVersion = CTG_DEFAULT_INVALID_VERSION;
   
-  CTG_ERR_RET(ctgGetDBVgroupFromMnode(pCatalog, pRpc, pMgmtEps, dbName, &newDbInfo));
+  CTG_ERR_RET(ctgGetDBVgroupFromMnode(pCatalog, pRpc, pMgmtEps, &input, &DbOut));
 
-  CTG_ERR_RET(catalogUpdateDBVgroup(pCatalog, dbName, newDbInfo));
+  if (DbOut.vgroupList) {
+    CTG_ERR_JRET(catalogUpdateVgroup(pCatalog, DbOut.vgroupList));
+  }
+
+  if (DbOut.dbVgroup) {
+    CTG_ERR_JRET(catalogUpdateDBVgroup(pCatalog, dbName, DbOut.dbVgroup));
+  }
 
   if (dbInfo) {
-    *dbInfo = newDbInfo;
+    *dbInfo = DbOut.dbVgroup;
+    DbOut.dbVgroup = NULL;
   }
-*/
 
-  return TSDB_CODE_SUCCESS;
+_return:
+  tfree(DbOut.dbVgroup);
+  tfree(DbOut.vgroupList);
+
+  return code;
 }
 
 
diff --git a/source/libs/parser/CMakeLists.txt b/source/libs/parser/CMakeLists.txt
index 155b72c1f99e7faf9ac533f23f2d98d84911e187..5e635aa6a16a1c987cbdc6932597628003df36d8 100644
--- a/source/libs/parser/CMakeLists.txt
+++ b/source/libs/parser/CMakeLists.txt
@@ -8,7 +8,7 @@ target_include_directories(
 
 target_link_libraries(
         parser
-        PRIVATE os util common catalog function transport
+        PRIVATE os util common catalog function transport query
 )
 
-ADD_SUBDIRECTORY(test)
\ No newline at end of file
+ADD_SUBDIRECTORY(test)
diff --git a/source/libs/parser/test/CMakeLists.txt b/source/libs/parser/test/CMakeLists.txt
index f7d71132434eeeb4cfb375eb959a694b43162b69..4b9e586be3409336c6a0d8c3e4a56c47685d1912 100644
--- a/source/libs/parser/test/CMakeLists.txt
+++ b/source/libs/parser/test/CMakeLists.txt
@@ -8,7 +8,7 @@ AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
 ADD_EXECUTABLE(parserTest ${SOURCE_LIST})
 TARGET_LINK_LIBRARIES(
         parserTest
-        PUBLIC os util common parser catalog transport gtest function planner
+        PUBLIC os util common parser catalog transport gtest function planner query
 )
 
 TARGET_INCLUDE_DIRECTORIES(
diff --git a/source/libs/planner/CMakeLists.txt b/source/libs/planner/CMakeLists.txt
index 23efce38f44aeee2151a985e2351c54b1b164e7b..4e0d03d07ae55ca85ddb44fc621ad8cce0056f27 100644
--- a/source/libs/planner/CMakeLists.txt
+++ b/source/libs/planner/CMakeLists.txt
@@ -8,7 +8,7 @@ target_include_directories(
 
 target_link_libraries(
     planner
-    PRIVATE os util common catalog parser transport function
+    PRIVATE os util common catalog parser transport function query
 )
 
-ADD_SUBDIRECTORY(test)
\ No newline at end of file
+ADD_SUBDIRECTORY(test)
diff --git a/source/libs/planner/test/CMakeLists.txt b/source/libs/planner/test/CMakeLists.txt
index a83d7a39d99a36fa1869dbc6874024155ef308f4..f00adfaeb25ce7ea8d1ea72b16f58ade153e7d66 100644
--- a/source/libs/planner/test/CMakeLists.txt
+++ b/source/libs/planner/test/CMakeLists.txt
@@ -8,7 +8,7 @@ AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
 ADD_EXECUTABLE(plannerTest ${SOURCE_LIST})
 TARGET_LINK_LIBRARIES(
         plannerTest
-        PUBLIC os util common planner parser catalog transport gtest function
+        PUBLIC os util common planner parser catalog transport gtest function query
 )
 
 TARGET_INCLUDE_DIRECTORIES(
diff --git a/source/libs/query/src/querymsg.c b/source/libs/query/src/querymsg.c
index 924878c872bd91f39b340aa91c5062ddfacf7a00..8f35fd9c3ef43732dfae9c19423baa91306cdc13 100644
--- a/source/libs/query/src/querymsg.c
+++ b/source/libs/query/src/querymsg.c
@@ -15,7 +15,7 @@
 
 #include "taosmsg.h"
 #include "queryInt.h"
-
+#include "query.h"
 
 int32_t (*queryBuildMsg[TSDB_MSG_TYPE_MAX])(void* input, char **msg, int32_t msgSize, int32_t *msgLen) = {0};
 
@@ -60,6 +60,36 @@ int32_t queryBuildTableMetaReqMsg(void* input, char **msg, int32_t msgSize, int3
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t queryBuildUseDbMsg(void* input, char **msg, int32_t msgSize, int32_t *msgLen) {
+  if (NULL == input || NULL == msg || NULL == msgLen) {
+    return TSDB_CODE_TSC_INVALID_INPUT;
+  }
+
+  SBuildUseDBInput* bInput = (SBuildUseDBInput *)input;
+
+  int32_t estimateSize = sizeof(SUseDbMsg);
+  if (NULL == *msg || msgSize < estimateSize) {
+    tfree(*msg);
+    *msg = calloc(1, estimateSize);
+    if (NULL == *msg) {
+      return TSDB_CODE_TSC_OUT_OF_MEMORY;
+    }
+  }
+
+  SUseDbMsg *bMsg = (SUseDbMsg *)*msg;
+
+  strncpy(bMsg->db, bInput->db, sizeof(bMsg->db));
+  bMsg->db[sizeof(bMsg->db) - 1] = 0;
+
+  bMsg->vgroupVersion = bInput->vgroupVersion;
+  bMsg->dbGroupVersion = bInput->dbGroupVersion;
+
+  *msgLen = (int32_t)sizeof(*bMsg);
+
+  return TSDB_CODE_SUCCESS;  
+}
+
+
 
 int32_t queryProcessVgroupListRsp(void* output, char *msg, int32_t msgSize) {
   if (NULL == output || NULL == msg || msgSize <= 0) {
@@ -103,12 +133,126 @@ int32_t queryProcessVgroupListRsp(void* output, char *msg, int32_t msgSize) {
   return TSDB_CODE_SUCCESS;
 }
 
+
+
+
+int32_t queryProcessUseDBRsp(void* output, char *msg, int32_t msgSize) {
+  if (NULL == output || NULL == msg || msgSize <= 0) {
+    return TSDB_CODE_TSC_INVALID_INPUT;
+  }
+
+  SUseDbRspMsg *pRsp = (SUseDbRspMsg *)msg;
+  SUseDbOutput *pOut = (SUseDbOutput *)output;
+  int32_t code = 0;
+
+  if (msgSize <= sizeof(*pRsp)) {
+    qError("invalid use db rsp msg size, msgSize:%d", msgSize);
+    return TSDB_CODE_TSC_VALUE_OUT_OF_RANGE;
+  }
+  
+  pRsp->vgroupVersion = htonl(pRsp->vgroupVersion);
+  pRsp->dbVgroupVersion = htonl(pRsp->dbVgroupVersion);
+
+  pRsp->vgroupNum = htonl(pRsp->vgroupNum);
+  pRsp->dbVgroupNum = htonl(pRsp->dbVgroupNum);
+
+  if (pRsp->vgroupNum < 0) {
+    qError("invalid vgroup number[%d]", pRsp->vgroupNum);
+    return TSDB_CODE_TSC_INVALID_VALUE;
+  }
+
+  if (pRsp->dbVgroupNum < 0) {
+    qError("invalid db vgroup number[%d]", pRsp->dbVgroupNum);
+    return TSDB_CODE_TSC_INVALID_VALUE;
+  }
+
+  int32_t expectSize = pRsp->vgroupNum * sizeof(pRsp->vgroupInfo[0]) + pRsp->dbVgroupNum * sizeof(int32_t) + sizeof(*pRsp);
+  if (msgSize != expectSize) {
+    qError("vgroup list msg size mis-match, msgSize:%d, expected:%d, vgroup number:%d, db vgroup number:%d", msgSize, expectSize, pRsp->vgroupNum, pRsp->dbVgroupNum);
+    return TSDB_CODE_TSC_VALUE_OUT_OF_RANGE;
+  }
+
+  if (pRsp->vgroupVersion < 0) {
+    qInfo("no new vgroup list info");
+    if (pRsp->vgroupNum != 0) {
+      qError("invalid vgroup number[%d] for no new vgroup list case", pRsp->vgroupNum);
+      return TSDB_CODE_TSC_INVALID_VALUE;
+    }
+  } else {
+    int32_t s = sizeof(*pOut->vgroupList) + sizeof(pOut->vgroupList->vgroupInfo[0]) * pRsp->vgroupNum;
+    pOut->vgroupList = calloc(1, s);
+    if (NULL == pOut->vgroupList) {
+      qError("calloc size[%d] failed", s);
+      return TSDB_CODE_TSC_OUT_OF_MEMORY;
+    }
+
+    pOut->vgroupList->vgroupNum = pRsp->vgroupNum;
+    pOut->vgroupList->vgroupVersion = pRsp->vgroupVersion;
+
+    for (int32_t i = 0; i < pRsp->vgroupNum; ++i) {
+      pRsp->vgroupInfo[i].vgId = htonl(pRsp->vgroupInfo[i].vgId);
+      for (int32_t n = 0; n < pRsp->vgroupInfo[i].numOfEps; ++n) {
+        pRsp->vgroupInfo[i].epAddr[n].port = htonl(pRsp->vgroupInfo[i].epAddr[n].port);
+      }
+
+      memcpy(&pOut->vgroupList->vgroupInfo[i], &pRsp->vgroupInfo[i], sizeof(pRsp->vgroupInfo[i]));
+    }
+  }
+
+  int32_t *vgIdList = (int32_t *)((char *)pRsp->vgroupInfo + sizeof(pRsp->vgroupInfo[0]) * pRsp->vgroupNum);
+
+  memcpy(pOut->db, pRsp->db, sizeof(pOut->db));
+  
+  if (pRsp->dbVgroupVersion < 0) {
+    qInfo("no new vgroup info for db[%s]", pRsp->db);
+  } else {
+    pOut->dbVgroup = calloc(1, sizeof(*pOut->dbVgroup));
+    if (NULL == pOut->dbVgroup) {
+      qError("calloc size[%d] failed", (int32_t)sizeof(*pOut->dbVgroup));
+      code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+      goto _exit;
+    }
+
+    pOut->dbVgroup->vgId = taosArrayInit(pRsp->dbVgroupNum, sizeof(int32_t));
+    if (NULL == pOut->dbVgroup->vgId) {
+      qError("taosArrayInit size[%d] failed", pRsp->dbVgroupNum);
+      code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+      goto _exit;
+    }
+    
+    pOut->dbVgroup->vgroupVersion = pRsp->dbVgroupVersion;
+    pOut->dbVgroup->hashRange = htonl(pRsp->dbHashRange);
+
+    for (int32_t i = 0; i < pRsp->dbVgroupNum; ++i) {
+      *(vgIdList + i) = htonl(*(vgIdList + i));
+      
+      taosArrayPush(pOut->dbVgroup->vgId, vgIdList + i) ;
+    }
+  }
+
+  return code;
+
+_exit:
+  if (pOut->dbVgroup && pOut->dbVgroup->vgId) {
+    taosArrayDestroy(pOut->dbVgroup->vgId);
+    pOut->dbVgroup->vgId = NULL;
+  }
+  
+  tfree(pOut->dbVgroup);
+  tfree(pOut->vgroupList);
+
+  return code;
+}
+
+
 void msgInit() {
   queryBuildMsg[TSDB_MSG_TYPE_TABLE_META] = queryBuildTableMetaReqMsg;
   queryBuildMsg[TSDB_MSG_TYPE_VGROUP_LIST] = queryBuildVgroupListReqMsg;
+  queryBuildMsg[TSDB_MSG_TYPE_USE_DB] = queryBuildUseDbMsg;
 
   //tscProcessMsgRsp[TSDB_MSG_TYPE_TABLE_META] = tscProcessTableMetaRsp;
   queryProcessMsgRsp[TSDB_MSG_TYPE_VGROUP_LIST] = queryProcessVgroupListRsp;
+  queryProcessMsgRsp[TSDB_MSG_TYPE_USE_DB] = queryProcessUseDBRsp;
 
 /*
   tscBuildMsg[TSDB_SQL_SELECT] = tscBuildQueryMsg;