diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index 1d6c684a01faba490577b9d6864be2091943818e..1adf3f0f0319d9653982a5539ee78d6a9f9a646f 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -309,8 +309,8 @@ do { \
 #define TSDB_MAX_DB_REPLICA_OPTION      3
 #define TSDB_DEFAULT_DB_REPLICA_OPTION  1
 
-#define TSDB_MIN_DB_PARTITON_OPTION     1
-#define TSDB_MAX_DB_PARTITON_OPTION     50000
+#define TSDB_MIN_DB_PARTITON_OPTION     0
+#define TSDB_MAX_DB_PARTITON_OPTION     1000
 #define TSDB_DEFAULT_DB_PARTITON_OPTION 4
 
 #define TSDB_MIN_DB_QUORUM_OPTION       1
diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 3eb197868b26115ff25206cc8db2bdd809c634cc..af933fa4e9cb194034b68643cdf23dbb6811ee02 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -185,6 +185,9 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_INVALID_DB_OPTION_DAYS    TAOS_DEF_ERROR_CODE(0, 0x0390)  //"Invalid database option: days out of range")
 #define TSDB_CODE_MND_INVALID_DB_OPTION_KEEP    TAOS_DEF_ERROR_CODE(0, 0x0391)  //"Invalid database option: keep >= keep1 >= keep0 >= days")
 
+#define TSDB_CODE_MND_INVALID_TOPIC             TAOS_DEF_ERROR_CODE(0, 0x0392)  //"Invalid topic name)
+#define TSDB_CODE_MND_INVALID_TOPIC_OPTION      TAOS_DEF_ERROR_CODE(0, 0x0393)  //"Invalid topic option)
+
 // dnode
 #define TSDB_CODE_DND_MSG_NOT_PROCESSED         TAOS_DEF_ERROR_CODE(0, 0x0400)  //"Message not processed")
 #define TSDB_CODE_DND_OUT_OF_MEMORY             TAOS_DEF_ERROR_CODE(0, 0x0401)  //"Dnode out of memory")
diff --git a/src/inc/taosmsg.h b/src/inc/taosmsg.h
index 40446e56f56f9fdcad888de25a5d64a6a8f6c3ca..f740575b7a0a59c62cd5819dfac1831f26565bec 100644
--- a/src/inc/taosmsg.h
+++ b/src/inc/taosmsg.h
@@ -683,7 +683,8 @@ typedef struct {
   int8_t   cacheLastRow;
   int32_t  vgCfgVersion;
   int8_t   dbReplica;
-  int8_t   reserved[9];
+  int8_t   dbType;
+  int8_t   reserved[8];
 } SVnodeCfg;
 
 typedef struct {
diff --git a/src/inc/tp.h b/src/inc/tp.h
index d2165f1d61380c1cff9acdea28acc169e3589e46..b0b787bf689dafb016416cb82c1ebeb049d7c104 100644
--- a/src/inc/tp.h
+++ b/src/inc/tp.h
@@ -22,6 +22,7 @@ extern "C" {
 
 int32_t tpInit();
 void    tpCleanUp();
+void    tpUpdateTs(int32_t *seq, void *pMsg);
 
 #ifdef __cplusplus
 }
diff --git a/src/mnode/src/mnodeDb.c b/src/mnode/src/mnodeDb.c
index 1c6231558f582b9d79db3feaa46c1c175c47bddd..7fbf43f253223dd2076d9a29e27277255ae1dfb6 100644
--- a/src/mnode/src/mnodeDb.c
+++ b/src/mnode/src/mnodeDb.c
@@ -49,12 +49,13 @@ static int32_t mnodeSetDbDropping(SDbObj *pDb);
 static int32_t mnodeGetDbMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
 static int32_t mnodeRetrieveDbs(SShowObj *pShow, char *data, int32_t rows, void *pConn);
 static int32_t mnodeProcessCreateDbMsg(SMnodeMsg *pMsg);
-static int32_t mnodeProcessAlterDbMsg(SMnodeMsg *pMsg);
 static int32_t mnodeProcessDropDbMsg(SMnodeMsg *pMsg);
+int32_t mnodeProcessAlterDbMsg(SMnodeMsg *pMsg);
 
 #ifndef _TOPIC
 int32_t tpInit() {}
 void    tpCleanUp() {}
+void    tpUpdateTs(int32_t *seq, void *pMsg) {}
 #endif
 
 static void mnodeDestroyDb(SDbObj *pDb) {
@@ -180,16 +181,9 @@ int32_t mnodeInitDbs() {
   mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_DB, mnodeGetDbMeta);
   mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_DB, mnodeRetrieveDbs);
   mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_DB, mnodeCancelGetNextDb);
-
-  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_CREATE_TP, mnodeProcessCreateDbMsg);
-  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_ALTER_TP, mnodeProcessAlterDbMsg);
-  mnodeAddWriteMsgHandle(TSDB_MSG_TYPE_CM_DROP_TP, mnodeProcessDropDbMsg);
-  mnodeAddShowMetaHandle(TSDB_MGMT_TABLE_TP, mnodeGetDbMeta);
-  mnodeAddShowRetrieveHandle(TSDB_MGMT_TABLE_TP, mnodeRetrieveDbs);
-  mnodeAddShowFreeIterHandle(TSDB_MGMT_TABLE_TP, mnodeCancelGetNextDb);
-
+  
   mDebug("table:dbs table is created");
-  return 0;
+  return tpInit();
 }
 
 void *mnodeGetNextDb(void *pIter, SDbObj **pDb) {
@@ -345,6 +339,17 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
     return TSDB_CODE_MND_INVALID_DB_OPTION;
   }
 
+  if (pCfg->dbType < 0 || pCfg->dbType > 1) {
+    mError("invalid db option dbType:%d valid range: [%d, %d]", pCfg->dbType, 0, 1);
+    return TSDB_CODE_MND_INVALID_DB_OPTION;
+  }
+
+  if (pCfg->partitions < TSDB_MIN_DB_PARTITON_OPTION || pCfg->partitions > TSDB_MAX_DB_PARTITON_OPTION) {
+    mError("invalid db option partitions:%d valid range: [%d, %d]", pCfg->partitions, TSDB_MIN_DB_PARTITON_OPTION,
+           TSDB_MAX_DB_PARTITON_OPTION);
+    return TSDB_CODE_MND_INVALID_DB_OPTION;
+  }
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -697,7 +702,7 @@ static int32_t mnodeRetrieveDbs(SShowObj *pShow, char *data, int32_t rows, void
     pShow->pIter = mnodeGetNextDb(pShow->pIter, &pDb);
 
     if (pDb == NULL) break;
-    if (pDb->pAcct != pUser->pAcct || pDb->status != TSDB_DB_STATUS_READY /*|| pDb->cfg.dbType != TSDB_DB_TYPE_DEFAULT*/) {
+    if (pDb->pAcct != pUser->pAcct || pDb->status != TSDB_DB_STATUS_READY) {
       mnodeDecDbRef(pDb);
       continue;
     }
@@ -1092,7 +1097,7 @@ static int32_t mnodeAlterDb(SDbObj *pDb, SAlterDbMsg *pAlter, void *pMsg) {
   return code;
 }
 
-static int32_t mnodeProcessAlterDbMsg(SMnodeMsg *pMsg) {
+int32_t mnodeProcessAlterDbMsg(SMnodeMsg *pMsg) {
   SAlterDbMsg *pAlter = pMsg->rpcMsg.pCont;
   mDebug("db:%s, alter db msg is received from thandle:%p", pAlter->db, pMsg->rpcMsg.handle);
 
diff --git a/src/mnode/src/mnodeVgroup.c b/src/mnode/src/mnodeVgroup.c
index 67ee11640b04c355f0a15d0df12eacc5f1837d7b..f17f3ad8d902e61bfa4fd5007c37af28911dce9b 100644
--- a/src/mnode/src/mnodeVgroup.c
+++ b/src/mnode/src/mnodeVgroup.c
@@ -367,6 +367,11 @@ static int32_t mnodeAllocVgroupIdPool(SVgObj *pInputVgroup) {
     maxIdPoolSize = MAX(maxIdPoolSize, idPoolSize);
   }
 
+  // create one table each vnode
+  if (pDb->cfg.dbType == TSDB_DB_TYPE_TOPIC) {
+    maxIdPoolSize = 1;
+  }
+
   // new vgroup
   if (pInputVgroup->idPool == NULL) {
     pInputVgroup->idPool = taosInitIdPool(maxIdPoolSize);
@@ -379,6 +384,11 @@ static int32_t mnodeAllocVgroupIdPool(SVgObj *pInputVgroup) {
     }
   }
 
+  // create one table each vnode
+  if (pDb->cfg.dbType == TSDB_DB_TYPE_TOPIC) {
+    return TSDB_CODE_SUCCESS;
+  }
+
   // realloc all vgroups in db
   int32_t newIdPoolSize;
   if (minIdPoolSize * 4 < tsTableIncStepPerVnode) {
@@ -449,6 +459,10 @@ int32_t mnodeGetAvailableVgroup(SMnodeMsg *pMsg, SVgObj **ppVgroup, int32_t *pSi
     maxVgroupsPerDb = MIN(maxVgroupsPerDb, TSDB_MAX_VNODES_PER_DB);
   }
 
+  if (pDb->cfg.dbType == TSDB_DB_TYPE_TOPIC && pDb->cfg.partitions > 0) {
+    maxVgroupsPerDb = pDb->cfg.partitions;
+  }
+
   int32_t code = TSDB_CODE_MND_NO_ENOUGH_DNODES;
   if (pDb->numOfVgroups < maxVgroupsPerDb) {
     mDebug("msg:%p, app:%p db:%s, try to create a new vgroup, numOfVgroups:%d maxVgroupsPerDb:%d", pMsg,
@@ -880,6 +894,7 @@ static SCreateVnodeMsg *mnodeBuildVnodeMsg(SVgObj *pVgroup) {
   pCfg->update              = pDb->cfg.update;
   pCfg->cacheLastRow        = pDb->cfg.cacheLastRow;
   pCfg->dbReplica           = pDb->cfg.replications;
+  pCfg->dbType              = pDb->cfg.dbType;
   
   SVnodeDesc *pNodes = pVnode->nodes;
   for (int32_t j = 0; j < pVgroup->numOfVnodes; ++j) {
diff --git a/src/util/src/terror.c b/src/util/src/terror.c
index 4a011b7cc7407acabe249b577280f7bbda58f79d..221e6183909682680b68c7a0debb2a90eca34c37 100644
--- a/src/util/src/terror.c
+++ b/src/util/src/terror.c
@@ -197,6 +197,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_VGROUP_NOT_READY,         "Database unsynced")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_DB_OPTION_DAYS,   "Invalid database option: days out of range")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_DB_OPTION_KEEP,   "Invalid database option: keep >= keep1 >= keep0 >= days")
 
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_TOPIC,            "Invalid topic name")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_INVALID_TOPIC_OPTION,     "Invalid topic option")
+
 // dnode
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_MSG_NOT_PROCESSED,        "Message not processed")
 TAOS_DEFINE_ERROR(TSDB_CODE_DND_OUT_OF_MEMORY,            "Dnode out of memory")
diff --git a/src/vnode/inc/vnodeInt.h b/src/vnode/inc/vnodeInt.h
index 3ec77bbc122341935a804448eca61258c634cf58..91ddf5076b0540613cdac7047f0a1ea0cdd21c0b 100644
--- a/src/vnode/inc/vnodeInt.h
+++ b/src/vnode/inc/vnodeInt.h
@@ -40,6 +40,7 @@ typedef struct {
   int32_t  queuedWMsg;
   int32_t  queuedRMsg;
   int32_t  flowctrlLevel;
+  int32_t  sequence;  // for topic
   int8_t   status;
   int8_t   role;
   int8_t   accessState;
@@ -47,7 +48,7 @@ typedef struct {
   int8_t   isCommiting;
   int8_t   dbReplica;
   int8_t   dropped;
-  int8_t   reserved;
+  int8_t   dbType;
   uint64_t version;   // current version
   uint64_t cversion;  // version while commit start
   uint64_t fversion;  // version on saved data file
diff --git a/src/vnode/src/vnodeCfg.c b/src/vnode/src/vnodeCfg.c
index 03f2b11eec239ad469faec66ddcbd60282e0409b..c9cd366c6406cb3212fc271f924e1c7b4c42995d 100644
--- a/src/vnode/src/vnodeCfg.c
+++ b/src/vnode/src/vnodeCfg.c
@@ -42,6 +42,7 @@ static void vnodeLoadCfg(SVnodeObj *pVnode, SCreateVnodeMsg* vnodeMsg) {
   pVnode->syncCfg.replica = vnodeMsg->cfg.vgReplica;
   pVnode->syncCfg.quorum = vnodeMsg->cfg.quorum;
   pVnode->dbReplica = vnodeMsg->cfg.dbReplica;
+  pVnode->dbType = vnodeMsg->cfg.dbType;
 
   for (int i = 0; i < pVnode->syncCfg.replica; ++i) {
     SVnodeDesc *node = &vnodeMsg->nodes[i];
@@ -214,7 +215,7 @@ int32_t vnodeReadCfg(SVnodeObj *pVnode) {
 
   cJSON *dbReplica = cJSON_GetObjectItem(root, "dbReplica");
   if (!dbReplica || dbReplica->type != cJSON_Number) {
-    vError("vgId:%d, failed to read %s, dbReplica not found", pVnode->vgId, file);
+    vWarn("vgId:%d, failed to read %s, dbReplica not found", pVnode->vgId, file);
     vnodeMsg.cfg.dbReplica = vnodeMsg.cfg.vgReplica;
     vnodeMsg.cfg.vgCfgVersion = 0;
   } else {
@@ -230,7 +231,7 @@ int32_t vnodeReadCfg(SVnodeObj *pVnode) {
 
   cJSON *update = cJSON_GetObjectItem(root, "update");
   if (!update || update->type != cJSON_Number) {
-    vError("vgId: %d, failed to read %s, update not found", pVnode->vgId, file);
+    vWarn("vgId: %d, failed to read %s, update not found", pVnode->vgId, file);
     vnodeMsg.cfg.update = 0;
     vnodeMsg.cfg.vgCfgVersion = 0;
   } else {
@@ -239,13 +240,21 @@ int32_t vnodeReadCfg(SVnodeObj *pVnode) {
 
   cJSON *cacheLastRow = cJSON_GetObjectItem(root, "cacheLastRow");
   if (!cacheLastRow || cacheLastRow->type != cJSON_Number) {
-    vError("vgId: %d, failed to read %s, cacheLastRow not found", pVnode->vgId, file);
+    vWarn("vgId: %d, failed to read %s, cacheLastRow not found", pVnode->vgId, file);
     vnodeMsg.cfg.cacheLastRow = 0;
     vnodeMsg.cfg.vgCfgVersion = 0;
   } else {
     vnodeMsg.cfg.cacheLastRow = (int8_t)cacheLastRow->valueint;
   }
 
+  cJSON *dbType = cJSON_GetObjectItem(root, "dbType");
+  if (!dbType || dbType->type != cJSON_Number) {
+    vWarn("vgId: %d, failed to read %s, dbType not found", pVnode->vgId, file);
+    vnodeMsg.cfg.dbType = 0;
+  } else {
+    vnodeMsg.cfg.dbType = (int8_t)dbType->valueint;
+  }
+
   cJSON *nodeInfos = cJSON_GetObjectItem(root, "nodeInfos");
   if (!nodeInfos || nodeInfos->type != cJSON_Array) {
     vError("vgId:%d, failed to read %s, nodeInfos not found", pVnode->vgId, file);
@@ -337,6 +346,7 @@ int32_t vnodeWriteCfg(SCreateVnodeMsg *pMsg) {
   len += snprintf(content + len, maxLen - len, "  \"quorum\": %d,\n", pMsg->cfg.quorum);
   len += snprintf(content + len, maxLen - len, "  \"update\": %d,\n", pMsg->cfg.update);
   len += snprintf(content + len, maxLen - len, "  \"cacheLastRow\": %d,\n", pMsg->cfg.cacheLastRow);
+  len += snprintf(content + len, maxLen - len, "  \"dbType\": %d,\n", pMsg->cfg.dbType);
   len += snprintf(content + len, maxLen - len, "  \"nodeInfos\": [{\n");
   for (int32_t i = 0; i < pMsg->cfg.vgReplica; i++) {
     SVnodeDesc *node = &pMsg->nodes[i];
diff --git a/src/vnode/src/vnodeWrite.c b/src/vnode/src/vnodeWrite.c
index 99b7e7b62890c2801835d4a6130d49b9b224ddab..a1d4f50010f1cd3825146dbc2506d53ad3e17c09 100644
--- a/src/vnode/src/vnodeWrite.c
+++ b/src/vnode/src/vnodeWrite.c
@@ -15,6 +15,7 @@
 
 #define _DEFAULT_SOURCE
 #include "os.h"
+#include "tp.h"
 #include "taosmsg.h"
 #include "taoserror.h"
 #include "tglobal.h"
@@ -139,6 +140,10 @@ static int32_t vnodeProcessSubmitMsg(SVnodeObj *pVnode, void *pCont, SRspRet *pR
 
   vTrace("vgId:%d, submit msg is processed", pVnode->vgId);
 
+  if (pVnode->dbType == TSDB_DB_TYPE_TOPIC && pVnode->role == TAOS_SYNC_ROLE_MASTER) {
+    tpUpdateTs(&pVnode->sequence, pCont);
+  }
+
   // save insert result into item
   SShellSubmitRspMsg *pRsp = NULL;
   if (pRet) {