diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 7920ae0658..9e5cdee516 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -28,7 +28,6 @@ static int32_t hbMqHbRspHandle(struct SAppHbMgr *pAppHbMgr, SClientHbRsp* pRsp)
 }
 
 static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog *pCatalog) {
-  int32_t msgLen = 0;
   int32_t code = 0;
 
   SUseDbBatchRsp batchUseRsp = {0};
@@ -72,8 +71,6 @@ static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog
     if (code) {
       return code;
     }
-
-    msgLen += sizeof(SUseDbRsp) + rsp->vgNum * sizeof(SVgroupInfo);
   }
 
   return TSDB_CODE_SUCCESS;
diff --git a/source/client/src/clientMsgHandler.c b/source/client/src/clientMsgHandler.c
index 8ab1880069..0f3e4af575 100644
--- a/source/client/src/clientMsgHandler.c
+++ b/source/client/src/clientMsgHandler.c
@@ -264,9 +264,13 @@ int32_t processUseDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
     return code;
   }
 
-  SUseDbRsp* pUseDbRsp = (SUseDbRsp*) pMsg->pData;
+  SUseDbRsp usedbRsp = {0};
+  tDeserializeSUseDbRsp(pMsg->pData, pMsg->len, &usedbRsp);
+
   SName name = {0};
-  tNameFromString(&name, pUseDbRsp->db, T_NAME_ACCT|T_NAME_DB);
+  tNameFromString(&name, usedbRsp.db, T_NAME_ACCT|T_NAME_DB);
+
+  tFreeSUsedbRsp(&usedbRsp);
 
   char db[TSDB_DB_NAME_LEN] = {0};
   tNameGetDbName(&name, db);
@@ -300,14 +304,12 @@ int32_t processDropDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
     return code;
   }
 
-  SDropDbRsp *rsp = (SDropDbRsp *)pMsg->pData;
-
-  struct SCatalog *pCatalog = NULL;
-  rsp->uid = be64toh(rsp->uid);
+  SDropDbRsp dropdbRsp = {0};
+  tDeserializeSDropDbRsp(pMsg->pData, pMsg->len, &dropdbRsp);
 
+  struct SCatalog* pCatalog = NULL;
   catalogGetHandle(pRequest->pTscObj->pAppInfo->clusterId, &pCatalog);
-  
-  catalogRemoveDB(pCatalog, rsp->db, rsp->uid);
+  catalogRemoveDB(pCatalog, dropdbRsp.db, dropdbRsp.uid);
 
   tsem_post(&pRequest->body.rspSem);
   return code;
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 56d743cd5a..7c42ed5df6 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -975,30 +975,37 @@ int32_t mndValidateDbInfo(SMnode *pMnode, SDbVgVersion *pDbs, int32_t numOfDbs,
     pDbVgVersion->dbId = htobe64(pDbVgVersion->dbId);
     pDbVgVersion->vgVersion = htonl(pDbVgVersion->vgVersion);
 
-    SDbObj *pDb = mndAcquireDb(pMnode, pDbVgVersion->dbFName);
-    if (pDb == NULL || pDbVgVersion->vgVersion >= pDb->vgVersion) {
-      mndReleaseDb(pMnode, pDb);
-      mDebug("db:%s, no need to use db", pDbVgVersion->dbFName);
-      continue;
-    }
-
     SUseDbRsp usedbRsp = {0};
-    usedbRsp.pVgroupInfos = taosArrayInit(pDb->cfg.numOfVgroups, sizeof(SVgroupInfo));
-    if (usedbRsp.pVgroupInfos == NULL) {
+
+    SDbObj *pDb = mndAcquireDb(pMnode, pDbVgVersion->dbFName);
+    if (pDb == NULL) {
+      mDebug("db:%s, no exist", pDbVgVersion->dbFName);
+      memcpy(usedbRsp.db, pDbVgVersion->dbFName, TSDB_DB_FNAME_LEN);
+      usedbRsp.uid = pDbVgVersion->dbId;
+      usedbRsp.vgVersion = -1;
+      taosArrayPush(batchUseRsp.pArray, &usedbRsp);
+    } else if (pDbVgVersion->vgVersion >= pDb->vgVersion) {
+      mDebug("db:%s, version not changed", pDbVgVersion->dbFName);
       mndReleaseDb(pMnode, pDb);
-      mError("db:%s, failed to malloc usedb response", pDb->name);
       continue;
+    } else {
+      usedbRsp.pVgroupInfos = taosArrayInit(pDb->cfg.numOfVgroups, sizeof(SVgroupInfo));
+      if (usedbRsp.pVgroupInfos == NULL) {
+        mndReleaseDb(pMnode, pDb);
+        mError("db:%s, failed to malloc usedb response", pDb->name);
+        continue;
+      }
+
+      mndBuildDBVgroupInfo(pDb, pMnode, usedbRsp.pVgroupInfos);
+      memcpy(usedbRsp.db, pDb->name, TSDB_DB_FNAME_LEN);
+      usedbRsp.uid = pDb->uid;
+      usedbRsp.vgVersion = pDb->vgVersion;
+      usedbRsp.vgNum = (int32_t)taosArrayGetSize(usedbRsp.pVgroupInfos);
+      usedbRsp.hashMethod = pDb->hashMethod;
+
+      taosArrayPush(batchUseRsp.pArray, &usedbRsp);
+      mndReleaseDb(pMnode, pDb);
     }
-
-    mndBuildDBVgroupInfo(pDb, pMnode, usedbRsp.pVgroupInfos);
-    memcpy(usedbRsp.db, pDb->name, TSDB_DB_FNAME_LEN);
-    usedbRsp.uid = pDb->uid;
-    usedbRsp.vgVersion = pDb->vgVersion;
-    usedbRsp.vgNum = (int32_t)taosArrayGetSize(usedbRsp.pVgroupInfos);
-    usedbRsp.hashMethod = pDb->hashMethod;
-
-    taosArrayPush(batchUseRsp.pArray, &usedbRsp);
-    mndReleaseDb(pMnode, pDb);
   }
 
   int32_t rspLen = tSerializeSUseDbBatchRsp(NULL, 0, &batchUseRsp);
diff --git a/source/dnode/mnode/impl/test/stb/stb.cpp b/source/dnode/mnode/impl/test/stb/stb.cpp
index 6d0005fd15..87df50ef0e 100644
--- a/source/dnode/mnode/impl/test/stb/stb.cpp
+++ b/source/dnode/mnode/impl/test/stb/stb.cpp
@@ -69,10 +69,12 @@ void* MndTestStb::BuildCreateDbReq(const char* dbname, int32_t* pContLen) {
 }
 
 void* MndTestStb::BuildDropDbReq(const char* dbname, int32_t* pContLen) {
-  int32_t contLen = sizeof(SDropDbReq);
+  SDropDbReq dropdbReq = {0};
+  strcpy(dropdbReq.db, dbname);
 
-  SDropDbReq* pReq = (SDropDbReq*)rpcMallocCont(contLen);
-  strcpy(pReq->db, dbname);
+  int32_t contLen = tSerializeSDropDbReq(NULL, 0, &dropdbReq);
+  void*   pReq = rpcMallocCont(contLen);
+  tSerializeSDropDbReq(pReq, contLen, &dropdbReq);
 
   *pContLen = contLen;
   return pReq;
diff --git a/source/libs/parser/inc/astToMsg.h b/source/libs/parser/inc/astToMsg.h
index d7b6469abb..a1e4225410 100644
--- a/source/libs/parser/inc/astToMsg.h
+++ b/source/libs/parser/inc/astToMsg.h
@@ -9,7 +9,7 @@ char* buildUserManipulationMsg(SSqlInfo* pInfo, int32_t* outputLen, int64_t id,
 char* buildAcctManipulationMsg(SSqlInfo* pInfo, int32_t* outputLen, int64_t id, char* msgBuf, int32_t msgLen);
 char* buildDropUserMsg(SSqlInfo* pInfo, int32_t* outputLen, int64_t id, char* msgBuf, int32_t msgLen);
 SShowReq* buildShowMsg(SShowInfo* pShowInfo, SParseContext* pParseCtx, SMsgBuf* pMsgBuf);
-SCreateDbReq* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, SParseContext *pCtx, SMsgBuf* pMsgBuf);
+char* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, int32_t *len, SParseContext *pCtx, SMsgBuf* pMsgBuf);
 char* buildCreateStbReq(SCreateTableSql* pCreateTableSql, int32_t* len, SParseContext* pParseCtx, SMsgBuf* pMsgBuf);
 char* buildDropStableReq(SSqlInfo* pInfo, int32_t* len, SParseContext* pParseCtx, SMsgBuf* pMsgBuf);
 char* buildCreateDnodeMsg(SSqlInfo* pInfo, int32_t* len, SMsgBuf* pMsgBuf);
diff --git a/source/libs/parser/src/astToMsg.c b/source/libs/parser/src/astToMsg.c
index 1fae979ee9..adcd740ef6 100644
--- a/source/libs/parser/src/astToMsg.c
+++ b/source/libs/parser/src/astToMsg.c
@@ -39,14 +39,11 @@ char* buildAcctManipulationMsg(SSqlInfo* pInfo, int32_t* outputLen, int64_t id,
 
   SCreateAcctInfo* pAcctOpt = &pInfo->pMiscInfo->acctOpt;
 
-  createReq.maxUsers = htonl(pAcctOpt->maxUsers);
-  createReq.maxDbs = htonl(pAcctOpt->maxDbs);
-  createReq.maxTimeSeries = htonl(pAcctOpt->maxTimeSeries);
-  createReq.maxStreams = htonl(pAcctOpt->maxStreams);
-  //  createReq.maxPointsPerSecond = htonl(pAcctOpt->maxPointsPerSecond);
-  createReq.maxStorage = htobe64(pAcctOpt->maxStorage);
-  //  createReq.maxQueryTime = htobe64(pAcctOpt->maxQueryTime);
-  //  createReq.maxConnections = htonl(pAcctOpt->maxConnections);
+  createReq.maxUsers = pAcctOpt->maxUsers;
+  createReq.maxDbs = pAcctOpt->maxDbs;
+  createReq.maxTimeSeries = pAcctOpt->maxTimeSeries;
+  createReq.maxStreams = pAcctOpt->maxStreams;
+  createReq.maxStorage = pAcctOpt->maxStorage;
 
   if (pAcctOpt->stat.n == 0) {
     createReq.accessState = -1;
@@ -147,9 +144,9 @@ static int32_t setKeepOption(SCreateDbReq* pMsg, const SCreateDbInfo* pCreateDb,
   const char* msg2 = "invalid keep value";
   const char* msg3 = "invalid keep value, should be keep0 <= keep1 <= keep2";
 
-  pMsg->daysToKeep0 = htonl(-1);
-  pMsg->daysToKeep1 = htonl(-1);
-  pMsg->daysToKeep2 = htonl(-1);
+  pMsg->daysToKeep0 = -1;
+  pMsg->daysToKeep1 = -1;
+  pMsg->daysToKeep2 = -1;
 
   SArray* pKeep = pCreateDb->keep;
   if (pKeep != NULL) {
@@ -209,13 +206,13 @@ static int32_t setTimePrecision(SCreateDbReq* pMsg, const SCreateDbInfo* pCreate
 }
 
 static void doSetDbOptions(SCreateDbReq* pMsg, const SCreateDbInfo* pCreateDb) {
-  pMsg->cacheBlockSize = htonl(pCreateDb->cacheBlockSize);
-  pMsg->totalBlocks = htonl(pCreateDb->numOfBlocks);
-  pMsg->daysPerFile = htonl(pCreateDb->daysPerFile);
-  pMsg->commitTime = htonl((int32_t)pCreateDb->commitTime);
-  pMsg->minRows = htonl(pCreateDb->minRowsPerBlock);
-  pMsg->maxRows = htonl(pCreateDb->maxRowsPerBlock);
-  pMsg->fsyncPeriod = htonl(pCreateDb->fsyncPeriod);
+  pMsg->cacheBlockSize = pCreateDb->cacheBlockSize;
+  pMsg->totalBlocks = pCreateDb->numOfBlocks;
+  pMsg->daysPerFile = pCreateDb->daysPerFile;
+  pMsg->commitTime = (int32_t)pCreateDb->commitTime;
+  pMsg->minRows = pCreateDb->minRowsPerBlock;
+  pMsg->maxRows = pCreateDb->maxRowsPerBlock;
+  pMsg->fsyncPeriod = pCreateDb->fsyncPeriod;
   pMsg->compression = (int8_t)pCreateDb->compressionLevel;
   pMsg->walLevel = (char)pCreateDb->walLevel;
   pMsg->replications = pCreateDb->replica;
@@ -223,7 +220,7 @@ static void doSetDbOptions(SCreateDbReq* pMsg, const SCreateDbInfo* pCreateDb) {
   pMsg->ignoreExist = pCreateDb->ignoreExists;
   pMsg->update = pCreateDb->update;
   pMsg->cacheLastRow = pCreateDb->cachelast;
-  pMsg->numOfVgroups = htonl(pCreateDb->numOfVgroups);
+  pMsg->numOfVgroups = pCreateDb->numOfVgroups;
 }
 
 int32_t setDbOptions(SCreateDbReq* pCreateDbMsg, const SCreateDbInfo* pCreateDbSql, SMsgBuf* pMsgBuf) {
@@ -240,12 +237,104 @@ int32_t setDbOptions(SCreateDbReq* pCreateDbMsg, const SCreateDbInfo* pCreateDbS
   return TSDB_CODE_SUCCESS;
 }
 
-SCreateDbReq* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, SParseContext* pCtx, SMsgBuf* pMsgBuf) {
-  SCreateDbReq* pCreateMsg = calloc(1, sizeof(SCreateDbReq));
-  if (setDbOptions(pCreateMsg, pCreateDbInfo, pMsgBuf) != TSDB_CODE_SUCCESS) {
-    tfree(pCreateMsg);
-    terrno = TSDB_CODE_TSC_INVALID_OPERATION;
+// can only perform the parameters based on the macro definitation
+static int32_t doCheckDbOptions(SCreateDbReq* pCreate, SMsgBuf* pMsgBuf) {
+  char msg[512] = {0};
 
+  if (pCreate->walLevel != -1 && (pCreate->walLevel < TSDB_MIN_WAL_LEVEL || pCreate->walLevel > TSDB_MAX_WAL_LEVEL)) {
+    snprintf(msg, tListLen(msg), "invalid db option walLevel: %d, only 1-2 allowed", pCreate->walLevel);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  if (pCreate->replications != -1 &&
+      (pCreate->replications < TSDB_MIN_DB_REPLICA_OPTION || pCreate->replications > TSDB_MAX_DB_REPLICA_OPTION)) {
+    snprintf(msg, tListLen(msg), "invalid db option replications: %d valid range: [%d, %d]", pCreate->replications,
+             TSDB_MIN_DB_REPLICA_OPTION, TSDB_MAX_DB_REPLICA_OPTION);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  int32_t blocks = pCreate->totalBlocks;
+  if (blocks != -1 && (blocks < TSDB_MIN_TOTAL_BLOCKS || blocks > TSDB_MAX_TOTAL_BLOCKS)) {
+    snprintf(msg, tListLen(msg), "invalid db option totalBlocks: %d valid range: [%d, %d]", blocks,
+             TSDB_MIN_TOTAL_BLOCKS, TSDB_MAX_TOTAL_BLOCKS);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  if (pCreate->quorum != -1 &&
+      (pCreate->quorum < TSDB_MIN_DB_QUORUM_OPTION || pCreate->quorum > TSDB_MAX_DB_QUORUM_OPTION)) {
+    snprintf(msg, tListLen(msg), "invalid db option quorum: %d valid range: [%d, %d]", pCreate->quorum,
+             TSDB_MIN_DB_QUORUM_OPTION, TSDB_MAX_DB_QUORUM_OPTION);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  int32_t val = pCreate->daysPerFile;
+  if (val != -1 && (val < TSDB_MIN_DAYS_PER_FILE || val > TSDB_MAX_DAYS_PER_FILE)) {
+    snprintf(msg, tListLen(msg), "invalid db option daysPerFile: %d valid range: [%d, %d]", val, TSDB_MIN_DAYS_PER_FILE,
+             TSDB_MAX_DAYS_PER_FILE);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  val = pCreate->cacheBlockSize;
+  if (val != -1 && (val < TSDB_MIN_CACHE_BLOCK_SIZE || val > TSDB_MAX_CACHE_BLOCK_SIZE)) {
+    snprintf(msg, tListLen(msg), "invalid db option cacheBlockSize: %d valid range: [%d, %d]", val,
+             TSDB_MIN_CACHE_BLOCK_SIZE, TSDB_MAX_CACHE_BLOCK_SIZE);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  if (pCreate->precision != TSDB_TIME_PRECISION_MILLI && pCreate->precision != TSDB_TIME_PRECISION_MICRO &&
+      pCreate->precision != TSDB_TIME_PRECISION_NANO) {
+    snprintf(msg, tListLen(msg), "invalid db option timePrecision: %d valid value: [%d, %d, %d]", pCreate->precision,
+             TSDB_TIME_PRECISION_MILLI, TSDB_TIME_PRECISION_MICRO, TSDB_TIME_PRECISION_NANO);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  val = pCreate->commitTime;
+  if (val != -1 && (val < TSDB_MIN_COMMIT_TIME || val > TSDB_MAX_COMMIT_TIME)) {
+    snprintf(msg, tListLen(msg), "invalid db option commitTime: %d valid range: [%d, %d]", val, TSDB_MIN_COMMIT_TIME,
+             TSDB_MAX_COMMIT_TIME);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  val = pCreate->fsyncPeriod;
+  if (val != -1 && (val < TSDB_MIN_FSYNC_PERIOD || val > TSDB_MAX_FSYNC_PERIOD)) {
+    snprintf(msg, tListLen(msg), "invalid db option fsyncPeriod: %d valid range: [%d, %d]", val, TSDB_MIN_FSYNC_PERIOD,
+             TSDB_MAX_FSYNC_PERIOD);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  if (pCreate->compression != -1 &&
+      (pCreate->compression < TSDB_MIN_COMP_LEVEL || pCreate->compression > TSDB_MAX_COMP_LEVEL)) {
+    snprintf(msg, tListLen(msg), "invalid db option compression: %d valid range: [%d, %d]", pCreate->compression,
+             TSDB_MIN_COMP_LEVEL, TSDB_MAX_COMP_LEVEL);
+    return buildInvalidOperationMsg(pMsgBuf, msg);
+  }
+
+  val = pCreate->numOfVgroups;
+  if (val < TSDB_MIN_VNODES_PER_DB || val > TSDB_MAX_VNODES_PER_DB) {
+    snprintf(msg, tListLen(msg), "invalid number of vgroups for DB:%d valid range: [%d, %d]", val,
+             TSDB_MIN_VNODES_PER_DB, TSDB_MAX_VNODES_PER_DB);
+  }
+
+  val = pCreate->maxRows;
+  if (val < TSDB_MIN_MAX_ROW_FBLOCK || val > TSDB_MAX_MAX_ROW_FBLOCK) {
+    snprintf(msg, tListLen(msg), "invalid number of max rows in file block for DB:%d valid range: [%d, %d]", val,
+             TSDB_MIN_MAX_ROW_FBLOCK, TSDB_MAX_MAX_ROW_FBLOCK);
+  }
+
+  val = pCreate->minRows;
+  if (val < TSDB_MIN_MIN_ROW_FBLOCK || val > TSDB_MAX_MIN_ROW_FBLOCK) {
+    snprintf(msg, tListLen(msg), "invalid number of min rows in file block for DB:%d valid range: [%d, %d]", val,
+             TSDB_MIN_MIN_ROW_FBLOCK, TSDB_MAX_MIN_ROW_FBLOCK);
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+char* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, int32_t* len, SParseContext* pCtx, SMsgBuf* pMsgBuf) {
+  SCreateDbReq createReq = {0};
+
+  if (setDbOptions(&createReq, pCreateDbInfo, pMsgBuf) != TSDB_CODE_SUCCESS) {
+    terrno = TSDB_CODE_TSC_INVALID_OPERATION;
     return NULL;
   }
 
@@ -256,8 +345,23 @@ SCreateDbReq* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, SParseContext* pCtx
     return NULL;
   }
 
-  tNameGetFullDbName(&name, pCreateMsg->db);
-  return pCreateMsg;
+  tNameGetFullDbName(&name, createReq.db);
+
+  if (doCheckDbOptions(&createReq, pMsgBuf) != TSDB_CODE_SUCCESS) {
+    terrno = TSDB_CODE_TSC_INVALID_OPERATION;
+    return NULL;
+  }
+
+  int32_t tlen = tSerializeSCreateDbReq(NULL, 0, &createReq);
+  void*   pReq = malloc(tlen);
+  if (pReq == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
+
+  tSerializeSCreateDbReq(pReq, tlen, &createReq);
+  *len = tlen;
+  return pReq;
 }
 
 char* buildCreateStbReq(SCreateTableSql* pCreateTableSql, int32_t* len, SParseContext* pParseCtx, SMsgBuf* pMsgBuf) {
diff --git a/source/libs/parser/src/dCDAstProcess.c b/source/libs/parser/src/dCDAstProcess.c
index 4b70d2c6c3..1a933f5d85 100644
--- a/source/libs/parser/src/dCDAstProcess.c
+++ b/source/libs/parser/src/dCDAstProcess.c
@@ -125,99 +125,6 @@ static int32_t setShowInfo(SShowInfo* pShowInfo, SParseContext* pCtx, void** out
   return TSDB_CODE_SUCCESS;
 }
 
-// can only perform the parameters based on the macro definitation
-static int32_t doCheckDbOptions(SCreateDbReq* pCreate, SMsgBuf* pMsgBuf) {
-  char msg[512] = {0};
-
-  if (pCreate->walLevel != -1 && (pCreate->walLevel < TSDB_MIN_WAL_LEVEL || pCreate->walLevel > TSDB_MAX_WAL_LEVEL)) {
-    snprintf(msg, tListLen(msg), "invalid db option walLevel: %d, only 1-2 allowed", pCreate->walLevel);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  if (pCreate->replications != -1 &&
-      (pCreate->replications < TSDB_MIN_DB_REPLICA_OPTION || pCreate->replications > TSDB_MAX_DB_REPLICA_OPTION)) {
-    snprintf(msg, tListLen(msg), "invalid db option replications: %d valid range: [%d, %d]", pCreate->replications,
-             TSDB_MIN_DB_REPLICA_OPTION, TSDB_MAX_DB_REPLICA_OPTION);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  int32_t blocks = ntohl(pCreate->totalBlocks);
-  if (blocks != -1 && (blocks < TSDB_MIN_TOTAL_BLOCKS || blocks > TSDB_MAX_TOTAL_BLOCKS)) {
-    snprintf(msg, tListLen(msg), "invalid db option totalBlocks: %d valid range: [%d, %d]", blocks,
-             TSDB_MIN_TOTAL_BLOCKS, TSDB_MAX_TOTAL_BLOCKS);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  if (pCreate->quorum != -1 &&
-      (pCreate->quorum < TSDB_MIN_DB_QUORUM_OPTION || pCreate->quorum > TSDB_MAX_DB_QUORUM_OPTION)) {
-    snprintf(msg, tListLen(msg), "invalid db option quorum: %d valid range: [%d, %d]", pCreate->quorum,
-             TSDB_MIN_DB_QUORUM_OPTION, TSDB_MAX_DB_QUORUM_OPTION);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  int32_t val = htonl(pCreate->daysPerFile);
-  if (val != -1 && (val < TSDB_MIN_DAYS_PER_FILE || val > TSDB_MAX_DAYS_PER_FILE)) {
-    snprintf(msg, tListLen(msg), "invalid db option daysPerFile: %d valid range: [%d, %d]", val, TSDB_MIN_DAYS_PER_FILE,
-             TSDB_MAX_DAYS_PER_FILE);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  val = htonl(pCreate->cacheBlockSize);
-  if (val != -1 && (val < TSDB_MIN_CACHE_BLOCK_SIZE || val > TSDB_MAX_CACHE_BLOCK_SIZE)) {
-    snprintf(msg, tListLen(msg), "invalid db option cacheBlockSize: %d valid range: [%d, %d]", val,
-             TSDB_MIN_CACHE_BLOCK_SIZE, TSDB_MAX_CACHE_BLOCK_SIZE);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  if (pCreate->precision != TSDB_TIME_PRECISION_MILLI && pCreate->precision != TSDB_TIME_PRECISION_MICRO &&
-      pCreate->precision != TSDB_TIME_PRECISION_NANO) {
-    snprintf(msg, tListLen(msg), "invalid db option timePrecision: %d valid value: [%d, %d, %d]", pCreate->precision,
-             TSDB_TIME_PRECISION_MILLI, TSDB_TIME_PRECISION_MICRO, TSDB_TIME_PRECISION_NANO);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  val = htonl(pCreate->commitTime);
-  if (val != -1 && (val < TSDB_MIN_COMMIT_TIME || val > TSDB_MAX_COMMIT_TIME)) {
-    snprintf(msg, tListLen(msg), "invalid db option commitTime: %d valid range: [%d, %d]", val, TSDB_MIN_COMMIT_TIME,
-             TSDB_MAX_COMMIT_TIME);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  val = htonl(pCreate->fsyncPeriod);
-  if (val != -1 && (val < TSDB_MIN_FSYNC_PERIOD || val > TSDB_MAX_FSYNC_PERIOD)) {
-    snprintf(msg, tListLen(msg), "invalid db option fsyncPeriod: %d valid range: [%d, %d]", val, TSDB_MIN_FSYNC_PERIOD,
-             TSDB_MAX_FSYNC_PERIOD);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  if (pCreate->compression != -1 &&
-      (pCreate->compression < TSDB_MIN_COMP_LEVEL || pCreate->compression > TSDB_MAX_COMP_LEVEL)) {
-    snprintf(msg, tListLen(msg), "invalid db option compression: %d valid range: [%d, %d]", pCreate->compression,
-             TSDB_MIN_COMP_LEVEL, TSDB_MAX_COMP_LEVEL);
-    return buildInvalidOperationMsg(pMsgBuf, msg);
-  }
-
-  val = htonl(pCreate->numOfVgroups);
-  if (val < TSDB_MIN_VNODES_PER_DB || val > TSDB_MAX_VNODES_PER_DB) {
-    snprintf(msg, tListLen(msg), "invalid number of vgroups for DB:%d valid range: [%d, %d]", val,
-             TSDB_MIN_VNODES_PER_DB, TSDB_MAX_VNODES_PER_DB);
-  }
-
-  val = htonl(pCreate->maxRows);
-  if (val < TSDB_MIN_MAX_ROW_FBLOCK || val > TSDB_MAX_MAX_ROW_FBLOCK) {
-    snprintf(msg, tListLen(msg), "invalid number of max rows in file block for DB:%d valid range: [%d, %d]", val,
-             TSDB_MIN_MAX_ROW_FBLOCK, TSDB_MAX_MAX_ROW_FBLOCK);
-  }
-
-  val = htonl(pCreate->minRows);
-  if (val < TSDB_MIN_MIN_ROW_FBLOCK || val > TSDB_MAX_MIN_ROW_FBLOCK) {
-    snprintf(msg, tListLen(msg), "invalid number of min rows in file block for DB:%d valid range: [%d, %d]", val,
-             TSDB_MIN_MIN_ROW_FBLOCK, TSDB_MAX_MIN_ROW_FBLOCK);
-  }
-
-  return TSDB_CODE_SUCCESS;
-}
-
 static int32_t validateTableColumns(SArray* pFieldList, int32_t maxRowLength, int32_t maxColumns, SMsgBuf* pMsgBuf) {
   const char* msg2 = "row length exceeds max length";
   const char* msg3 = "duplicated column names";
@@ -852,11 +759,15 @@ SDclStmtInfo* qParserValidateDclSqlNode(SSqlInfo* pInfo, SParseContext* pCtx, ch
         goto _error;
       }
 
-      SUseDbReq* pUseDbMsg = (SUseDbReq*)calloc(1, sizeof(SUseDbReq));
-      tNameExtractFullName(&n, pUseDbMsg->db);
+      SUseDbReq usedbReq = {0};
+      tNameExtractFullName(&n, usedbReq.db);
 
-      pDcl->pMsg = (char*)pUseDbMsg;
-      pDcl->msgLen = sizeof(SUseDbReq);
+      int32_t bufLen = tSerializeSUseDbReq(NULL, 0, &usedbReq);
+      void*   pBuf = malloc(bufLen);
+      tSerializeSUseDbReq(pBuf, bufLen, &usedbReq);
+
+      pDcl->pMsg = pBuf;
+      pDcl->msgLen = bufLen;
       pDcl->msgType = TDMT_MND_USE_DB;
       break;
     }
@@ -880,14 +791,11 @@ SDclStmtInfo* qParserValidateDclSqlNode(SSqlInfo* pInfo, SParseContext* pCtx, ch
         goto _error;
       }
 
-      SCreateDbReq* pCreateMsg = buildCreateDbMsg(pCreateDB, pCtx, pMsgBuf);
-      if (doCheckDbOptions(pCreateMsg, pMsgBuf) != TSDB_CODE_SUCCESS) {
-        code = TSDB_CODE_TSC_INVALID_OPERATION;
-        goto _error;
-      }
+      int32_t bufLen = 0;
+      char*   pBuf = buildCreateDbMsg(pCreateDB, &bufLen, pCtx, pMsgBuf);
 
-      pDcl->pMsg = (char*)pCreateMsg;
-      pDcl->msgLen = sizeof(SCreateDbReq);
+      pDcl->pMsg = pBuf;
+      pDcl->msgLen = bufLen;
       pDcl->msgType = (pInfo->type == TSDB_SQL_CREATE_DB) ? TDMT_MND_CREATE_DB : TDMT_MND_ALTER_DB;
       break;
     }
@@ -905,15 +813,18 @@ SDclStmtInfo* qParserValidateDclSqlNode(SSqlInfo* pInfo, SParseContext* pCtx, ch
         goto _error;
       }
 
-      SDropDbReq* pDropDbMsg = (SDropDbReq*)calloc(1, sizeof(SDropDbReq));
-
-      code = tNameExtractFullName(&name, pDropDbMsg->db);
-      pDropDbMsg->ignoreNotExists = pInfo->pMiscInfo->existsCheck ? 1 : 0;
+      SDropDbReq dropdbReq = {0};
+      code = tNameExtractFullName(&name, dropdbReq.db);
+      dropdbReq.ignoreNotExists = pInfo->pMiscInfo->existsCheck ? 1 : 0;
       assert(code == TSDB_CODE_SUCCESS && name.type == TSDB_DB_NAME_T);
 
+      int32_t bufLen = tSerializeSDropDbReq(NULL, 0, &dropdbReq);
+      void*   pBuf = malloc(bufLen);
+      tSerializeSDropDbReq(pBuf, bufLen, &dropdbReq);
+
       pDcl->msgType = TDMT_MND_DROP_DB;
-      pDcl->msgLen = sizeof(SDropDbReq);
-      pDcl->pMsg = (char*)pDropDbMsg;
+      pDcl->msgLen = bufLen;
+      pDcl->pMsg = pBuf;
       break;
     }
 
diff --git a/source/libs/qcom/src/querymsg.c b/source/libs/qcom/src/querymsg.c
index 4acfb6239b..53ee288930 100644
--- a/source/libs/qcom/src/querymsg.c
+++ b/source/libs/qcom/src/querymsg.c
@@ -55,32 +55,26 @@ 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) {
+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;
+  SBuildUseDBInput *bInput = input;
 
-  int32_t estimateSize = sizeof(SUseDbReq);
-  if (NULL == *msg || msgSize < estimateSize) {
-    tfree(*msg);
-    *msg = rpcMallocCont(estimateSize);
-    if (NULL == *msg) {
-      return TSDB_CODE_TSC_OUT_OF_MEMORY;
-    }
-  }
+  SUseDbReq usedbReq = {0};
+  strncpy(usedbReq.db, bInput->db, sizeof(usedbReq.db));
+  usedbReq.db[sizeof(usedbReq.db) - 1] = 0;
+  usedbReq.vgVersion = bInput->vgVersion;
 
-  SUseDbReq *bMsg = (SUseDbReq *)*msg;
+  int32_t bufLen = tSerializeSUseDbReq(NULL, 0, &usedbReq);
+  void   *pBuf = rpcMallocCont(bufLen);
+  tSerializeSUseDbReq(pBuf, bufLen, &usedbReq);
 
-  strncpy(bMsg->db, bInput->db, sizeof(bMsg->db));
-  bMsg->db[sizeof(bMsg->db) - 1] = 0;
+  *msg = pBuf;
+  *msgLen = bufLen;
 
-  bMsg->vgVersion = bInput->vgVersion;
-
-  *msgLen = (int32_t)sizeof(*bMsg);
-
-  return TSDB_CODE_SUCCESS;  
+  return TSDB_CODE_SUCCESS;
 }
 
 int32_t queryProcessUseDBRsp(void *output, char *msg, int32_t msgSize) {
@@ -133,7 +127,7 @@ int32_t queryProcessUseDBRsp(void *output, char *msg, int32_t msgSize) {
   return code;
 
 _return:
-  taosArrayDestroy(usedbRsp.pVgroupInfos);
+  tFreeSUsedbRsp(&usedbRsp);
 
   if (pOut) {
     taosHashCleanup(pOut->dbVgroup->vgHash);