diff --git a/src/mnode/inc/mgmtDef.h b/src/mnode/inc/mgmtDef.h
index 34249d3f00cddfca1c73df0732386ba08c6a832f..f6a85ec237751dda77a46a97abc9edb9c3861c7e 100644
--- a/src/mnode/inc/mgmtDef.h
+++ b/src/mnode/inc/mgmtDef.h
@@ -32,8 +32,8 @@ struct SMnodeObj;
 typedef struct SDnodeObj {
   int32_t    dnodeId;
   uint16_t   dnodePort;
-  char       dnodeFqdn[TSDB_FQDN_LEN];
-  char       dnodeEp[TSDB_FQDN_LEN];
+  char       dnodeFqdn[TSDB_FQDN_LEN + 1];
+  char       dnodeEp[TSDB_FQDN_LEN + 1];
   int64_t    createdTime;
   uint32_t   lastAccess;
   int32_t    openVnodes;
@@ -96,7 +96,7 @@ typedef struct {
   int32_t    numOfColumns; //used by normal table
   int32_t    sid;
   int32_t    vgId;
-  char       superTableId[TSDB_TABLE_ID_LEN + 1];
+  uint64_t   suid;
   int32_t    sqlLen;
   int8_t     reserved[1]; 
   int8_t     updateEnd[1];
diff --git a/src/mnode/src/mgmtTable.c b/src/mnode/src/mgmtTable.c
index a1d260d1cf1d86d2e92ebefe8ce5dd331c9e9d1f..6ed19b3d1146e8478ff7cc2f84121b55e5396433 100644
--- a/src/mnode/src/mgmtTable.c
+++ b/src/mnode/src/mgmtTable.c
@@ -47,6 +47,7 @@ static int32_t tsChildTableUpdateSize;
 static int32_t tsSuperTableUpdateSize;
 static void *  mgmtGetChildTable(char *tableId);
 static void *  mgmtGetSuperTable(char *tableId);
+static void *  mgmtGetSuperTableByUid(uint64_t uid);
 static void    mgmtDropAllChildTablesInStable(SSuperTableObj *pStable);
 static void    mgmtAddTableIntoStable(SSuperTableObj *pStable, SChildTableObj *pCtable);
 static void    mgmtRemoveTableFromStable(SSuperTableObj *pStable, SChildTableObj *pCtable);
@@ -118,7 +119,7 @@ static int32_t mgmtChildTableActionInsert(SSdbOper *pOper) {
 
   if (pTable->info.type == TSDB_CHILD_TABLE) {
     // add ref
-    pTable->superTable = mgmtGetSuperTable(pTable->superTableId);
+    pTable->superTable = mgmtGetSuperTableByUid(pTable->suid);
     mgmtAddTableIntoStable(pTable->superTable, pTable);
     grantAdd(TSDB_GRANT_TIMESERIES, pTable->superTable->numOfColumns - 1);
     pAcct->acctInfo.numOfTimeSeries += (pTable->superTable->numOfColumns - 1);
@@ -308,9 +309,9 @@ static int32_t mgmtChildTableActionRestored() {
     }
 
     if (pTable->info.type == TSDB_CHILD_TABLE) {
-      SSuperTableObj *pSuperTable = mgmtGetSuperTable(pTable->superTableId);
+      SSuperTableObj *pSuperTable = mgmtGetSuperTableByUid(pTable->suid);
       if (pSuperTable == NULL) {
-        mError("ctable:%s, stable:%s not exist", pTable->info.tableId, pTable->superTableId);
+        mError("ctable:%s, stable:%" PRIu64 " not exist", pTable->info.tableId, pTable->suid);
         pTable->vgId = 0;
         SSdbOper desc = {0};
         desc.type = SDB_OPER_LOCAL;
@@ -560,6 +561,22 @@ static void *mgmtGetSuperTable(char *tableId) {
   return sdbGetRow(tsSuperTableSdb, tableId);
 }
 
+static void *mgmtGetSuperTableByUid(uint64_t uid) {
+  SSuperTableObj *pStable = NULL;
+  void *          pNode = NULL;
+
+  while (1) {
+    pNode = mgmtGetNextSuperTable(pNode, &pStable);
+    if (pStable == NULL) break;
+    if (pStable->uid == uid) {
+      return pStable;
+    }
+    mgmtDecTableRef(pStable);
+  }
+
+  return NULL;
+}
+
 void *mgmtGetTable(char *tableId) {
   void *pTable = mgmtGetSuperTable(tableId);
   if (pTable != NULL) {
@@ -1358,10 +1375,10 @@ static SChildTableObj* mgmtDoCreateChildTable(SCMCreateTableMsg *pCreate, SVgObj
     }
     mgmtDecTableRef(pSuperTable);
 
-    strcpy(pTable->superTableId, pSuperTable->info.tableId);
-    pTable->uid         = (((uint64_t) pTable->vgId) << 40) + ((((uint64_t) pTable->sid) & ((1ul << 24) - 1ul)) << 16) +
-                          (sdbGetVersion() & ((1ul << 16) - 1ul));
-    pTable->superTable  = pSuperTable;
+    pTable->suid = pSuperTable->uid;
+    pTable->uid  = (((uint64_t)pTable->vgId) << 40) + ((((uint64_t)pTable->sid) & ((1ul << 24) - 1ul)) << 16) +
+                  (sdbGetVersion() & ((1ul << 16) - 1ul));
+    pTable->superTable = pSuperTable;
   } else {
     pTable->uid          = (((uint64_t) pTable->createdTime) << 16) + (sdbGetVersion() & ((1ul << 16) - 1ul));
     pTable->sversion     = 0;
@@ -2073,7 +2090,7 @@ static int32_t mgmtRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows,
 
     pWrite = data + pShow->offset[cols] * rows + pShow->bytes[cols] * numOfRows;
     if (pTable->info.type == TSDB_CHILD_TABLE) {
-      mgmtExtractTableName(pTable->superTableId, pWrite);
+      mgmtExtractTableName(pTable->superTable->info.tableId, pWrite);
     }
     cols++;