diff --git a/src/mnode/inc/mnodeSdb.h b/src/mnode/inc/mnodeSdb.h
index 81629ede785a7d9448c3e923971693ea3e31d34b..90c4eac40a925ece5b6ab11d89df50ecaf927aed 100644
--- a/src/mnode/inc/mnodeSdb.h
+++ b/src/mnode/inc/mnodeSdb.h
@@ -79,10 +79,13 @@ typedef struct {
   int32_t (*fpRestored)();
 } SSdbTableDesc;
 
+int32_t sdbInitRef();
+void    sdbCleanUpRef();
 int32_t sdbInit();
 void    sdbCleanUp();
-void *  sdbOpenTable(SSdbTableDesc *desc);
-void    sdbCloseTable(void *handle);
+int64_t sdbOpenTable(SSdbTableDesc *desc);
+void    sdbCloseTable(int64_t rid);
+void*   sdbGetTableByRid(int64_t rid);
 bool    sdbIsMaster();
 bool    sdbIsServing();
 void    sdbUpdateMnodeRoles();
diff --git a/src/mnode/src/mnodeAcct.c b/src/mnode/src/mnodeAcct.c
index 3da889b28443a71d85bc7067c14d3a0c8d308dc7..6fba05674fadbe967a673bbc0cc6e02ad7f2b41a 100644
--- a/src/mnode/src/mnodeAcct.c
+++ b/src/mnode/src/mnodeAcct.c
@@ -26,6 +26,7 @@
 #include "mnodeUser.h"
 #include "mnodeVgroup.h"
 
+int64_t tsAcctRid = -1;
 void *  tsAcctSdb = NULL;
 static int32_t tsAcctUpdateSize;
 static int32_t mnodeCreateRootAcct();
@@ -114,7 +115,8 @@ int32_t mnodeInitAccts() {
     .fpRestored   = mnodeAcctActionRestored
   };
 
-  tsAcctSdb = sdbOpenTable(&desc);
+  tsAcctRid = sdbOpenTable(&desc);
+  tsAcctSdb = sdbGetTableByRid(tsAcctRid);
   if (tsAcctSdb == NULL) {
     mError("table:%s, failed to create hash", desc.name);
     return -1;
@@ -126,7 +128,7 @@ int32_t mnodeInitAccts() {
 
 void mnodeCleanupAccts() {
   acctCleanUp();
-  sdbCloseTable(tsAcctSdb);
+  sdbCloseTable(tsAcctRid);
   tsAcctSdb = NULL;
 }
 
diff --git a/src/mnode/src/mnodeCluster.c b/src/mnode/src/mnodeCluster.c
index 839407c5b02fc4e0af84bebf3c792860b75406ce..56229daffa87d3300cc597d9353b5a720751a0f9 100644
--- a/src/mnode/src/mnodeCluster.c
+++ b/src/mnode/src/mnodeCluster.c
@@ -24,6 +24,7 @@
 #include "mnodeShow.h"
 #include "tglobal.h"
 
+int64_t        tsClusterRid = -1;
 static void *  tsClusterSdb = NULL;
 static int32_t tsClusterUpdateSize;
 static char    tsClusterId[TSDB_CLUSTER_ID_LEN];
@@ -101,9 +102,10 @@ int32_t mnodeInitCluster() {
     .fpRestored   = mnodeClusterActionRestored
   };
 
-  tsClusterSdb = sdbOpenTable(&desc);
+  tsClusterRid = sdbOpenTable(&desc);
+  tsClusterSdb = sdbGetTableByRid(tsClusterRid);
   if (tsClusterSdb == NULL) {
-    mError("table:%s, failed to create hash", desc.name);
+    mError("table:%s, rid:%" PRId64 ", failed to create hash", desc.name, tsClusterRid);
     return -1;
   }
 
@@ -116,7 +118,7 @@ int32_t mnodeInitCluster() {
 }
 
 void mnodeCleanupCluster() {
-  sdbCloseTable(tsClusterSdb);
+  sdbCloseTable(tsClusterRid);
   tsClusterSdb = NULL;
 }
 
diff --git a/src/mnode/src/mnodeDb.c b/src/mnode/src/mnodeDb.c
index 77f3b93eb1825bed7fdb9165f130b3d0fd3a06d5..999c606284e0710579b97fdaf74b773a55bac4fc 100644
--- a/src/mnode/src/mnodeDb.c
+++ b/src/mnode/src/mnodeDb.c
@@ -38,6 +38,7 @@
 #include "mnodeVgroup.h"
 
 #define VG_LIST_SIZE 8
+int64_t        tsDbRid = -1;
 static void *  tsDbSdb = NULL;
 static int32_t tsDbUpdateSize;
 
@@ -160,7 +161,8 @@ int32_t mnodeInitDbs() {
     .fpRestored   = mnodeDbActionRestored
   };
 
-  tsDbSdb = sdbOpenTable(&desc);
+  tsDbRid = sdbOpenTable(&desc);
+  tsDbSdb = sdbGetTableByRid(tsDbRid);
   if (tsDbSdb == NULL) {
     mError("failed to init db data");
     return -1;
@@ -496,7 +498,7 @@ void mnodeRemoveVgroupFromDb(SVgObj *pVgroup) {
 }
 
 void mnodeCleanupDbs() {
-  sdbCloseTable(tsDbSdb);
+  sdbCloseTable(tsDbRid);
   tsDbSdb = NULL;
 }
 
diff --git a/src/mnode/src/mnodeDnode.c b/src/mnode/src/mnodeDnode.c
index 0e9b56e45961d1d2f9f4fc5ee0f78a95edb2cd61..65f40603923082a9ddebee8dd27f53135a942f5c 100644
--- a/src/mnode/src/mnodeDnode.c
+++ b/src/mnode/src/mnodeDnode.c
@@ -39,6 +39,7 @@
 #include "mnodeCluster.h"
 
 int32_t tsAccessSquence = 0;
+int64_t        tsDnodeRid = -1;
 static void *  tsDnodeSdb = NULL;
 static int32_t tsDnodeUpdateSize = 0;
 extern void *  tsMnodeSdb;
@@ -187,7 +188,8 @@ int32_t mnodeInitDnodes() {
     .fpRestored   = mnodeDnodeActionRestored
   };
 
-  tsDnodeSdb = sdbOpenTable(&desc);
+  tsDnodeRid = sdbOpenTable(&desc);
+  tsDnodeSdb = sdbGetTableByRid(tsDnodeRid);
   if (tsDnodeSdb == NULL) {
     mError("failed to init dnodes data");
     return -1;
@@ -213,7 +215,7 @@ int32_t mnodeInitDnodes() {
 }
 
 void mnodeCleanupDnodes() {
-  sdbCloseTable(tsDnodeSdb);
+  sdbCloseTable(tsDnodeRid);
   pthread_mutex_destroy(&tsDnodeEpsMutex);
   free(tsDnodeEps);
   tsDnodeEps = NULL;
diff --git a/src/mnode/src/mnodeMain.c b/src/mnode/src/mnodeMain.c
index 1f5ad42bdead75064c60f8626ce4916e7b08fd9f..d15b32da54d245b08146703aaed08a5b43ce8170 100644
--- a/src/mnode/src/mnodeMain.c
+++ b/src/mnode/src/mnodeMain.c
@@ -47,6 +47,7 @@ void *tsMnodeTmr = NULL;
 static bool tsMgmtIsRunning = false;
 
 static const SMnodeComponent tsMnodeComponents[] = {
+  {"sdbref",  sdbInitRef,       sdbCleanUpRef},
   {"profile", mnodeInitProfile, mnodeCleanupProfile},
   {"cluster", mnodeInitCluster, mnodeCleanupCluster},
   {"accts",   mnodeInitAccts,   mnodeCleanupAccts},
diff --git a/src/mnode/src/mnodeMnode.c b/src/mnode/src/mnodeMnode.c
index 294b1ced12dbd1b83c497b2bc6d75458f2081ad7..7428e8d2c8b1cdbde3c0c187f37b0fb3f6444ed0 100644
--- a/src/mnode/src/mnodeMnode.c
+++ b/src/mnode/src/mnodeMnode.c
@@ -34,6 +34,7 @@
 #include "mnodeUser.h"
 #include "mnodeVgroup.h"
 
+int64_t              tsMnodeRid = -1;
 static void *        tsMnodeSdb = NULL;
 static int32_t       tsMnodeUpdateSize = 0;
 static SRpcEpSet     tsMnodeEpSetForShell;
@@ -153,7 +154,8 @@ int32_t mnodeInitMnodes() {
     .fpRestored   = mnodeMnodeActionRestored
   };
 
-  tsMnodeSdb = sdbOpenTable(&desc);
+  tsMnodeRid = sdbOpenTable(&desc);
+  tsMnodeSdb = sdbGetTableByRid(tsMnodeRid);
   if (tsMnodeSdb == NULL) {
     mError("failed to init mnodes data");
     return -1;
@@ -168,7 +170,7 @@ int32_t mnodeInitMnodes() {
 }
 
 void mnodeCleanupMnodes() {
-  sdbCloseTable(tsMnodeSdb);
+  sdbCloseTable(tsMnodeRid);
   tsMnodeSdb = NULL;
   mnodeMnodeDestroyLock();
 }
diff --git a/src/mnode/src/mnodeProfile.c b/src/mnode/src/mnodeProfile.c
index 8467adfc17924f2d3df3d6e079ac4a71078f1412..36b6ff7a59fc1f1c73e64c40ff3a5a1cef65ece6 100644
--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@@ -34,7 +34,6 @@
 #define QUERY_ID_SIZE   20
 #define QUERY_STREAM_SAVE_SIZE 20
 
-extern void *tsMnodeTmr;
 static SCacheObj *tsMnodeConnCache = NULL;
 static int32_t tsConnIndex = 0;
 
diff --git a/src/mnode/src/mnodeSdb.c b/src/mnode/src/mnodeSdb.c
index 6aa17472a186c489a11f7a716cd8f9b9ee8931a0..6670e87a7cc6a91f53f7c834c85fc6f5eeb0d457 100644
--- a/src/mnode/src/mnodeSdb.c
+++ b/src/mnode/src/mnodeSdb.c
@@ -18,6 +18,7 @@
 #include "taoserror.h"
 #include "hash.h"
 #include "tutil.h"
+#include "tref.h"
 #include "tbalance.h"
 #include "tqueue.h"
 #include "twal.h"
@@ -98,6 +99,7 @@ typedef struct {
   SSdbWorker *worker;
 } SSdbWorkerPool;
 
+int32_t tsSdbRid;
 extern void *     tsMnodeTmr;
 static void *     tsSdbTmr;
 static SSdbMgmt   tsSdbMgmt = {0};
@@ -118,6 +120,7 @@ static void    sdbFreeQueue();
 static int32_t sdbInsertHash(SSdbTable *pTable, SSdbRow *pRow);
 static int32_t sdbUpdateHash(SSdbTable *pTable, SSdbRow *pRow);
 static int32_t sdbDeleteHash(SSdbTable *pTable, SSdbRow *pRow);
+static void    sdbCloseTableObj(void *handle);
 
 int32_t sdbGetId(void *pTable) {
   return ((SSdbTable *)pTable)->autoIndex;
@@ -385,6 +388,17 @@ void sdbUpdateSync(void *pMnodes) {
   sdbUpdateMnodeRoles();
 }
 
+int32_t sdbInitRef() {
+  tsSdbRid = taosOpenRef(10, sdbCloseTableObj);
+  if (tsSdbRid <= 0) {
+    sdbError("failed to init sdb ref");
+    return -1;
+  }
+  return 0;
+}
+
+void sdbCleanUpRef() { taosCloseRef(tsSdbRid); }
+
 int32_t sdbInit() {
   pthread_mutex_init(&tsSdbMgmt.mutex, NULL);
 
@@ -423,7 +437,7 @@ void sdbCleanUp() {
     walClose(tsSdbMgmt.wal);
     tsSdbMgmt.wal = NULL;
   }
-  
+
   pthread_mutex_destroy(&tsSdbMgmt.mutex);
 }
 
@@ -801,10 +815,10 @@ void sdbFreeIter(void *tparam, void *pIter) {
   taosHashCancelIterate(pTable->iHandle, pIter);
 }
 
-void *sdbOpenTable(SSdbTableDesc *pDesc) {
+int64_t sdbOpenTable(SSdbTableDesc *pDesc) {
   SSdbTable *pTable = (SSdbTable *)calloc(1, sizeof(SSdbTable));
   
-  if (pTable == NULL) return NULL;
+  if (pTable == NULL) return -1;
 
   pthread_mutex_init(&pTable->mutex, NULL);
   tstrncpy(pTable->name, pDesc->name, SDB_TABLE_LEN);
@@ -829,10 +843,21 @@ void *sdbOpenTable(SSdbTableDesc *pDesc) {
 
   tsSdbMgmt.numOfTables++;
   tsSdbMgmt.tableList[pTable->id] = pTable;
-  return pTable;
+
+  return taosAddRef(tsSdbRid, pTable);
+}
+
+void sdbCloseTable(int64_t rid) {
+  taosRemoveRef(tsSdbRid, rid);
+}
+
+void *sdbGetTableByRid(int64_t rid) {
+  void *handle = taosAcquireRef(tsSdbRid, rid);
+  taosReleaseRef(tsSdbRid, rid);
+  return handle;
 }
 
-void sdbCloseTable(void *handle) {
+static void sdbCloseTableObj(void *handle) {
   SSdbTable *pTable = (SSdbTable *)handle;
   if (pTable == NULL) return;
   
diff --git a/src/mnode/src/mnodeShow.c b/src/mnode/src/mnodeShow.c
index 2621441cb5451383a6f96ca05c550de3db1db484..2da46d5b4bd01d47794b0e77011101ce7dc137cc 100644
--- a/src/mnode/src/mnodeShow.c
+++ b/src/mnode/src/mnodeShow.c
@@ -52,7 +52,6 @@ static bool  mnodeCheckShowFinished(SShowObj *pShow);
 static void *mnodePutShowObj(SShowObj *pShow);
 static void  mnodeReleaseShowObj(SShowObj *pShow, bool forceRemove);
 
-extern void *tsMnodeTmr;
 static void *tsMnodeShowCache = NULL;
 static int32_t tsShowObjIndex = 0;
 static SShowMetaFp     tsMnodeShowMetaFp[TSDB_MGMT_TABLE_MAX]     = {0};
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index cc7ffb81ad47d93fce958a9bf7760d45e2a0e40a..2149cb12c0471e747a340a09d869ff6784fc9ccf 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -49,7 +49,9 @@
 #define CREATE_CTABLE_RETRY_TIMES 10
 #define CREATE_CTABLE_RETRY_SEC   14
 
+int64_t        tsCTableRid = -1;
 static void *  tsChildTableSdb;
+int64_t        tsSTableRid = -1;
 static void *  tsSuperTableSdb;
 static int32_t tsChildTableUpdateSize;
 static int32_t tsSuperTableUpdateSize;
@@ -350,7 +352,7 @@ static int32_t mnodeInitChildTables() {
   SCTableObj tObj;
   tsChildTableUpdateSize = (int8_t *)tObj.updateEnd - (int8_t *)&tObj.info.type;
 
-  SSdbTableDesc tableDesc = {
+  SSdbTableDesc desc = {
     .id           = SDB_TABLE_CTABLE,
     .name         = "ctables",
     .hashSessions = TSDB_DEFAULT_CTABLES_HASH_SIZE,
@@ -366,7 +368,8 @@ static int32_t mnodeInitChildTables() {
     .fpRestored   = mnodeChildTableActionRestored
   };
 
-  tsChildTableSdb = sdbOpenTable(&tableDesc);
+  tsCTableRid = sdbOpenTable(&desc);
+  tsChildTableSdb = sdbGetTableByRid(tsCTableRid);
   if (tsChildTableSdb == NULL) {
     mError("failed to init child table data");
     return -1;
@@ -377,7 +380,7 @@ static int32_t mnodeInitChildTables() {
 }
 
 static void mnodeCleanupChildTables() {
-  sdbCloseTable(tsChildTableSdb);
+  sdbCloseTable(tsCTableRid);
   tsChildTableSdb = NULL;
 }
 
@@ -543,7 +546,7 @@ static int32_t mnodeInitSuperTables() {
   SSTableObj tObj;
   tsSuperTableUpdateSize = (int8_t *)tObj.updateEnd - (int8_t *)&tObj.info.type;
 
-  SSdbTableDesc tableDesc = {
+  SSdbTableDesc desc = {
     .id           = SDB_TABLE_STABLE,
     .name         = "stables",
     .hashSessions = TSDB_DEFAULT_STABLES_HASH_SIZE,
@@ -559,7 +562,8 @@ static int32_t mnodeInitSuperTables() {
     .fpRestored   = mnodeSuperTableActionRestored
   };
 
-  tsSuperTableSdb = sdbOpenTable(&tableDesc);
+  tsSTableRid = sdbOpenTable(&desc);
+  tsSuperTableSdb = sdbGetTableByRid(tsSTableRid);
   if (tsSuperTableSdb == NULL) {
     mError("failed to init stables data");
     return -1;
@@ -570,7 +574,7 @@ static int32_t mnodeInitSuperTables() {
 }
 
 static void mnodeCleanupSuperTables() {
-  sdbCloseTable(tsSuperTableSdb);
+  sdbCloseTable(tsSTableRid);
   tsSuperTableSdb = NULL;
 }
 
diff --git a/src/mnode/src/mnodeUser.c b/src/mnode/src/mnodeUser.c
index aee167631f8aba1360733a88123b042ffbce5771..fb26086d0433d7760c9cc7ed906abb570a4fcfee 100644
--- a/src/mnode/src/mnodeUser.c
+++ b/src/mnode/src/mnodeUser.c
@@ -33,6 +33,7 @@
 #include "mnodeWrite.h"
 #include "mnodePeer.h"
 
+int64_t        tsUserRid = -1;
 static void *  tsUserSdb = NULL;
 static int32_t tsUserUpdateSize = 0;
 static int32_t mnodeGetUserMeta(STableMetaMsg *pMeta, SShowObj *pShow, void *pConn);
@@ -165,7 +166,8 @@ int32_t mnodeInitUsers() {
     .fpRestored   = mnodeUserActionRestored
   };
 
-  tsUserSdb = sdbOpenTable(&desc);
+  tsUserRid = sdbOpenTable(&desc);
+  tsUserSdb = sdbGetTableByRid(tsUserRid);
   if (tsUserSdb == NULL) {
     mError("table:%s, failed to create hash", desc.name);
     return -1;
@@ -185,7 +187,7 @@ int32_t mnodeInitUsers() {
 }
 
 void mnodeCleanupUsers() {
-  sdbCloseTable(tsUserSdb);
+  sdbCloseTable(tsUserRid);
   tsUserSdb = NULL;
 }
 
diff --git a/src/mnode/src/mnodeVgroup.c b/src/mnode/src/mnodeVgroup.c
index a8343083aa3346cd0bbfa5fc244c765285bce057..3e974f417ff09f4663e25c6c62d1d341457285ff 100644
--- a/src/mnode/src/mnodeVgroup.c
+++ b/src/mnode/src/mnodeVgroup.c
@@ -51,6 +51,7 @@ char* vgroupStatus[] = {
   "updating"
 };
 
+int64_t        tsVgroupRid = -1;
 static void   *tsVgroupSdb = NULL;
 static int32_t tsVgUpdateSize = 0;
 
@@ -222,7 +223,8 @@ int32_t mnodeInitVgroups() {
     .fpRestored   = mnodeVgroupActionRestored,
   };
 
-  tsVgroupSdb = sdbOpenTable(&desc);
+  tsVgroupRid = sdbOpenTable(&desc);
+  tsVgroupSdb = sdbGetTableByRid(tsVgroupRid);
   if (tsVgroupSdb == NULL) {
     mError("failed to init vgroups data");
     return -1;
@@ -610,7 +612,7 @@ void mnodeDropVgroup(SVgObj *pVgroup, void *ahandle) {
 }
 
 void mnodeCleanupVgroups() {
-  sdbCloseTable(tsVgroupSdb);
+  sdbCloseTable(tsVgroupRid);
   tsVgroupSdb = NULL;
 }