diff --git a/src/inc/tutil.h b/src/inc/tutil.h
index f63f8b6cec6d8d5c5f610e23126c7d8fa6cf8c5f..884e448aae5b6b0096c4ca4eb481c773f6de7162 100644
--- a/src/inc/tutil.h
+++ b/src/inc/tutil.h
@@ -169,8 +169,6 @@ int32_t taosInitTimer(void (*callback)(int), int32_t ms);
  */
 uint32_t MurmurHash3_32(const void *key, int32_t len);
 
-bool taosCheckDbName(char *db, char *monitordb);
-
 bool taosMbsToUcs4(char *mbs, int32_t mbs_len, char *ucs4, int32_t ucs4_max_len);
 
 bool taosUcs4ToMbs(void *ucs4, int32_t ucs4_max_len, char *mbs);
diff --git a/src/system/detail/inc/mgmtUtil.h b/src/system/detail/inc/mgmtUtil.h
index aecb229dba3024c712b82d8dafab7a0dbbf146e7..6a6b819bf2b8cf17c52f404fd2c2d66b65e20876 100644
--- a/src/system/detail/inc/mgmtUtil.h
+++ b/src/system/detail/inc/mgmtUtil.h
@@ -30,6 +30,7 @@ char*   mgmtMeterGetTag(STabObj* pMeter, int32_t col, SSchema* pTagColSchema);
 int32_t mgmtFindTagCol(STabObj * pMetric, const char * tagName);
 
 int32_t mgmtGetTagsLength(STabObj* pMetric, int32_t col);
+bool mgmtCheckIsMonitorDB(char *db, char *monitordb);
 
 int32_t mgmtRetrieveMetersFromMetric(SMetricMetaMsg* pInfo, int32_t tableIndex, tQueryResultset* pRes);
 int32_t mgmtDoJoin(SMetricMetaMsg* pMetricMetaMsg, tQueryResultset* pRes);
diff --git a/src/system/detail/src/mgmtDb.c b/src/system/detail/src/mgmtDb.c
index ae4c5bed7ce86b712c0886b98b9cf2e5118899f6..93ff1279c0ea4af2be5050a3c38825e47f39b3e8 100644
--- a/src/system/detail/src/mgmtDb.c
+++ b/src/system/detail/src/mgmtDb.c
@@ -14,9 +14,11 @@
  */
 
 #define _DEFAULT_SOURCE
+#include "os.h"
+
 #include "mgmt.h"
-#include <arpa/inet.h>
 #include "mgmtBalance.h"
+#include "mgmtUtil.h"
 #include "tschemautil.h"
 
 void *dbSdb = NULL;
@@ -373,10 +375,18 @@ int mgmtDropDbByName(SAcctObj *pAcct, char *name) {
   if (pDb == NULL) {
     mWarn("db:%s is not there", name);
     // return TSDB_CODE_INVALID_DB;
-    return 0;
+    return TSDB_CODE_SUCCESS;
   }
 
-  if (taosCheckDbName(pDb->name, tsMonitorDbName)) return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+//  char dbName[TSDB_DB_NAME_LEN + 1] = {0};
+//  extractDBName(pDb->name, dbName);
+//  if (strncasecmp(dbName, tsMonitorDbName, strlen(dbName)) == 0) {
+//    return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+//  }
+
+  if (mgmtCheckIsMonitorDB(pDb->name, tsMonitorDbName)) {
+    return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+  }
 
   return mgmtDropDb(pDb);
 }
diff --git a/src/system/detail/src/mgmtMeter.c b/src/system/detail/src/mgmtMeter.c
index 2692e39131256ac718e3b4435457fba1c84b1c11..2db920fdd71a6005d45d442aff4c108a31dc9c72 100644
--- a/src/system/detail/src/mgmtMeter.c
+++ b/src/system/detail/src/mgmtMeter.c
@@ -688,8 +688,10 @@ int mgmtDropMeter(SDbObj *pDb, char *meterId, int ignore) {
 
   pAcct = mgmtGetAcct(pDb->cfg.acct);
 
-  // 0.sys
-  if (taosCheckDbName(pDb->name, tsMonitorDbName)) return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+  // 0.log
+  if (mgmtCheckIsMonitorDB(pDb->name, tsMonitorDbName)) {
+    return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+  }
 
   if (mgmtIsNormalMeter(pMeter)) {
     return dropMeterImp(pDb, pMeter, pAcct);
@@ -719,8 +721,8 @@ int mgmtAlterMeter(SDbObj *pDb, SAlterTableMsg *pAlter) {
     return TSDB_CODE_INVALID_TABLE;
   }
 
-  // 0.sys
-  if (taosCheckDbName(pDb->name, tsMonitorDbName)) return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
+  // 0.log
+  if (mgmtCheckIsMonitorDB(pDb->name, tsMonitorDbName)) return TSDB_CODE_MONITOR_DB_FORBEIDDEN;
 
   if (pAlter->type == TSDB_ALTER_TABLE_UPDATE_TAG_VAL) {
     if (!mgmtIsNormalMeter(pMeter) || !mgmtMeterCreateFromMetric(pMeter)) {
diff --git a/src/system/detail/src/mgmtUtil.c b/src/system/detail/src/mgmtUtil.c
index a427771e0f900c3a19bb13dbc45897b3190d7f15..be90180f681be75396c208ce078c9025c687d286 100644
--- a/src/system/detail/src/mgmtUtil.c
+++ b/src/system/detail/src/mgmtUtil.c
@@ -87,3 +87,10 @@ int32_t mgmtGetTagsLength(STabObj* pMetric, int32_t col) {  // length before col
 
   return len;
 }
+
+bool mgmtCheckIsMonitorDB(char *db, char *monitordb) {
+  char dbName[TSDB_DB_NAME_LEN + 1] = {0};
+  extractDBName(db, dbName);
+
+  return (strncasecmp(dbName, monitordb, strlen(dbName)) == 0);
+}
diff --git a/src/util/src/tutil.c b/src/util/src/tutil.c
index 805f27a3813fccbe36a26aa47358a01ee22f9c33..0d1ea9ed50cb1b4736ba5e713f014a562b59875b 100644
--- a/src/util/src/tutil.c
+++ b/src/util/src/tutil.c
@@ -406,13 +406,6 @@ int32_t taosFileRename(char *fullPath, char *suffix, char delimiter, char **dstP
   return rename(fullPath, *dstPath);
 }
 
-bool taosCheckDbName(char *db, char *monitordb) {
-  char *pos = strchr(db, '.');
-  if (pos == NULL) return false;
-
-  return strncasecmp(pos + 1, monitordb, strlen(monitordb)) == 0;
-}
-
 bool taosUcs4ToMbs(void *ucs4, int32_t ucs4_max_len, char *mbs) {
 #ifdef USE_LIBICONV
   iconv_t cd = iconv_open(tsCharset, DEFAULT_UNICODE_ENCODEC);