diff --git a/src/common/inc/tname.h b/src/common/inc/tname.h
index 6c48ca72f3b5ea010c662faa09211afd40152615..213aef1bd8c7301acb4be4fc75a0f1d2943b948d 100644
--- a/src/common/inc/tname.h
+++ b/src/common/inc/tname.h
@@ -25,6 +25,8 @@ void extractTableName(const char *tableId, char *name);
 
 char* extractDBName(const char *tableId, char *name);
 
+int32_t tableIdPrefix(const char* pDb, char* prefix, int32_t len);
+
 void extractTableNameFromToken(SStrToken *pToken, SStrToken* pTable);
 
 SSchema tGetTableNameColumnSchema();
diff --git a/src/common/src/tname.c b/src/common/src/tname.c
index bea8c52ef21ea607bee5379ace879ef936ff60bb..b86a0ad1d083dfe871a15a32180f26c521b0935f 100644
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@@ -39,6 +39,13 @@ char* extractDBName(const char* tableId, char* name) {
   return strncpy(name, &tableId[offset1 + 1], len);
 }
 
+int32_t tableIdPrefix(const char* name, char* prefix, int32_t len) {
+  tstrncpy(prefix, name, len);
+  strcat(prefix, TS_PATH_DELIMITER);
+
+  return strlen(prefix);
+}
+
 SSchema tGetTableNameColumnSchema() {
   SSchema s = {0};
   s.bytes = TSDB_TABLE_NAME_LEN - 1 + VARSTR_HEADER_SIZE;
@@ -198,4 +205,4 @@ SSchema tscGetTbnameColumnSchema() {
 
   strcpy(s.name, TSQL_TBNAME_L);
   return s;
-}
\ No newline at end of file
+}
diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 2149cb12c0471e747a340a09d869ff6784fc9ccf..aa77f5531d958eb7717ac3751e68f596ba73b9b9 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -2629,9 +2629,7 @@ static int32_t mnodeRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows
   SPatternCompareInfo info = PATTERN_COMPARE_INFO_INITIALIZER;
 
   char prefix[64] = {0};
-  tstrncpy(prefix, pDb->name, 64);
-  strcat(prefix, TS_PATH_DELIMITER);
-  int32_t prefixLen = strlen(prefix);
+  int32_t prefixLen = tableIdPrefix(pDb->name, prefix, 64);
 
   char* pattern = NULL;
   if (pShow->payloadLen > 0) {