diff --git a/src/common/src/tname.c b/src/common/src/tname.c
index 29236ed0ff89a4bb2b803a4d924591ba7a05c291..3566f26abd944d1f170b2569e8058c08c0478807 100644
--- a/src/common/src/tname.c
+++ b/src/common/src/tname.c
@@ -29,6 +29,7 @@ void extractTableName(const char* tableId, char* name) {
   size_t s2 = strcspn(&tableId[s1 + 1], &TS_PATH_DELIMITER[0]);
   
   strncpy(name, &tableId[s1 + s2 + 2], TSDB_TABLE_NAME_LEN);
+  name[TSDB_TABLE_NAME_LEN] = 0;
 }
 
 char* extractDBName(const char* tableId, char* name) {
diff --git a/src/mnode/src/mgmtTable.c b/src/mnode/src/mgmtTable.c
index f0c55449a3608de0140d617658890991592330fe..87243d25c00fd883c0a4e1fefe63867aeea72e53 100644
--- a/src/mnode/src/mgmtTable.c
+++ b/src/mnode/src/mgmtTable.c
@@ -1139,7 +1139,7 @@ int32_t mgmtRetrieveShowSuperTables(SShowObj *pShow, char *data, int32_t rows, v
   prefixLen = strlen(prefix);
 
   SPatternCompareInfo info = PATTERN_COMPARE_INFO_INITIALIZER;
-  char stableName[TSDB_TABLE_NAME_LEN] = {0};
+  char stableName[TSDB_TABLE_NAME_LEN + 1] = {0};
 
   while (numOfRows < rows) {    
     pShow->pIter = mgmtGetNextSuperTable(pShow->pIter, &pTable);
@@ -2148,7 +2148,7 @@ static int32_t mgmtRetrieveShowTables(SShowObj *pShow, char *data, int32_t rows,
       continue;
     }
 
-    char tableName[TSDB_TABLE_NAME_LEN] = {0};
+    char tableName[TSDB_TABLE_NAME_LEN + 1] = {0};
     
     // pattern compare for table name
     mgmtExtractTableName(pTable->info.tableId, tableName);
diff --git a/tests/pytest/table/boundary.py b/tests/pytest/table/boundary.py
index b68671c61a8c3e8f36372a3692732cbaec0635a7..29fdd5c475b39a375071ab1d24b42ef098e901f3 100644
--- a/tests/pytest/table/boundary.py
+++ b/tests/pytest/table/boundary.py
@@ -10,7 +10,7 @@ from util.sql import *
 
 
 class TDTestCase:
-    def init(self, conn):
+    def init(self, conn, logSql):
         tdLog.debug("start to execute %s" % __file__)
         tdSql.init(conn.cursor(), logSql)
 
@@ -95,18 +95,43 @@ class TDTestCase:
         maxTableNameLen = self.getLimitFromSourceCode('TSDB_TABLE_NAME_LEN')
         tdLog.notice("table name max length is %d" % maxTableNameLen)
 
-        name = self.generateString(maxTableNameLen - 1)
-        tdLog.info("table name is '%s'" % name)
+        # create a super table with name exceed max length
+        sname = self.generateString(maxTableNameLen + 1)
+        tdLog.info("create a super table with length %d" % len(sname))
+        tdSql.error("create table %s (ts timestamp, value int) tags(id int)" % sname)
 
-        tdSql.execute("create table %s (ts timestamp, value int)" % name)
-        tdSql.execute("insert into %s values(now, 0)" % name)
+        # create a super table with name of max length
+        sname = self.generateString(maxTableNameLen)
+        tdLog.info("create a super table with length %d" % len(sname))
+        tdSql.execute("create table %s (ts timestamp, value int) tags(id int)" % sname)
+        tdLog.info("check table count, should be one")
+        tdSql.query('show stables')
+        tdSql.checkRows(1)
+
+        # create a child table with name exceed max length
+        name = self.generateString(maxTableNameLen + 1)
+        tdLog.info("create a child table with length %d" % len(name))
+        tdSql.error("create table %s using %s tags(0)" % (name, sname))
 
+        # create a child table with name of max length
+        name = self.generateString(maxTableNameLen)
+        tdLog.info("create a child table with length %d" % len(name))
+        tdSql.execute("create table %s using %s tags(0)" % (name, sname))
         tdSql.query('show tables')
         tdSql.checkRows(1)
 
-        tdSql.query('select * from %s' % name)
+        # insert one row
+        tdLog.info("insert one row of data")
+        tdSql.execute("insert into %s values(now, 0)" % name)
+        tdSql.query("select * from " + name)
+        tdSql.checkRows(1)
+        tdSql.query("select * from " + sname)
         tdSql.checkRows(1)
 
+        name = name[:len(name) - 1]
+        tdSql.error("select * from " + name)
+        tdSql.checkRows(0)
+
     def checkRowBoundaries(self):
         tdLog.debug("checking row boundaries")
         tdSql.prepare()
diff --git a/tests/pytest/util/sql.py b/tests/pytest/util/sql.py
index 245e4b0945181762d0dc7994d3bcf0d2d46b1fd4..ec7ac117c07ee6c34ea91ffbb148729ab4c55119 100644
--- a/tests/pytest/util/sql.py
+++ b/tests/pytest/util/sql.py
@@ -58,6 +58,9 @@ class TDSql:
                 "%s failed: sql:%s, expect error not occured" %
                 (callerFilename, sql))
         else:
+            self.queryRows = 0
+            self.queryCols = 0
+            self.queryResult = None
             tdLog.info("sql:%s, expect error occured" % (sql))
 
     def query(self, sql):