diff --git a/tests/system-test/0-others/tag_index_advance.py b/tests/system-test/0-others/tag_index_advance.py
new file mode 100644
index 0000000000000000000000000000000000000000..a8d6cde85a7a67f1b1e23ef06d5b30d7908b02ea
--- /dev/null
+++ b/tests/system-test/0-others/tag_index_advance.py
@@ -0,0 +1,520 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+from ssl import ALERT_DESCRIPTION_CERTIFICATE_UNOBTAINABLE
+import taos
+import sys
+import time
+import os
+import socket
+import subprocess
+import random
+import string
+import random
+
+
+from util.log import *
+from util.sql import *
+from util.cases import *
+from util.common import *
+from util.sqlset import *
+
+from util.dnodes import *
+from util.dnodes import TDDnodes
+from util.dnodes import TDDnode
+
+#
+# --------------    util   --------------------------
+#
+def pathSize(path):
+    
+    total_size = 0
+    for dirpath, dirnames, filenames in os.walk(path):
+        for i in filenames:
+            #use join to concatenate all the components of path
+            f = os.path.join(dirpath, i)
+            #use getsize to generate size in bytes and add it to the total size
+            total_size += os.path.getsize(f)
+            #print(dirpath)
+
+    print(" %s  %.02f MB"%(path, total_size/1024/1024))
+    return total_size
+    
+    '''
+    total = 0
+    with os.scandir(path) as it:
+        for entry in it:
+            if entry.is_file():
+                total += entry.stat().st_size
+            elif entry.is_dir():
+                total += pathSize(entry.path)
+    
+    print(" %s  %.02f MB"%(path, total/1024/1024))
+    return total
+    '''
+
+#
+# ---------------    cluster  ------------------------
+#
+
+class MyDnodes(TDDnodes):
+    def __init__(self ,dnodes_lists):
+        super(MyDnodes,self).__init__()
+        self.dnodes = dnodes_lists  # dnode must be TDDnode instance
+        self.simDeployed = False
+
+class TagCluster:
+    noConn = True
+    def init(self, conn, logSql, replicaVar=1):
+        tdLog.debug(f"start to excute {__file__}")
+        self.TDDnodes = None
+        self.depoly_cluster(5)
+        self.master_dnode = self.TDDnodes.dnodes[0]
+        self.host=self.master_dnode.cfgDict["fqdn"]
+        conn1 = taos.connect(self.master_dnode.cfgDict["fqdn"] , config=self.master_dnode.cfgDir)
+        tdSql.init(conn1.cursor())
+
+
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files or "taosd.exe" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root) - len("/build/bin")]
+                    break
+        return buildPath
+
+
+    def depoly_cluster(self ,dnodes_nums):
+
+        testCluster = False
+        valgrind = 0
+        hostname = socket.gethostname()
+        dnodes = []
+        start_port = 6030
+        for num in range(1, dnodes_nums+1):
+            dnode = TDDnode(num)
+            dnode.addExtraCfg("firstEp", f"{hostname}:{start_port}")
+            dnode.addExtraCfg("fqdn", f"{hostname}")
+            dnode.addExtraCfg("serverPort", f"{start_port + (num-1)*100}")
+            dnode.addExtraCfg("monitorFqdn", hostname)
+            dnode.addExtraCfg("monitorPort", 7043)
+            dnodes.append(dnode)
+
+        self.TDDnodes = MyDnodes(dnodes)
+        self.TDDnodes.init("")
+        self.TDDnodes.setTestCluster(testCluster)
+        self.TDDnodes.setValgrind(valgrind)
+
+        self.TDDnodes.setAsan(tdDnodes.getAsan())
+        self.TDDnodes.stopAll()
+        for dnode in self.TDDnodes.dnodes:
+            self.TDDnodes.deploy(dnode.index,{})
+
+        for dnode in self.TDDnodes.dnodes:
+            self.TDDnodes.starttaosd(dnode.index)
+
+        # create cluster
+        dnode_first_host = ""
+        sql = ""
+        for dnode in self.TDDnodes.dnodes[1:]:
+            # print(dnode.cfgDict)
+            dnode_id = dnode.cfgDict["fqdn"] +  ":" +dnode.cfgDict["serverPort"]
+            if dnode_first_host == "":
+                dnode_first_host = dnode.cfgDict["firstEp"].split(":")[0]
+                dnode_first_port = dnode.cfgDict["firstEp"].split(":")[-1]
+            sql += f"create dnode '{dnode_id}'; "
+
+        cmd = f"{self.getBuildPath()}/build/bin/taos -h {dnode_first_host} -P {dnode_first_port} -s "
+        cmd += f'"{sql}"'
+        print(cmd)
+        os.system(cmd) 
+
+        time.sleep(2)
+        tdLog.info(" create cluster done! ")
+
+
+    def getConnection(self, dnode):
+        host = dnode.cfgDict["fqdn"]
+        port = dnode.cfgDict["serverPort"]
+        config_dir = dnode.cfgDir
+        return taos.connect(host=host, port=int(port), config=config_dir)
+        
+    def run(self):
+        tdLog.info(" create cluster ok.")
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success(f"{__file__} successfully executed")
+
+
+class PerfDB:
+    def __init__(self):
+        self.sqls = []
+        self.spends= []
+    
+    # execute
+    def execute(self, sql):
+        print(f"  perfdb execute {sql}")   
+        stime = time.time()
+        ret = tdSql.execute(sql, 1)
+        spend = time.time() - stime
+        
+        self.sqls.append(sql)
+        self.spends.append(spend)
+        return ret
+
+    # query
+    def query(self, sql):
+        print(f"  perfdb query {sql}")   
+        start = time.time()
+        ret = tdSql.query(sql, None, 1)
+        spend = time.time() - start
+        self.sqls.append(sql)
+        self.spends.append(spend)
+        return ret
+
+
+#
+#  -----------------  TDTestCase    ------------------
+#
+class TDTestCase:
+    def init(self, conn, logSql, replicaVar=1):
+        tdLog.debug("start to execute %s" % __file__)
+        self.dbs = [PerfDB(), PerfDB()]
+        self.cur = 0
+        self.tagCluster = TagCluster()
+        self.tagCluster.init(conn, logSql, replicaVar)
+        self.lenBinary = 64
+        self.lenNchar  = 32
+        
+        # column 
+        self.column_dict = {
+            'ts': 'timestamp',
+            'col1': 'tinyint',
+            'col2': 'smallint',
+            'col3': 'int',
+            'col4': 'bigint',
+            'col5': 'tinyint unsigned',
+            'col6': 'smallint unsigned',
+            'col7': 'int unsigned',
+            'col8': 'bigint unsigned',
+            'col9': 'float',
+            'col10': 'double',
+            'col11': 'bool',
+            'col12': f'varchar({self.lenBinary})',
+            'col13': f'nchar({self.lenNchar})'
+        }
+        # tag
+        self.tag_dict = {
+            't1': 'tinyint',
+            't2': 'smallint',
+            't3': 'int',
+            't4': 'bigint',
+            't5': 'tinyint unsigned',
+            't6': 'smallint unsigned',
+            't7': 'int unsigned',
+            't8': 'bigint unsigned',
+            't9': 'float',
+            't10': 'double',
+            't11': 'bool',
+            't12': f'varchar({self.lenBinary})',
+            't13': f'nchar({self.lenNchar})',
+            't14': 'timestamp'
+        }
+
+    # generate specail wide random string
+    def random_string(self, count):
+        letters = string.ascii_letters
+        return ''.join(random.choice(letters) for i in range(count))
+
+    # execute
+    def execute(self, sql):
+        obj = self.dbs[self.cur]
+        return obj.execute(sql)
+
+    # query
+    def query(self, sql):
+        return self.dbs[self.cur].query(sql)   
+    
+    def set_stb_sql(self,stbname,column_dict,tag_dict):
+        column_sql = ''
+        tag_sql = ''
+        for k,v in column_dict.items():
+            column_sql += f"{k} {v}, "
+        for k,v in tag_dict.items():
+            tag_sql += f"{k} {v}, "
+        create_stb_sql = f'create stable {stbname} ({column_sql[:-2]}) tags ({tag_sql[:-2]})'
+        return create_stb_sql
+
+    # create datbase
+    def create_database(self, dbname, vgroups, replica):
+        sql = f'create database {dbname} vgroups {vgroups} replica {replica}'
+        tdSql.execute(sql)
+        #tdSql.execute(sql)
+        tdSql.execute(f'use {dbname}')
+    
+    # create stable and child tables
+    def create_table(self, stbname, tbname, count):
+        # create stable
+        create_table_sql = self.set_stb_sql(stbname, self.column_dict, self.tag_dict)
+        tdSql.execute(create_table_sql)
+
+        # create child table
+        tdLog.info(f" start create {count} child tables.")
+        for i in range(count):
+            ti = i % 128
+            binTxt = self.random_string(self.lenBinary)
+            tags = f'{ti},{ti},{i},{i},{ti},{ti},{i},{i},{i}.000{i},{i}.000{i},true,"{binTxt}","nch{i}",now'
+            sql  = f'create table {tbname}{i} using {stbname} tags({tags})'
+            tdSql.execute(sql)
+            if i > 0 and i % 1000 == 0:
+                tdLog.info(f"  child table count = {i}")
+
+        tdLog.info(f" end create {count} child tables.")
+    
+    
+    # create stable and child tables
+    def create_tagidx(self, stbname):
+        cnt = -1
+        for key in self.tag_dict.keys():
+            # first tag have default index, so skip
+            if cnt == -1:
+                cnt = 0
+                continue; 
+            sql = f'create index idx_{key} on {stbname} ({key})'
+            tdLog.info(f"  sql={sql}")
+            tdSql.execute(sql)
+            cnt += 1
+        tdLog.info(f' create {cnt} tag indexs ok.')
+
+     # insert to child table d1 data
+    def insert_data(self, tbname):
+        # d1 insert 3 rows
+        for i in range(3):
+            sql = f'insert into {tbname}1(ts,col1) values(now+{i}s,{i});' 
+            tdSql.execute(sql)
+        # d20 insert 4
+        for i in range(4):
+            sql = f'insert into {tbname}20(ts,col1) values(now+{i}s,{i});' 
+            tdSql.execute(sql)
+
+    # check show indexs
+    def show_tagidx(self, dbname, stbname):
+        sql = f'select index_name,column_name from information_schema.ins_indexes where db_name="{dbname}"'
+        tdSql.query(sql)
+        rows = len(self.tag_dict.keys())-1
+        tdSql.checkRows(rows)
+
+        for i in range(rows):
+            col_name = tdSql.getData(i, 1)
+            idx_name = f'idx_{col_name}'
+            tdSql.checkData(i, 0, idx_name)
+
+        tdLog.info(f' show {rows} tag indexs ok.')
+
+    # query with tag idx
+    def query_tagidx(self, stbname):
+        sql = f'select * from meters where t2=1'
+        self.query(sql)
+        tdSql.checkRows(3)
+
+        sql = f'select * from meters where t2<10'
+        self.query(sql)
+        tdSql.checkRows(3)
+
+        sql = f'select * from meters where t2>10'
+        self.query(sql)
+        tdSql.checkRows(4)
+
+        sql = f'select * from meters where t3<30'
+        self.query(sql)
+        tdSql.checkRows(7)
+
+        sql = f'select * from meters where t12="11"'
+        tdSql.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where (t4 < 10 or t5 = 20) and t6= 30'
+        self.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where (t7 < 20 and t8 = 20) or t4 = 20'
+        self.query(sql)
+        tdSql.checkRows(4)
+
+        sql = f'select * from meters where t12 like "%ab%" '
+        self.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where t13 = "d20" '
+        self.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where t13 = "nch20" '
+        self.query(sql)
+        tdSql.checkRows(4)
+
+        sql = f'select * from meters where tbname = "d20" '
+        self.query(sql)
+        tdSql.checkRows(4)
+
+
+    # drop child table
+    def drop_tables(self, tbname, count):
+        # table d1 and d20 have verify data , so can not drop
+        start = random.randint(21, count/2)
+        end   = random.randint(count/2 + 1, count - 1)
+        for i in range(start, end):
+            sql = f'drop table {tbname}{i}'
+            tdSql.execute(sql)
+        cnt = end - start + 1    
+        tdLog.info(f' drop table from {start} to {end} count={cnt}')     
+
+    # drop tag index
+    def drop_tagidx(self, dbname, stbname):
+        # drop index
+        cnt = -1
+        for key in self.tag_dict.keys():
+            # first tag have default index, so skip
+            if cnt == -1:
+                cnt = 0
+                continue; 
+            sql = f'drop index idx_{key}'
+            tdSql.execute(sql)
+            cnt += 1
+        
+        # check idx result is 0
+        sql = f'select index_name,column_name from information_schema.ins_indexes where db_name="{dbname}"'
+        tdSql.query(sql)
+        tdSql.checkRows(0)
+        tdLog.info(f' drop {cnt} tag indexs ok.')
+
+    # show performance
+    def show_performance(self, count) :
+        db = self.dbs[0] 
+        db1 = self.dbs[1]
+        cnt = len(db.sqls)
+        cnt1 = len(db1.sqls)
+        if  cnt != len(db1.sqls):
+            tdLog.info(f"  datebase sql count not equal. cnt={cnt}  cnt1={cnt1}\n")
+            return False
+
+        tdLog.info(f" database sql cnt ={cnt}")
+        print(f"  ----------------- performance (child tables = {count})--------------------")
+        print("   No  time(index) time(no-index) diff(col3-col2) rate(col2/col3)  sql")
+        for i in range(cnt):
+            key = db.sqls[i]
+            value = db.spends[i]
+            key1 = db1.sqls[i]
+            value1 = db1.spends[i]
+            diff = value1 - value
+            rate = value/value1*100
+            print("   %d   %.3fs      %.3fs          %.3fs         %d%%          %s"%(i+1, value, value1, diff, rate, key))
+        print("  --------------------- end ------------------------")
+        return True 
+    
+    def show_diskspace(self):
+        #calc
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+        projPath = ""
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        # total
+        vnode2_size = pathSize(projPath + "sim/dnode2/data/vnode/vnode2/")
+        vnode3_size = pathSize(projPath + "sim/dnode3/data/vnode/vnode3/")
+        vnode4_size = pathSize(projPath + "sim/dnode4/data/vnode/vnode4/")
+        vnode5_size = pathSize(projPath + "sim/dnode5/data/vnode/vnode5/")
+
+        # show
+        print("  ----------------- disk space --------------------")
+        idx_size = vnode2_size + vnode3_size
+        noidx_size = vnode4_size + vnode5_size
+
+        print("  index    = %.02f M"%(idx_size/1024/1024))
+        print("  no-index = %.02f M"%(noidx_size/1024/1024))
+        print("  index/no-index = %.2f multiple"%(idx_size/noidx_size))
+
+        print("  -------------------- end ------------------------")
+
+
+
+
+    # main
+    def testdb(self, dbname, stable, tbname, count, createidx):
+        # cur
+        if createidx:
+            self.cur = 0
+        else :
+            self.cur = 1
+
+        # do 
+        self.create_database(dbname, 2, 1)
+        self.create_table(stable, tbname, count)
+        if(createidx):
+           self.create_tagidx(stable)
+        self.insert_data(tbname)
+        if(createidx):
+           self.show_tagidx(dbname,stable)
+        self.query_tagidx(stable)
+        #self.drop_tables(tbname, count)
+        #if(createidx):
+        #   self.drop_tagidx(dbname, stable)
+        # query after delete , expect no crash
+        #self.query_tagidx(stable)
+        tdSql.execute(f'flush database {dbname}')
+
+    # run
+    def run(self):
+        self.tagCluster.run()
+        
+        # var
+        dbname = "tagindex"
+        dbname1 = dbname + "1"
+        stable = "meters"
+        tbname = "d"
+        count = 10000
+
+        # test db
+        tdLog.info(f" -------------  {dbname} ----------")
+        self.testdb(dbname, stable, tbname, count, True)
+        tdLog.info(f" -------------  {dbname1} ----------")
+        self.testdb(dbname1, stable, tbname, count, False)
+
+        # show test result
+        self.show_performance(count)
+
+        self.tagCluster.TDDnodes.stopAll()
+        sec = 10
+        print(f" sleep {sec}s wait taosd stopping ...")
+        time.sleep(sec)
+
+        self.show_diskspace()
+
+
+    def stop(self):
+        self.tagCluster.stop()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())
\ No newline at end of file
diff --git a/tests/system-test/0-others/tag_index_basic.py b/tests/system-test/0-others/tag_index_basic.py
index 195d8910e76984e5d6f232fbc272df07ffb4282e..96c3dca016df5c9f7bc995951bff0d01cbadd23f 100644
--- a/tests/system-test/0-others/tag_index_basic.py
+++ b/tests/system-test/0-others/tag_index_basic.py
@@ -107,11 +107,11 @@ class TDTestCase:
     def insert_data(self, tbname):
         # d1 insert 3 rows
         for i in range(3):
-            sql = f'insert into {tbname}1(ts,col1) values(now,{i});' 
+            sql = f'insert into {tbname}1(ts,col1) values(now+{i}s,{i});' 
             tdSql.execute(sql)
         # d20 insert 4
         for i in range(4):
-            sql = f'insert into {tbname}20(ts,col1) values(now,{i});' 
+            sql = f'insert into {tbname}20(ts,col1) values(now+{i}s,{i});' 
             tdSql.execute(sql)
 
     # check show indexs
@@ -150,6 +150,22 @@ class TDTestCase:
         tdSql.query(sql)
         tdSql.checkRows(0)
 
+        sql = f'select t12 ,t13,tbname from meters where t13="nch20"'
+        tdSql.query(sql)
+        tdSql.checkRows(4)
+
+        sql = f'select * from meters where t12 like "%ab%" '
+        tdSql.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where t13 = "d20" '
+        tdSql.query(sql)
+        tdSql.checkRows(0)
+
+        sql = f'select * from meters where tbname = "d20" '
+        tdSql.query(sql)
+        tdSql.checkRows(4)
+
         sql = f'select * from meters where (t4 < 10 or t5 = 20) and t6= 30'
         tdSql.query(sql)
         tdSql.checkRows(0)
@@ -188,6 +204,22 @@ class TDTestCase:
         tdSql.checkRows(0)
         tdLog.info(f' drop {cnt} tag indexs ok.')
 
+    # create long name idx 
+    def longname_idx(self, stbname):
+        long_name = "aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffffgggggggggghhhhhhhhhhiiiiiiiiiijjjjjjjjjjkkkkkkkkkkllllllllllmmmmmmmmmm"
+        key = "t3"
+        sql = f'create index {long_name} on {stbname} ({key})'
+        tdSql.error(sql)
+
+        long_name = "aaaaaaaaaabbbbbbbbbbccccccccccddddddddddeeeeeeeeeeffffffffff"
+        key = "t3"
+        sql = f'create index {long_name} on {stbname} ({key})'
+        tdLog.info(f"{sql}")
+        tdSql.execute(sql)
+        sql = f'drop index {long_name}'
+        tdLog.info(f"{sql}")
+        tdSql.execute(sql)
+
     # run
     def run(self):
         # var
@@ -204,6 +236,7 @@ class TDTestCase:
         self.drop_tagidx(stable)
         # query after delete , expect no crash
         self.query_tagidx(stable)
+        self.longname_idx(stable)
 
 
     def stop(self):
diff --git a/tools/shell/src/shellAuto.c b/tools/shell/src/shellAuto.c
index 1d872e3f0d27b88eefd16c29d02c831eda6d284d..a8986351b7325802ba6a121db56a1cbc5dfe1295 100644
--- a/tools/shell/src/shellAuto.c
+++ b/tools/shell/src/shellAuto.c
@@ -86,8 +86,8 @@ SWords shellCommands[] = {
      "<anyword> <db_options> <anyword> <db_options> <anyword> <db_options> <anyword> <db_options> <anyword> "
      "<db_options> <anyword> <db_options> <anyword> ;",
      0, 0, NULL},
-    {"create dnode ", 0, 0, NULL},
-    {"create index ", 0, 0, NULL},
+    {"create dnode <anyword>", 0, 0, NULL},
+    {"create index <anyword> on <stb_name> ()", 0, 0, NULL},
     {"create mnode on dnode <dnode_id> ;", 0, 0, NULL},
     {"create qnode on dnode <dnode_id> ;", 0, 0, NULL},
     {"create stream <anyword> into <anyword> as select", 0, 0, NULL},  // 26 append sub sql
@@ -98,6 +98,7 @@ SWords shellCommands[] = {
     {"describe <all_table>", 0, 0, NULL},
     {"delete from <all_table> where ", 0, 0, NULL},
     {"drop database <db_name>", 0, 0, NULL},
+    {"drop index <anyword>", 0, 0, NULL},
     {"drop table <all_table>", 0, 0, NULL},
     {"drop dnode <dnode_id>", 0, 0, NULL},
     {"drop mnode on dnode <dnode_id> ;", 0, 0, NULL},
@@ -384,7 +385,7 @@ void showHelp() {
     create table <tb_name> using <stb_name> tags ...\n\
     create database <db_name> <db_options>  ...\n\
     create dnode \"fqdn:port\" ...\n\
-    create index ...\n\
+    create index <index_name> on <stb_name> (tag_column_name);\n\
     create mnode on dnode <dnode_id> ;\n\
     create qnode on dnode <dnode_id> ;\n\
     create stream <stream_name> into <stb_name> as select ...\n\
@@ -404,6 +405,7 @@ void showHelp() {
     drop consumer group ... \n\
     drop topic <topic_name> ;\n\
     drop stream <stream_name> ;\n\
+    drop index <index_name>;\n\
   ----- E ----- \n\
     explain select clause ...\n\
   ----- F ----- \n\
@@ -534,7 +536,7 @@ SWord* addWord(const char* p, int32_t len, bool pattern) {
   word->len = len;
 
   // check format
-  if (pattern) {
+  if (pattern && len > 0) {
     word->type = wordType(p, len);
   } else {
     word->type = WT_TEXT;
@@ -1724,6 +1726,9 @@ bool matchEnd(TAOS* con, SShellCmd* cmd) {
   if (strlen(last) == 0) {
     goto _return;
   }
+  if (strcmp(last, " ") == 0) {
+    goto _return;
+  }
 
   // match database
   if (elast == NULL) {