diff --git a/src/mnode/src/mnodeDb.c b/src/mnode/src/mnodeDb.c
index 2134aaea02e195d89ddf77999d1b38fb508076ce..d5f52836f29c446238574883e3e7e65b59046dca 100644
--- a/src/mnode/src/mnodeDb.c
+++ b/src/mnode/src/mnodeDb.c
@@ -250,7 +250,7 @@ static int32_t mnodeCheckDbCfg(SDbCfg *pCfg) {
   }
 
   if (pCfg->daysToKeep2 < TSDB_MIN_KEEP || pCfg->daysToKeep2 > pCfg->daysToKeep) {
-    mError("invalid db option daysToKeep2:%d valid range: [%d, %d]", pCfg->daysToKeep, TSDB_MIN_KEEP, pCfg->daysToKeep);
+    mError("invalid db option daysToKeep2:%d valid range: [%d, %d]", pCfg->daysToKeep2, TSDB_MIN_KEEP, pCfg->daysToKeep);
     return TSDB_CODE_MND_INVALID_DB_OPTION_KEEP;
   }
 
diff --git a/tests/pytest/hivemq-extension-test.py b/tests/pytest/hivemq-extension-test.py
new file mode 100644
index 0000000000000000000000000000000000000000..3d0b1ef83fe5841826ad0ab80384b5320662e104
--- /dev/null
+++ b/tests/pytest/hivemq-extension-test.py
@@ -0,0 +1,249 @@
+#!/usr/bin/python3
+###################################################################
+#           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
+#
+###################################################################
+# install pip
+# pip install src/connector/python/linux/python2/
+import sys
+import os
+import os.path
+import time
+import glob
+import getopt
+import subprocess
+from shutil import which
+from multipledispatch import dispatch
+
+
+@dispatch(str, str)
+def v_print(msg: str, arg: str):
+    if verbose:
+        print(msg % arg)
+
+
+@dispatch(str, int)
+def v_print(msg: str, arg: int):
+    if verbose:
+        print(msg % int(arg))
+
+
+@dispatch(str, int, int)
+def v_print(msg: str, arg1: int, arg2: int):
+    if verbose:
+        print(msg % (int(arg1), int(arg2)))
+
+
+@dispatch(str, int, int, int)
+def v_print(msg: str, arg1: int, arg2: int, arg3: int):
+    if verbose:
+        print(msg % (int(arg1), int(arg2), int(arg3)))
+
+
+@dispatch(str, int, int, int, int)
+def v_print(msg: str, arg1: int, arg2: int, arg3: int, arg4: int):
+    if verbose:
+        print(msg % (int(arg1), int(arg2), int(arg3), int(arg4)))
+
+
+def isHiveMQInstalled():
+    v_print("%s", "Check if HiveMQ installed")
+    defaultHiveMQPath = "/opt/hivemq*"
+    hiveMQDir = glob.glob(defaultHiveMQPath)
+    if (len(hiveMQDir) == 0):
+        v_print("%s", "ERROR: HiveMQ NOT found")
+        return False
+    else:
+        v_print("HiveMQ installed at %s", hiveMQDir[0])
+    return True
+
+
+def isMosquittoInstalled():
+    v_print("%s", "Check if mosquitto installed")
+    if not which('mosquitto_pub'):
+        v_print("%s", "ERROR: mosquitto is NOT installed")
+        return False
+    else:
+        return True
+
+
+def installExtension():
+    currentDir = os.getcwd()
+    extDir = 'src/connector/hivemq-tdengine-extension'
+    os.chdir('../..')
+    os.system('git submodule update --init -- %s' % extDir)
+    os.chdir(extDir)
+    v_print("%s", "build extension..")
+    os.system('mvn clean package')
+
+    tdExtensionZip = 'target/hivemq-tdengine-extension*.zip'
+    tdExtensionZipDir = glob.glob(tdExtensionZip)
+
+    defaultHiveMQPath = "/opt/hivemq*"
+    hiveMQDir = glob.glob(defaultHiveMQPath)
+    extPath = hiveMQDir[0] + '/extensions'
+
+    tdExtDir = glob.glob(extPath + '/hivemq-tdengine-extension')
+    if len(tdExtDir):
+        v_print("%s", "delete exist extension..")
+        os.system('rm -rf %s' % tdExtDir[0])
+
+    v_print("%s", "unzip extension..")
+    os.system('unzip %s -d %s' % (tdExtensionZipDir[0], extPath))
+
+    os.chdir(currentDir)
+
+
+def stopProgram(prog: str):
+    psCmd = "ps ax|grep -w %s| grep -v grep | awk '{print $1}'" % prog
+
+    processID = subprocess.check_output(
+        psCmd, shell=True).decode("utf-8")
+
+    while(processID):
+        killCmd = "kill -TERM %s > /dev/null 2>&1" % processID
+        os.system(killCmd)
+        time.sleep(1)
+        processID = subprocess.check_output(
+            psCmd, shell=True).decode("utf-8")
+    pass
+
+
+def stopHiveMQ():
+    stopProgram("hivemq.jar")
+    v_print("%s", "ERROR: HiveMQ is NOT running")
+
+
+def checkProgramRunning(prog: str):
+    psCmd = "ps ax|grep -w %s| grep -v grep | awk '{print $1}'" % prog
+
+    processID = subprocess.check_output(
+        psCmd, shell=True).decode("utf-8")
+
+    if not processID:
+        v_print("ERROR: %s is NOT running", prog)
+        return False
+    else:
+        return True
+
+
+def runHiveMQ():
+    defaultHiveMQPath = "/opt/hivemq*"
+    hiveMQDir = glob.glob(defaultHiveMQPath)
+    runPath = hiveMQDir[0] + '/bin/run.sh > /dev/null &'
+    os.system(runPath)
+    time.sleep(10)
+
+    if not checkProgramRunning("hivemq.jar"):
+        return False
+    else:
+        v_print("%s", "hivemq is running")
+        return True
+
+
+def getBuildPath():
+    selfPath = os.path.dirname(os.path.realpath(__file__))
+
+    binPath = ''
+
+    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):
+            rootRealPath = os.path.dirname(os.path.realpath(root))
+            if ("packaging" not in rootRealPath):
+                binPath = root[:len(root) - len("/build/bin")]
+                break
+    return binPath
+
+
+def runTDengine():
+    stopProgram("taosd")
+
+    buildPath = getBuildPath()
+
+    if (buildPath == ""):
+        v_print("%s", "ERROR: taosd NOT found!")
+        sys.exit(1)
+    else:
+        v_print("%s", "taosd found in %s" % buildPath)
+
+    binPath = buildPath + "/build/bin/taosd"
+
+    os.system('%s > /dev/null &' % binPath)
+    time.sleep(10)
+    if not checkProgramRunning("taosd"):
+        return False
+    else:
+        v_print("%s", "TDengine is running")
+        return True
+
+
+
+def reCreateDatabase():
+    buildPath = getBuildPath()
+    binPath = buildPath + "/build/bin/taos"
+
+    os.system('%s -s "DROP DATABASE IF EXISTS hivemq"' % binPath)
+    os.system('%s -s "CREATE DATABASE IF NOT EXISTS hivemq"' % binPath)
+
+
+def sendMqttMsg(topic: str, payload: str):
+    testStr = 'mosquitto_pub -t %s -m "%s"' % (topic, payload)
+    os.system(testStr)
+    time.sleep(3)
+
+
+def checkTDengineData(topic: str, payload: str):
+    buildPath = getBuildPath()
+    binPath = buildPath + "/build/bin/taos"
+
+    output = subprocess.check_output(
+        '%s -s "select * from hivemq.mqtt_payload"' %
+        binPath, shell=True).decode('utf-8')
+    if (topic in output) and (payload in output):
+        v_print("%s", output)
+        return True
+    else:
+        v_print("%s", "ERROR: mqtt topic or payload NOT found")
+        return False
+
+
+if __name__ == "__main__":
+    verbose = True
+    testTopic = 'test'
+    testPayload = 'hello world'
+
+    if not isHiveMQInstalled():
+        sys.exit(1)
+
+    if not isMosquittoInstalled():
+        sys.exit(1)
+
+    stopHiveMQ()
+
+    installExtension()
+
+    if not runTDengine():
+        sys.exit(1)
+
+    reCreateDatabase()
+
+    if not runHiveMQ():
+        sys.exit(1)
+
+    sendMqttMsg(testTopic, testPayload)
+
+    if not checkTDengineData(testTopic, testPayload):
+        sys.exit(1)
+
+    sys.exit(0)
diff --git a/tests/script/general/db/alter_option.sim b/tests/script/general/db/alter_option.sim
index c8aa2480c509353ede3c6ce6269afa9e6efd62b5..1c3f543ffdb149d67cfaf1527a0e88f46f626913 100644
--- a/tests/script/general/db/alter_option.sim
+++ b/tests/script/general/db/alter_option.sim
@@ -115,31 +115,31 @@ if $data7_db != 20,20,20 then
   return -1
 endi
 
-sql alter database db keep 10
+sql alter database db keep 20
 sql show databases
 print keep $data7_db
-if $data7_db != 20,20,10 then 
+if $data7_db != 20,20,20 then
   return -1
 endi
 
-sql alter database db keep 20
+sql alter database db keep 30
 sql show databases
 print keep $data7_db
-if $data7_db != 20,20,20 then 
+if $data7_db != 20,20,30 then
   return -1
 endi
 
-sql alter database db keep 30
+sql alter database db keep 40
 sql show databases
 print keep $data7_db
-if $data7_db != 20,20,30 then 
+if $data7_db != 20,20,40 then
   return -1
 endi
 
 sql alter database db keep 40
 sql alter database db keep 30
 sql alter database db keep 20
-sql alter database db keep 10
+sql_error alter database db keep 10
 sql_error alter database db keep 9
 sql_error alter database db keep 1
 sql alter database db keep 0
@@ -277,4 +277,4 @@ sql_error alter database db prec 'us'
 print ============== step status
 sql_error alter database db status 'delete'
 
-system sh/exec.sh -n dnode1 -s stop -x SIGINT
\ No newline at end of file
+system sh/exec.sh -n dnode1 -s stop -x SIGINT