diff --git a/tests/script/unique/big/balance.sim b/tests/script/unique/big/balance.sim
index a9092ac790550f523c934b4214bd89605e420414..91a7c538d27a30433aeea1fd1214e3c2d79283ec 100644
--- a/tests/script/unique/big/balance.sim
+++ b/tests/script/unique/big/balance.sim
@@ -321,6 +321,63 @@ if $data00 != $totalNum then
   goto show5
 endi
 
+
+print ========== step6
+sleep 3000
+sql alter database db replica 1
+
+$x = 0
+show6: 
+	$x = $x + 1
+	sleep 3000
+	if $x == 10 then 
+		return -1
+	endi
+	
+sql show dnodes
+print dnode1 freeVnodes $data2_1
+print dnode4 freeVnodes $data2_4
+if $data2_1 != 2 then
+	goto show6
+endi
+if $data2_4 != 2 then
+	goto show6
+endi
+
+sql reset query cache
+sleep 1000
+
+sql select count(*) from t10
+print select count(*) from t10 $data00 expect $rowNum 
+if $data00 != $rowNum then
+  goto show5
+endi
+
+sql select count(*) from t1010
+print select count(*) from t1010 $data00 expect $rowNum 
+if $data00 != $rowNum then
+  goto show5
+endi
+
+sql select count(*) from t2010
+print select count(*) from t2010 $data00 expect $rowNum 
+if $data00 != $rowNum then
+  goto show5
+endi
+
+sql select count(*) from t3010
+print select count(*) from t3010 $data00 expect $rowNum 
+if $data00 != $rowNum then
+  goto show5
+endi
+
+sql select count(*) from mt
+print select count(*) from mt $data00 expect $rowNum 
+if $data00 != $totalNum then
+  goto show5
+endi
+
+
 system sh/exec.sh -n dnode1 -s stop  -x SIGINT
 system sh/exec.sh -n dnode2 -s stop  -x SIGINT
 system sh/exec.sh -n dnode3 -s stop  -x SIGINT