diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index 12ea4ad78d18a5f2b09daabb71093c153d30aca7..719d80aa775bf3b5abe3065ef7eca799d452e315 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -318,7 +318,7 @@ SDataCols *tdNewDataCols(int maxRowSize, int maxCols, int maxRows) {
   pCols->maxPoints = maxRows;
   pCols->bufSize = maxRowSize * maxRows;
 
-  pCols->buf = malloc(pCols->bufSize);
+  pCols->buf = calloc(1, pCols->bufSize);
   if (pCols->buf == NULL) {
     free(pCols);
     return NULL;
diff --git a/tests/script/sh/deploy.sh b/tests/script/sh/deploy.sh
index 445baa9e45326e895d75489262217f9d3f938606..b9a9e4f02460717e04d4ba4f6347f9bab666207b 100755
--- a/tests/script/sh/deploy.sh
+++ b/tests/script/sh/deploy.sh
@@ -136,6 +136,8 @@ echo "defaultPass         taosdata"       >> $TAOS_CFG
 echo "numOfLogLines       20000000"       >> $TAOS_CFG
 echo "mnodeEqualVnodeNum  0"              >> $TAOS_CFG
 echo "clog                2"              >> $TAOS_CFG
+#echo "cache              1"              >> $TAOS_CFG
+#echo "block              2"              >> $TAOS_CFG
 echo "statusInterval      1"              >> $TAOS_CFG
 echo "numOfTotalVnodes    4"              >> $TAOS_CFG
 echo "maxVgroupsPerDb     4"              >> $TAOS_CFG
diff --git a/tests/script/sh/exec.sh b/tests/script/sh/exec.sh
index 6928039be11642b82e9a50d2f32a38d442abfbce..2f294075a1695298cb52b53bc52e11d9dce9fe07 100755
--- a/tests/script/sh/exec.sh
+++ b/tests/script/sh/exec.sh
@@ -88,7 +88,9 @@ if [ "$EXEC_OPTON" = "start" ]; then
   echo "ExcuteCmd:" $EXE_DIR/taosd -c $CFG_DIR
   
   if [ "$SHELL_OPTION" = "true" ]; then 
-    nohup valgrind --log-file=${LOG_DIR}/valgrind.log --tool=memcheck --leak-check=full --show-reachable=no  --track-origins=yes --show-leak-kinds=all  -v  --workaround-gcc296-bugs=yes   $EXE_DIR/taosd -c $CFG_DIR > /dev/null 2>&1 &   
+    TT=`date +%s`
+    mkdir ${LOG_DIR}/${TT}
+    nohup valgrind --log-file=${LOG_DIR}/${TT}/valgrind.log --tool=memcheck --leak-check=full --show-reachable=no  --track-origins=yes --show-leak-kinds=all  -v  --workaround-gcc296-bugs=yes   $EXE_DIR/taosd -c $CFG_DIR > /dev/null 2>&1 &   
   else
     nohup $EXE_DIR/taosd -c $CFG_DIR > /dev/null 2>&1 & 
   fi
diff --git a/tests/script/unique/vnode/replica2_a_large.sim b/tests/script/unique/vnode/replica2_a_large.sim
new file mode 100644
index 0000000000000000000000000000000000000000..801570dd9c18daa5611d621660e88905fa73c2b3
--- /dev/null
+++ b/tests/script/unique/vnode/replica2_a_large.sim
@@ -0,0 +1,103 @@
+system sh/stop_dnodes.sh
+
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/deploy.sh -n dnode3 -i 3
+system sh/deploy.sh -n dnode4 -i 4
+system sh/cfg.sh -n dnode1 -c wallevel -v 2
+system sh/cfg.sh -n dnode2 -c wallevel -v 2
+system sh/cfg.sh -n dnode3 -c wallevel -v 2
+system sh/cfg.sh -n dnode4 -c wallevel -v 2
+system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode2 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode3 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode4 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode1 -c mnodeEqualVnodeNum -v 4
+system sh/cfg.sh -n dnode2 -c mnodeEqualVnodeNum -v 4
+system sh/cfg.sh -n dnode3 -c mnodeEqualVnodeNum -v 4
+system sh/cfg.sh -n dnode4 -c mnodeEqualVnodeNum -v 4
+system sh/cfg.sh -n dnode1 -c debugFlag -v 131
+system sh/cfg.sh -n dnode2 -c debugFlag -v 131
+system sh/cfg.sh -n dnode3 -c debugFlag -v 131
+system sh/cfg.sh -n dnode4 -c debugFlag -v 131
+system sh/cfg.sh -n dnode1 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode2 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode3 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode4 -c arbitrator -v $arbitrator
+
+print ============== step0: start tarbitrator
+system sh/exec_tarbitrator.sh -s start
+
+system sh/exec.sh -n dnode1 -s start
+sleep 3000
+sql connect
+
+sql create dnode $hostname2
+sql create dnode $hostname3
+system sh/exec.sh -n dnode2 -s start -t
+system sh/exec.sh -n dnode3 -s start -t
+sleep 3000
+
+print ========= step1
+sql create database db replica 2 
+#sql create table db.tb1 (ts timestamp, i int)
+#sql create table db.tb2 (ts timestamp, i int)
+#sql create table db.tb3 (ts timestamp, i int)
+#sql create table db.tb4 (ts timestamp, i int)
+#sql insert into db.tb1 values(now, 1)
+#sql select count(*) from db.tb1
+
+sql create database db replica 2 
+sql create table db.tb (ts timestamp, i int)
+sql insert into db.tb values(now, 1)
+sql select count(*) from db.tb
+$lastRows = $rows
+
+print ======== step2
+#run_back unique/vnode/back_insert_many.sim
+run_back unique/vnode/back_insert.sim
+sleep 3000
+
+print ======== step3
+
+$x = 0
+loop:
+
+print ======== step4
+system sh/exec.sh -n dnode2 -s stop -x SIGINT
+sleep 10000
+system sh/exec.sh -n dnode2 -s start -t
+sleep 10000
+
+print ======== step5
+system sh/exec.sh -n dnode3 -s stop -x SIGINT
+sleep 10000
+system sh/exec.sh -n dnode3 -s start -t
+sleep 10000
+
+print ======== step6
+#sql select count(*) from db.tb1
+#print select count(*) from db.tb1 ==> $data00 $lastRows 
+sql select count(*) from db.tb
+print select count(*) from db.tb ==> $data00 $lastRows 
+if $data00 <= $lastRows then
+  return -1
+endi
+
+print ======== step7
+$lastRows = $data00
+print ======== loop Times $x
+
+if $x < 10 then
+  $x = $x + 1
+  goto loop
+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
+system sh/exec.sh -n dnode4 -s stop  -x SIGINT
+system sh/exec.sh -n dnode5 -s stop  -x SIGINT
+system sh/exec.sh -n dnode6 -s stop  -x SIGINT
+system sh/exec.sh -n dnode7 -s stop  -x SIGINT
+system sh/exec.sh -n dnode8 -s stop  -x SIGINT
\ No newline at end of file