diff --git a/tests/army/enterprise/s3/s3Basic.py b/tests/army/enterprise/s3/s3Basic.py
index 0933295e81..3f95ddab3e 100644
--- a/tests/army/enterprise/s3/s3Basic.py
+++ b/tests/army/enterprise/s3/s3Basic.py
@@ -43,6 +43,7 @@ s3UploadDelaySec 60
 
 class TDTestCase(TBase):
     updatecfgDict = {
+        "supportVnodes":"1000",
         's3EndPoint': 'http://192.168.1.52:9000', 
         's3AccessKey': 'zOgllR6bSnw2Ah3mCNel:cdO7oXAu3Cqdb1rUdevFgJMi0LtRwCXdWKQx4bhX', 
         's3BucketName': 'ci-bucket',
@@ -236,9 +237,14 @@ class TDTestCase(TBase):
 
     #
     def preDb(self, vgroups):
-        vg = int(time.time()*1000)%10 + 1
-        sql = f"create database predb vgroups {vg}"
-        tdSql.execute(sql, show=True)
+
+        cnt = int(time.time())%3 + 1
+        for i in range(cnt):
+             vg = int(time.time()*1000)%10 + 1
+             sql = f"create database predb vgroups {vg}"
+             tdSql.execute(sql, show=True)
+             sql = "drop database predb"
+             tdSql.execute(sql, show=True)
 
     # history
     def insertHistory(self):