diff --git a/inc/toolsdef.h b/inc/toolsdef.h
index f2a5104b..aaf918b8 100644
--- a/inc/toolsdef.h
+++ b/inc/toolsdef.h
@@ -223,7 +223,6 @@ int32_t       toolsCloseDir(TdDirPtr *ppDir);
 
 int64_t atomic_add_fetch_64(int64_t volatile* ptr, int64_t val);
 int32_t toolsGetNumberOfCores();
-int32_t toolsGetPhysicalMemory();
 
 int64_t toolsGetTimestamp(int32_t precision);
 void    toolsMsleep(int32_t mseconds);
diff --git a/src/benchInsert.c b/src/benchInsert.c
index 64d0a65b..e2f9853d 100644
--- a/src/benchInsert.c
+++ b/src/benchInsert.c
@@ -493,7 +493,6 @@ int32_t getVgroupsOfDb(SBenchConn *conn, SDataBase *database) {
 }
 #endif  // TD_VER_COMPATIBLE_3_0_0_0
 
-
 int32_t toolsGetDefaultVGroups() {
     int32_t cores = toolsGetNumberOfCores();
     if (cores < 3 ) {
@@ -531,7 +530,7 @@ int geneDbCreateCmd(SDataBase *database, char *command, int remainVnodes) {
                             database->dbName,
                             (-1 != g_arguments->inputted_vgroups)?
                             g_arguments->inputted_vgroups:
-                            min(remainVnodes, toolsGetDefaultVGroups()));
+                            min(remainVnodes, toolsGetNumberOfCores()));
     } else {
         n = snprintf(command + dataLen, SHORT_1K_SQL_BUFF_LEN - dataLen,
                     g_arguments->escape_character