diff --git a/xCAT-server/share/xcat/tools/updateDBM.sql b/xCAT-server/share/xcat/tools/updateDBM.sql
index 115eea3e9..0e2a53721 100755
--- a/xCAT-server/share/xcat/tools/updateDBM.sql
+++ b/xCAT-server/share/xcat/tools/updateDBM.sql
@@ -6,3 +6,4 @@ update dbm cfg using MAX_CONNECTIONS AUTOMATIC;
 update dbm cfg using FENCED_POOL AUTOMATIC;
 update dbm cfg using FCM_NUM_BUFFERS AUTOMATIC;
 update dbm cfg using FCM_NUM_CHANNELS AUTOMATIC;
+update dbm cfg using DIAGSIZE 1024;