diff --git a/perl-xCAT/xCAT/DBobjUtils.pm b/perl-xCAT/xCAT/DBobjUtils.pm
index 2c8a8212a..3e9fdafee 100644
--- a/perl-xCAT/xCAT/DBobjUtils.pm
+++ b/perl-xCAT/xCAT/DBobjUtils.pm
@@ -224,7 +224,7 @@ sub getobjattrs
 						}
 					}
 				}
-				$thistable->commit;
+				#$thistable->commit;
 			}
 	  	}
 	}
@@ -614,7 +614,7 @@ sub getDBtable
 
         @{$::TableHash{$table}} = @rows;
 
-    	$thistable->commit;
+    	#$thistable->commit;
 
 	} # end if not cached
 
diff --git a/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm b/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
index e0481855d..fdf70604c 100644
--- a/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
+++ b/xCAT-server/lib/xcat/plugins/DBobjectdefs.pm
@@ -1155,6 +1155,7 @@ sub defmk
                   xCAT::Table->new('nodelist', -create => 1, -autocommit => 0);
 
                 my $newgroups;
+                my $changed=0;
                 foreach my $n (@memberlist)
                 {
                     if ($::verbose)
@@ -1192,11 +1193,13 @@ sub defmk
                     if ($newgroups)
                     {
                         $tab->setNodeAttribs($n, {groups => $newgroups});
+			$changed=1;
                     }
 
                 }
-
-                $tab->commit;
+		if ($changed) {
+		    $tab->commit;
+		}
 
 
             }