diff --git a/perl-xCAT-2.0/xCAT/NotifHandler.pm b/perl-xCAT-2.0/xCAT/NotifHandler.pm
index 445e7f0d4..86148565a 100644
--- a/perl-xCAT-2.0/xCAT/NotifHandler.pm
+++ b/perl-xCAT-2.0/xCAT/NotifHandler.pm
@@ -8,6 +8,8 @@ BEGIN
 use lib "$::XCATROOT/lib/perl";
 
 use File::Basename qw(fileparse);
+use xCAT::Utils;
+use Data::Dumper;
 
 #%notif is a cache that holds the info from the "notification" table.
 #the format of it is:
@@ -156,7 +158,7 @@ sub refreshNotification
         } #end foreach
 
       } #end foreach(@row_array)
-    }end if (@row_array)
+    }#end if (@row_array)
   } #end if ($table)
 
   return 1;
@@ -297,7 +299,7 @@ sub notify {
      # print "modname=$modname, path=$path, suffix=$suffix\n";
     if ($suffix =~ /.pm/) { #it is a perl module
       my $pid; 
-      if ($pid=fork()) { }
+      if ($pid=xCAT::Utils->xfork()) { }
       elsif (defined($pid)) {
 	my $fname;
         if (($path eq "") || ($path eq ".\/")) {
@@ -318,7 +320,7 @@ sub notify {
     }
     else { #it is a command
       my $pid;
-      if ($pid=fork()) { }
+      if ($pid=xCAT::Utils->xfork()) { }
       elsif (defined($pid)) {
         # print "command=$_\n";
         if (open(CMD, "|$_")) {
diff --git a/perl-xCAT-2.0/xCAT/Table.pm b/perl-xCAT-2.0/xCAT/Table.pm
index 8a47c4535..83d262cb3 100644
--- a/perl-xCAT-2.0/xCAT/Table.pm
+++ b/perl-xCAT-2.0/xCAT/Table.pm
@@ -1628,7 +1628,8 @@ sub open
 sub DESTROY
 {
     my $self = shift;
-    if ($self->{dbh}) { $self->{dbh}->disconnect(); undef $self->{dbh};}
+    undef $self->{dbh};
+    #if ($self->{dbh}) { $self->{dbh}->disconnect(); undef $self->{dbh};}
     undef $self->{nodelist};    #Could be circular
 }
 
diff --git a/perl-xCAT-2.0/xCAT/Utils.pm b/perl-xCAT-2.0/xCAT/Utils.pm
index 2fd2eb214..fe2a1654a 100644
--- a/perl-xCAT-2.0/xCAT/Utils.pm
+++ b/perl-xCAT-2.0/xCAT/Utils.pm
@@ -5,6 +5,7 @@ use xCAT::Table;
 use xCAT::Schema;
 use Data::Dumper;
 use xCAT::NodeRange;
+use DBI;
 
 #--------------------------------------------------------------------------------
 
@@ -94,6 +95,35 @@ sub isAIX
     else { return 0; }
 }
 
+#-------------------------------------------------------------------------------
+
+=head3	tfork
+	forks, safely coping with open database handles
+	Argumens:
+		none
+	Returns:
+		same as fork
+=cut
+sub tfork {
+	my $rc=fork;
+	unless (defined($rc)) {
+		return $rc;
+	}
+	unless ($rc) {
+          my %drivers = DBI->installed_drivers;
+          foreach my $drh (values %drivers) {
+            foreach (@{$drh->{ChildHandles}}) {
+                $_->{InactiveDestroy} = 1;
+            }
+            foreach (@{$drh->{ChildHandles}}) {
+                undef $_;
+            }
+	  }
+        }
+	return $rc;
+}
+	
+
 #-------------------------------------------------------------------------------
 
 =head3    isLinux
diff --git a/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm b/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
index f2618aebe..daf7376a4 100644
--- a/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
+++ b/xCAT-server-2.0/lib/xcat/monitoring/monitorctrl.pm
@@ -75,7 +75,7 @@ sub start {
   #start monitoring for all the registered plug-ins in the monitoring table.
   #better span a process so that it will not block the xcatd.
   my $pid;
-  if ($pid=fork()) {#parent process 
+  if ($pid=xCAT::Utils->xfork()) {#parent process 
     #print "parent done\n";
     return 0;
   }
@@ -647,6 +647,7 @@ sub processNodeStatusChanges {
     xCAT::MsgUtils->message("E", "Could not read the nodelist table\n");
   }
 
+  $tab->close;
   return 0;
 }
 
diff --git a/xCAT-server-2.0/lib/xcat/plugins/tabutils.pm b/xCAT-server-2.0/lib/xcat/plugins/tabutils.pm
index 9a53fe9b1..cea531c26 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/tabutils.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/tabutils.pm
@@ -467,7 +467,9 @@ sub tabgrep {
     if ($tab->getNodeAttribs($node->[0],["node"])) {
 			$callback->({data=>[$_]});
 		}
+     $tab->close;
 	}
+
 }