Dear Sir, Thanks for your valuable answer. But I am maintaining some connection pool and I am querying DB in regular interval. Now also this problem occurs. Even if we assume that this problem occurs due to the reason as suggested by you, why this error happens when there is no data base operation for a long period of time. Please let me know, is there any configuration to be done in mysql to avoid this error or to completely resove this error. It is very very helpful for me if you please suggest the solution Thanks and regards, Saravanakumar.M ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=1 --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php