vb db hatası alıyorum

Arkadaşlar şöyle bir hata mailime geliyor arada.
Sql hatası dolayısı ilede şuanda sitede yavaşlama problemş çekiyorum.
Bu sorunu nasıl halledebilirim.

Database error in vBulletin 3...:
 
Invalid SQL:
 
		SELECT
			user.username, (user.options & 512) AS invisible, user.usergroupid,
			session.userid, session.inforum, session.lastactivity,
			IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid, infractiongroupid
		FROM session AS session
		LEFT JOIN user AS user ON(user.userid = session.userid)
		WHERE session.lastactivity > 1277739924
		ORDER BY username ASC;
 
MySQL Error  : Query execution was interrupted
Error Number : 1317
Date         : Monday, June 28th 2010 @ 08:18:45 PM
Script       : http://www.....com/index.php
Referrer     : http://www......com/test-drive-unlimited-tek-link-t5157.html?
IP Address   : 88.....49...
Username     : Kayıtsız Üye
Classname    : vB_Database

2.olarak Bir diger mail ise şöyle

Database error in vBulletin :
 
mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
/home/user/public_html/includes/class_core.php on line 274
 
MySQL Error  : 
Error Number : 
Date         : Monday, June 28th 2010 @ 08:18:46 PM
Script       : http://www.......com/forumdisplay.php?f=164&page=1
Referrer     : http://www.....com
IP Address   : ....62.....87
Username     : 
Classname    : vB_Database

3. olarak Bu mailden birkaç tane gelmiş.

Database error in vBulletin 3.6.8:
 
Invalid SQL:
 
				SELECT *
				FROM session
				WHERE sessionhash = 'bc6b4bc8d555e4e4d0c608d217814a84'
					AND lastactivity > 1277739922
					AND idhash = '80a3480ded2eaa6914efa13f092b67e4';
 
MySQL Error  : MySQL server has gone away
Error Number : 2006
Date         : Monday, June 28th 2010 @ 08:18:46 PM
Script       : http://www......com/s4-hack-kolay-kullanisli-t64314.html
Referrer     : http://www......com/s4-league-hack-hileleri-f348.html
IP Address   : ....183....73
Username     : 
Classname    : vB_Database

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