MySQL Error: Lock wait timeout exceeded

[milleniumstudio]

I have vBulletin 4.0.3 on MySQL 5.0.32 and sometimes get these errors:

Database error in vBulletin 4.0.3:

Invalid SQL:

REPLACE INTO vb_searchlog
(userid,ipaddress,searchhash,sortby,sortorder,sear chtime,dateline,completed,criteria,results)
VALUES
(...)

MySQL Error : Lock wait timeout exceeded; try restarting transaction
Error Number : 1205
Request Date : (...)
Error Date : (...)
Script : /search.php?do=getnew&contenttype=vBForum_Post
Referrer : (...)
IP Address : (...)
Username : (...)
Classname : vB_Database_MySQLi
MySQL Version :

What's the cause and to solve them?

[Marco van Herwaarden]

What is the "innodb_lock_wait_timeout" set to in the MySQL config?

[Videx]

And can we assume the CPU loads around the times of the errors are acceptable? Is this shared hosting?

[milleniumstudio]

innodb_lock_wait_timeout is set to 50. The average total queries per second is 34. Do you think increasing timeout will do?

[Marco van Herwaarden]

Should already be enough. Most likely another process locking things up. Try to get a innodb ststus when this happens.