MySQL : Permanently getting “ Waiting for table metadata lock”

Question

My MySQL database serves three webapps as the storage backend. However I recently encounter permanantly the error \"Waiting for table metadata lock\". It happen nearly all t

Answer 1

Kill the connection with lock

Kill 1398

Then check if you have autocommit set to 0 by

select @@autocommit;

If yes, you propably forgot to commit transaction. Then another connection want to do something with this table, which causes the lock.

In your case: If you made some query to LogEntries (whitch exists) and did not commit it, then you try to execute CREATE TABLE IF NOT EXISTS from another connection - metadata lock happens.

edit For me the bug is somewhere at your application. Check there, or set autocommit to 1 if your not using transactions in application.

ps also check this posts:

• not a bug on bugs.mysql
• replication of lock on MyISAM and INNOdb tables