… your test case is waiting on InnoDB row locks by setting innodb_lock_wait_timeout to 1 and then issuing the ALTER: — session…; — session 2 set innodb_lock_wait_timeout=1; alter table t1 engine=innodb; And the alter will timeout after approximately a second with the following error: ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
Post: MySQL 5.6 Compatible Percona Toolkit 2.2 Released
March 25, 2013 By 2 Comments
…, we removed –lock-wait-timeout which set innodb_lock_wait_timeout because that now conflicts, or is at least confused with, lock_wait_timeout (introduced in MySQL 5.5) for metadata locks…
Post: MySQL 5.5 lock_wait_timeout: patience is a virtue, and a locked server
February 28, 2013 By 5 Comments
… something about lock_wait_timeout that shocked me. From the MySQL 5.5 docs for lock_wait_timeout: This variable specifies the timeout in seconds for attempts to acquire metadata locks. The permissible values range…
Post: InnoDB's gap locks
March 27, 2012 By 15 Comments
… 1205 (HY000): Lock wait timeout exceeded; try restarting transaction transaction2 > INSERT INTO t VALUES(29); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction transaction2 > INSERT INTO t VALUES(23); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting…
Post: Implications of Metadata Locking Changes in MySQL 5.5
February 1, 2013 By 9 Comments
… in the table_cache change anything with respect to metadata locks. Metadata Locking and Table Cache No matter if a connection accesses… unintended consequences. A workaround here would be to set lock_wait_timeout variable to a very low value and then execute the… (however due to a different reason): session2 > set session lock_wait_timeout=1;CREATE TABLE t1(i int(11) not null auto…
Post: ACTIVE with Locks – Now thats a problem !
June 2, 2011 By 2 Comments
… when you have long enough ACTIVE transactions which have some locks, like in this case: MySQL thread id 2059, query id… query will try to lock the same rows it will have to wait… possibly until innodb_lock_wait_timeout elapses and when it… are recycled it might be good idea to set wait_timeout to some reasonable value, say 60 seconds. In this case…
Post: Percona XtraDB Cluster Feature 2: Multi-Master replication
January 19, 2012 By 22 Comments
… to two different nodes, the cluster will use an optimistic locking model. That means a transaction will not check on possible locking conflicts during individual queries, but rather on the COMMIT stage. … InnoDB, that you may experience. In InnoDB usually DEADLOCK and LOCK TIMEOUT errors happen in response on particular query, but not on…
Comment: Pitfalls of converting to InnoDB
February 26, 2007 By 16 Comments
These lock timeouts imply that you have some long running queries (or that … better off looking for the source of the long running lock rather than wrapping all your queries in a retry script…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…_row_lock_current_waitsblogpercona.commanual Innodb_row_lock_timeblogpercona.commanual Innodb_row_lock_time_avgblogpercona.commanual Innodb_row_lock_time_maxblogpercona.commanual Innodb_row_lock…_zoneblogpercona.commanual table_definition_cacheblogpercona.commanual table_lock_wait_timeoutblogpercona.commanual Table_locks_immediateblogpercona.commanual Table_locks_waitedblogpercona.commanual table_open_cacheblogpercona.commanual…
Comment: InnoDB's gap locks
May 7, 2012 By 15 Comments
…): Lock wait timeout exceeded; try restarting transaction root@localhost:test 14:38:03>insert into t values(23); ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction root@localhost:test 14:44:37>insert into t values(31); ERROR 1205 (HY000): Lock wait timeout…
