…innodb_status_fileblogpercona.commanual innodb_strict_modeblogpercona.commanual innodb_support_xablogpercona.commanual innodb_sync_spin_loopsblogpercona.commanual innodb_table_locksblogpercona.commanual innodb_thread_concurrencyblogpercona.commanual innodb…
Post: A quest for the full InnoDB status
October 31, 2008 By 4 Comments
… the status file on disk even if you do not specify innodb-status-file option. The file is actually used for every SHOW ENGINE InnoDB STATUS call, so whenever someone runs the command, InnoDB writes…
Post: Innodb Table Locks
July 31, 2012 By 4 Comments
… SHOW ENGINE INNODB STATUS while concurrent updates to this table will be prevented until it is unlocked. What does this illustrate ? Very simple – SHOW INNODB STATUS does not know anything about MySQL level locks, so table locked on MySQL level with LOCK TABLES will not show up…
Post: How much memory Innodb locks really take ?
July 13, 2006 By 11 Comments
…) | +———-+ | 1638400 | +———-+ 1 row in set (7.02 sec) Looking at SHOW INNODB STATUS we can see: History list length 5 Total number of…(*) | +———-+ | 102216 | +———-+ 1 row in set (4.44 sec) Looking at SHOW INNODB STATUS we can see: Total number of lock structs in row…
Post: How SHOW SLAVE STATUS relates to CHANGE MASTER TO
July 7, 2008 By 21 Comments
…” – shutting down MySQL Server and copying data, using LVM, Using Innodb Hot Backup Tool, Using another Slave, using backup image etc… are two sources of information for binary log position SHOW MASTER STATUS – this shows position as master writes its own binary and is… make another one you need to use SHOW SLAVE STATUS which provides much more information. mysql> show slave status\G *************************** 1. row *************************** Slave_IO…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… rules can be established. I have assigned Inaam as the InnoDB scalability engineer. We do not have much resources for scalability… database brands. Q37: We have a fairly large Innodb table (150GB) that is showing poor performance for full table scans. using O… primary key lookups or not showed up in “show innodb statusâ€. select * from table where id=5 show innodb status: Hash table size 10624987…
Post: Why ALTER TABLE shows as two transactions in SHOW ENGINE INNODB STATUS
July 1, 2012 By 4 Comments
… create two InnoDB transactions: One transaction is created when the table being ALTERed is locked by the server. This will show up as something like “TABLE LOCK table `schema`.`table_name` trx id XXXX lock mode S” in SHOW ENGINE INNODB STATUS. Another is created when adding or dropping an index to perform operations on the InnoDB data dictionary. A…
Post: When does Innodb Start Transaction ?
January 11, 2011 By 9 Comments
…. Run “SHOW INNODB STATUS” and you will see “not started” status in transaction list. It is only when you read (or write) to INNODB table… 139753656395520 MySQL thread id 112, query id 411 localhost root show innodb status Trx read view will not see trx with id >= F56AEE… this mode will NOT start transaction however reading or writing Innodb table will. I would call it delayed transaction creation – having…
Post: Understand InnoDB spin waits, win a Percona Live ticket
September 2, 2011 By 2 Comments
… from SHOW INNODB STATUS mean? Mutex spin waits 5870888, rounds 19812448, OS waits 375285 To understand this text, you have to understand how InnoDB… to sleep right away. So, back to the output from SHOW INNODB STATUS. Here’s what it means. Mutex spin waits 5870888 is… know a little bit more about InnoDB locking strategies and how it’s exposed in the status output, wouldn’t you like…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… modified. Q21: What’s the status of INNODB in 5.1.x? Specifically: What’s the current status of innodb_thread_concurrency ? Is it… seeing ‘thread thrashing’ (lots of threads waiting for semaphores in SHOW INNODB STATUS), you can try to disable thread throttling completely by setting…
