…_TIME: 2012-03-21 05:52:02 UPDATE_TIME: NULL *************************** 3. row *************************** SESSION_ID: 7231 TABLE_SCHEMA: test TABLE_NAME: z ENGINE: InnoDB…: 16384 INDEX_LENGTH: 0 CREATE_TIME: NULL UPDATE_TIME: NULL 3 rows in set (0.00 sec) Innodb Memory Usage Finally it is… and will result in increased memory allocation until server is restarted. I would suspect memory leak when you see memory usage…
Post: ANALYZE: MyISAM vs Innodb
September 3, 2008 By 9 Comments
…. For Innodb as index stats are computed first time table is accessed after restart this often means “never” because MySQL servers are restarted frequently… value changed to become 15 times larger. So Innodb stats are both inexact and unstable. So restarting server with Innodb may change stats dramatically…
Post: Magic Innodb Recovery self healing
May 22, 2007 By 2 Comments
… (in this particular corruption instance Innodb did not print table name in question), drop tables, restart Innodb without innodb_force_recovery and load them… with innodb_force_recovery=4. So I decided to check if I’m to get lucky second time today. And Indeed Restarting Innodb with innodb…
Post: What is the longest part of Innodb Recovery Process ?
December 20, 2007 By 2 Comments
… using innodb_file_per_table so “InnoDB: Reading tablespace information from the .ibd files…” stage was taking most of the time. Happily Innodb only needs to scan .ibd files when it was not shut down correctly otherwise restarts would be… restarts more than crash recovery as it presents in normal restarts as well – “Opening Tables”. As Innodb has to recompute the stats first time…
Post: How InnoDB handles REDO logging
February 3, 2011 By 18 Comments
… the event of volatile memory failure or during a system restart InnoDB can guarantee to have a (C)onsistent record of the… log needs to be able to be redone multiple times since at restart and media recovery we will not know if that… the time to log is added to every update it can become an important overhead to your response time. Indeed if InnoDB cannot…
Comment: How to estimate time it takes Innodb to Recover ?
June 25, 2008 By 7 Comments
…, PROBLEM: mysqld frequently restarts w/o apparent or visible reasons yet: Would this be related to long INNODB recovery time, to the point it will do self service-restart? In hopes to clear confusions… mysqld restarted InnoDB: Log scan progressed past the checkpoint lsn 16 3276587130 080626 0:06:16 InnoDB: Database was not shut down normally! InnoDB…
Post: Percona Testing: Innodb crash / recovery tests available
December 21, 2011 By Leave a Comment
…, subject the master to a transactional load, crash the master, restart it, then ensure the master and slave are in sync… of master-slave checksums after the master has crashed and restarted: $ ./kewpie.py –suite=innodbCrash –basedir=mysql-5.5 –test-debug… –randgen-seed=time. For those test cases that are written to take advantage of this (like our shiny new Innodb crash tests…
Post: Percona Server 5.5.13-20.4 Stable Release
July 1, 2011 By 3 Comments
… improvements in restart performance. Replacement is due to SHM buffer pool both being very invasive and not widely used. Improved restart times are… warnings will be printed for the deprecated options (innodb_buffer_pool_shm_key and innodb_buffer_pool_shm_checksum) if used. Instructions…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… can happen at the same time. How many read-aheads can be waiting in Queue when or Innodb will schedule more read… performance enhancement requests. It takes time for the patches to mature. We improved the scalability of InnoDB-5.0.30 in December… up just as RAID cache so it can handle system restarts. When putting log files on such device could give great…
Post: Faster Point In Time Recovery with LVM2 Snaphots and Binary Logs
February 23, 2012 By Leave a Comment
….e. updates on CentOS. If you are using InnoDB, it is also important that your transaction logs (… so we can skip that after the snapshot restart. Using the below command and some inline searches, … you cannot test restore your snapshots – they are one time use! However, if you can tolerate the extra …
