… *************************** 3. row *************************** SESSION_ID: 7231 TABLE_SCHEMA: test TABLE_NAME: z ENGINE: InnoDB NAME: #sql516_1c3f_0 TABLE_ROWS: 0… system 294352 (82672 + 211680) Lock system 318875832 (318747272 + 128560) Recovery system 0 (0 + 0) Threads 425080 (406936 + 18144) …
Post: Improving InnoDB recovery time
July 7, 2009 By 12 Comments
Speed of InnoDB recovery is known and quite annoying problem. It was discussed many …=29847 http://dammit.lt/2008/10/26/innodb-crash-recovery/ This is problem when your InnoDB crashes, it may takes long time to… is simple test, I do crash mysql during in-memory tpcc-mysql benchmark with 16 running threads. MySQL params are: innodb_buffer…
Post: Recovering Innodb table Corruption
July 4, 2008 By 19 Comments
… already) 6353 InnoDB: Page may be an index page where index id is 0 25556 InnoDB: (index “PRIMARY” of table “test“.”test“) InnoDB: Database page… edited test.ibd a little more wiping one of the page headers completely. Now CHECK TABLE would crash even with innodb_force_recovery… work well – in this case you may wish to use Innodb Recovery Toolkit which is also helpful in cases you’ve want…
Post: How innodb_open_files affects performance
November 18, 2009 By 4 Comments
… between two tested innodb_open_files values. Finally I decided to test the crash recovery – does it make any difference ? The crash recovery in Innodb is…) Repeating test with innodb_open_files=16384 I got about same crash recovery speed though with no warnings. So it looks like innodb_open…
Post: A recovery trivia or how to recover from a lost ibdata1 file
June 3, 2011 By 7 Comments
…at least be able to recover the data with the Innodb recovery tool of Aleksandr Kuzminsky a colleague on the Percona European…the space ids of the tables mysql> show create table test.tablesG *************************** 1. row *************************** Table: tables Create Table: CREATE TABLE `…
Post: Percona Testing: Innodb crash / recovery tests available
December 21, 2011 By Leave a Comment
… few innodb crash recovery tests available. Some folks have noticed this and asked for something to be done about it, but unfortunately, no tests… the test tables between crash/recovery/validate cycles. To examine this for yourself during a run, you can try the new option –test… (like our shiny new Innodb crash tests!), it is very easy to shuffle data and queries for all tests: ./kewpie.py –suite=innodbCrash…
Post: MySQL Crash Recovery
July 30, 2006 By 26 Comments
… another are kind of worse because they explore many less tested code paths in MySQL and so problem potential is larger… fast is better solution. Innodb Recovery – Unless you have some hardware problems (99%) or found new Innodb bug (1%) Innodb recovery should be automatic and bring your database to consistent state. Depending on innodb_flush_lot_at…
Post: Innodb Recovery Update - The tricks what failed.
May 24, 2007 By 3 Comments
… avoid dumping the data and find some other way to recovery. Examining Innodb page content and crash information we figured out it… be no way to make Innodb avoid touching it. Even when we dropped all Innodb tables (for test purposes) Innodb still was crashing if… with innodb_force_recovery=4 was confirmed to be added in 5.0.33, meaning you could not really recover corrupted Innodb tables…
Post: What is the longest part of Innodb Recovery Process ?
December 20, 2007 By 2 Comments
… MySQL 4.1 and above the longest part of recovery after crash for Innodb tables could be UNDO stage – it was happening… with restarts more than crash recovery as it presents in normal restarts as well – “Opening Tables”. As Innodb has to recompute the… be opened at the same time (though I have not tested if it is still the case with 5.1 which…
Post: Recovery beyond data restore
August 2, 2008 By 11 Comments
… like Innodb corruption or soft crash which you can’t recover promptly enough. In this case most typically you would plan recovery… from several of backup generations and do point in time recovery. Timing recovery is also important. Especially for write intensive environments it… have deployed. Even fewer have gone beyond theory and have tested the processes or have regular testing in place.
