…it is least intrusive. Run SHOW ENGINE INNODB STATUS and look for memory information block, which can use like this: ———————- BUFFER POOL… File system 294352 (82672 + 211680) Lock system 318875832 (318747272 + 128560) Recovery system 0 (0 + 0) Threads 425080 (406936 + 18144) Dictionary …
Comment: How FLUSH TABLES WITH READ LOCK works with Innodb Tables
March 24, 2012 By 20 Comments
… be recoverable 100% of the time. You might have found recovery bug but there have been very few of them. Typically… synchronization of binary log and innodb snapshot. In certain versions FLUSH TABLES WITH READ LOCK would not block “commit” operation which caused…
Post: Recovering Innodb table Corruption
July 4, 2008 By 19 Comments
… back from simple Innodb Table Corruption. In more complex cases you may need to use higher innodb_force_recovery modes to block purging activity, insert buffer merge or recovery from transactional logs all together. Though the lower recovery mode… work well – in this case you may wish to use Innodb Recovery Toolkit which is also helpful in cases you’ve want…
Post: The relationship between Innodb Log checkpointing and dirty Buffer pool pages
February 17, 2012 By 5 Comments
… Innodb stops (read: crashes) with dirty buffer pool pages, Innodb recovery must be done to rebuild the last consistent picture of the database. Recovery… back Innodb will allow us to go in the transaction logs; our Checkpoint age cannot exceed this without blocking client operations in Innodb… losing data on a crash, so Innodb does not permit such an operation and will block incoming writes until the space is…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…innodb_max_purge_lagblogpercona.commanual innodb_mirrored_log_groupsblogpercona.commanual innodb_old_blocks_pctblogpercona.commanual innodb_old_blocks_timeblogpercona.commanual innodb_open_filesblogpercona.commanual Innodb…report_userblogpercona.commanual rpl_recovery_rankblogpercona.commanual Rpl_…
Post: Why you can't rely on a replica for disaster recovery
July 31, 2010 By 25 Comments
… corrupted data files. After running fsck on the replica, the InnoDB data files were entirely deleted. When we arrived on the… filesystem level. From InnoDB‘s point of view, though, it was still completely corrupted. The “InnoDB file” contained blocks of data that were… and 2) don’t trust the advice; backups and disaster recovery plans must be tested periodically. This case illustrates an important…
Post: InnoDB Flushing: Theory and solutions
April 4, 2011 By 23 Comments
… system failure, InnoDB is logging changes into InnoDB transaction logs. The size of the InnoDB transaction log defines how many changed blocks we can… simply have a gigantic InnoDB transaction log? The answer is that the size of the transaction log affects recovery time after a crash. The bigger the log, the longer the recovery time. Okay, so we have innodb_log_file…
Comment: MySQL on Amazon RDS part 2: Determining Peak Throughput
March 28, 2011 By 4 Comments
…innodb_force_recovery 0 innodb_io_capacity 200 innodb_lock_wait_timeout 50 innodb_locks_unsafe_for_binlog OFF innodb_log_buffer_size 8388608 innodb…
Post: Innodb Double Write
August 4, 2006 By 23 Comments
… which case Innodb will skip page upate operation or “former” in which case Innodb will perform update. If page is inconsistent recovery can… splitting could be file fragmentation – most file systems use 4K block sizes by default so 16K could use more than one… real location and fsync() called the second time. Now on recovery Innodb checks doublewrite buffer contents and pages in their original location…
Post: 10 things you need to know about backup solutions for MySQL
March 3, 2009 By 23 Comments
…? If not, what is the impact on the running server? Blocking, I/O load, cache pollution, etc? What technique is used… can perform point-in-time recovery? How does the system guarantee consistency with the binary log, InnoDB logs, and replication? Can you… that the backup is restorable, e.g. does it run InnoDB recovery before declaring success? Does anyone stand behind it with support…
