…flush */ innodb_flush_log_at_trx_commit = 1 /* Write log buffer to log and flush to disk */ innodb_flush_log_at_trx_commit = 2 /* Write log buffer to log and flush…recovery. How does this affect throughput? As the REDO log in InnoDB uses a fixed length circular transaction log…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…MySQL…innodb_flush_log_at_trx_commitblogpercona.commanual innodb_flush_methodblogpercona.commanual innodb_force_recoveryblogpercona.commanual Innodb_have_atomic_builtinsblogpercona.commanual innodb_io_capacityblogpercona.commanual innodb_lock_wait_timeoutblogpercona.commanual innodb…rpl_recovery_…
Post: Recovery deleted ibdata1
August 10, 2012 By 9 Comments
… deleted the InnoDB main table space – ibdata1 – and redo logs – ib_logfile*. MySQL keeps InnoDB files open all the time. The following recovery technique is… and wait until InnoDB flushes all pages. To stop write activity we can either stop application or lock tables: mysql> flush tables with read…
Post: InnoDB Flushing: a lot of memory and slow disk
March 31, 2011 By 57 Comments
…; 2) increases recovery time (and that is an important factor with slow disks); and 3) MySQL does not support innodb_log_file_size > 4GB… this (alas, 8 pages flushed). That is, instead of flushing 8 pages what we would expect to be flushed, InnoDB flushes 1 needed page and… why innodb_adaptive_flushing is not able to keep up. What if we disable flushing of neighbor pages (we have the option innodb_flush_neighbor…
Post: What is innodb_support_xa?
March 2, 2011 By 3 Comments
…, but also for internal XA coordination between the InnoDB transaction logs and the MySQL binary logs, to ensure that they are consistent. Consistent is…-of-sync data on replicas (and after point-in-time recovery) when you do that. Unfortunately, the manual isn’t that… disk flushes and get better InnoDB performance. Having innodb_support_xa enabled on a replication master—or on any MySQL server where binary logging is…
Post: Reasons for MySQL Replication Lag
July 29, 2011 By 9 Comments
… problems for replication include setting sync_binlog=1, enabling log_slave_updates, setting innodb_flush_log_at_trx_commit=1. Also note there is… increasing buffer pool size could cause performance problems. MySQL Restart MySQL Restarts may include recovery time but what is the most important they…
Post: How to estimate time it takes Innodb to Recover ?
May 9, 2007 By 7 Comments
…things affecting recovery time you better to understand how Innodb recovery works. When Innodb recovers from logs it finds the last checkpoint time. Innodb has …log replay phase there is also phase of flushing dirty buffers to the disk and undo phase – rolling back uncommitted transactions. As MySQL…
Post: The relationship between Innodb Log checkpointing and dirty Buffer pool pages
February 17, 2012 By 10 Comments
…flushed Innodb Log Checkpointing So, first of all, what can we see about Innodb log checkpointing and what does it tell us? mysql> SHOW ENGINE INNODB STATUS\G — LOG — Log…
Post: How innodb_open_files affects performance
November 18, 2009 By 4 Comments
…Furthermore besides MySQL table_cache Innodb maintains its…time (with innodb_flush_log_at_trx_…InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files… InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer… InnoDB: Doing recovery…
Post: Innodb Recovery - Is large buffer pool always better ?
July 17, 2007 By 3 Comments
…flush_insert_sorted_into_flush_list 37849 2.6804 no-vmlinux (no symbols) 8865 0.6278 mysql…flush list could grow unrestricted without Innodb bothering to flush anything (I only could see reads while recovery…
