… be a good idea. It also often helps with monopolizing replication thread. For example if I need to delete old data…
Post: Infinite Replication Loop
October 10, 2011 By 2 Comments
…]). As we are in multi-master replication, the other master should also replicate events : Closer look: Infinite Replication Loop flow: If you have master… set to 1. How to identify an infinite replication loop ? When you have an infinite replication loop, the value of Seconds_behind_master will…
Post: Fighting MySQL Replication Lag
September 22, 2008 By 6 Comments
… – this can be running update/delete with LIMIT in the loop, controlling maximum amount of values per batch in multiple row… this functionality. Finally you should not overload your replication – Quite typically I see replication lagging when batch jobs are running. These can… fast enough and at the same time keep replication from lagging. In many bad replication lags I’ve seen simply following these…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… fixed-length. One reason denormalization is important is that nested-loop joins on large data sets are very expensive. If… and archiving data can be dramatic. Take It Easy On Replication Building aggregated tables is hard work for the database server… with LOAD DATA INFILE, which kind of emulates row-based replication in a way. When you’re updating big aggregate tables…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
….commanual replicate_do_dbblogpercona.commanual replicate_do_tableblogpercona.commanual replicate_ignore_dbblogpercona.commanual replicate_ignore_tableblogpercona.commanual replicate_rewrite_dbblogpercona.commanual replicate_same_server_idblogpercona.commanual replicate_wild_do_tableblogpercona.commanual replicate…
Comment: Thoughts on MySQL Replication
July 9, 2006 By 18 Comments
… many changes also can cause spike in delay of MySQL replication as all statements from transaction will have to be accomulated… DELETE … LIMIT 1000 and executing it in the loop until no more loops can be deleted. If delete is using index to…
Post: Is your MySQL Application having Busy IO by Oracle Measures ?
January 8, 2012 By 1 Comment
… exceptional for traditional MySQL as MySQL optimizer with its nested loops joins does not favor sequential scans even for analytic queries… system (including powerful storage) – Is quite limited with single thread replication as well as other restrictions. As Vadim points out in… online operations to alter table, defragmentation etc. Yes there are replication based and trigger based techniques to archive this but it…
Comment: Infinite Replication Loop
October 10, 2011 By 2 Comments
At Opera, we are building a multi-master solution: https://github.com/alfie/MySQL–Replication Since replication is peer-to-peer rather than circular, you have the benefit of having multiple masters without the infinite loops. For more info: http://www.youtube.com/watch?v=lk-2XE00fqY
Comment: Using MyISAM in production
June 19, 2006 By 35 Comments
… anyway as otherwise it will not be replicated if you do not use bi-directional replication. I also agree with your recommendation… example I quite frequently used DELETE … LIMIT 100; in the loop to avoid long table locks. You should however still watch…
Post: Percona Server 5.1.58-12.9
August 17, 2011 By 2 Comments
… isn’t needed. Bug Fixed: #803270 (Yasufumi Kinoshita). A remaining loop from an unimplemented feature degraded the performance when using compressed… the closed table was on the FEDERATED engine and a replication environment, its client connection to the remote server was closed…
