… make replication lag for over 24 hours until they all could be done with. Slave Read Traffic Changes Slave read traffic impacts replication performance dramatically… slave never is able to catch up. MySQL or OS version changesMySQL version changes (even minor upgrade) may introduce issues which causes replication lag…
Post: Percona Replication Manager, a solution for MySQL high availability with replication using Pacemaker
November 29, 2011 By 94 Comments
… If replication on a slave breaks or lags beyond a defined threshold, the reader VIP(s) is removed. MySQL is not restarted. If no slaves…=”/etc/mysql/my.cnf” pid=”/var/run/mysqld/mysqld.pid” \ socket=”/var/run/mysqld/mysqld.sock” replication_user=”root” \ replication_passwd=”rootpass” max_slave_lag…
Post: Fighting MySQL Replication Lag
September 22, 2008 By 6 Comments
… in low hanging fruit troubleshooting MySQL Replication Lag First fact you absolutely need to remember is MySQL Replication is single threaded, which means …replication lagging when batch jobs are running. These can load master significantly during their run time and make it impossible for slave…
Post: Getting use of Slave in MySQL Replication
February 14, 2007 By 15 Comments
MySQL Replication is asynchronous which causes problems if you would like to use MySQL Slave as it can contain stale data. It is true… master which not take time to replicate to the slave replication lag can be significant. Also even very small lag can cause the problems – for… replication is running properly and if replication lag is within the limit. It may be good idea to exclude slaves from the reads if lag…
Post: Infinite Replication Loop
October 10, 2011 By 2 Comments
… those graphs: You can see the CPU usage and the replication lag… once again cacti is very helpful ! How to fix then….1/en/replication-options-slave.html#option_mysqld_replicate-same-server-id [3] http://dev.mysql.com/doc/refman/5.1/en/replication-options-slave.html#option_mysqld_log-slave…
Post: Managing Slave Lag with MySQL Replication
October 12, 2007 By 11 Comments
… to keep Slave load under control and avoid load spikes as load spikes will frequently cause replication lag spikes as well. Locks – MySQL Replication SQL… manage replication lag and to understand what is loading your replication it is also helpful to examine execution time of queries being replicated. Unfortunately MySQL…
Post: Finding your MySQL High-Availability solution – Replication
November 13, 2009 By 6 Comments
… need to setup MySQL replication between a master and one or more slaves. Upon failure of the master, one of the slaves is manually…, is the asynchronous design of MySQL replication which does not allow the master to be sure the slave has been updated before returning… replication on one of the MySQL servers lags behind too much, its read VIP will be moved to another server. As a conclusion, replication…
Post: Three ways to know when a MySQL slave is about to start lagging
October 8, 2008 By 8 Comments
… with slave lag is that you often can’t see it coming. Especially if the slave‘s load is pretty uniform, a slave that…: One: watch for spikes of lag. If you have Cacti (and these Cacti templates for MySQL) you can see this in the… two replication threads on the slave) to see how much of the time the slave thread was actively processing statements. If the slave threads…
Post: Thoughts on MySQL Replication
July 7, 2006 By 18 Comments
… bulk query on the master, even on completely unrelated table, replication lag may increase dramatically. Besides monitoring which Brian mentioned three other…’re accessing to be cached in memory by MySQL cache or OS cache. As slaves replicate the same data and often queried in…. So in which case I would go using simple master slave replication ? – Small database size. Small meaning working set fits in memory…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…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…
