…mysql> stop slave; mysql> change master to master_port=10002; mysql> start slave; Those of you who have already done these operations with file-based replication…
Comment: How to lag a slave behind to avoid a disaster
April 25, 2013 By 5 Comments
…mysql ‘start slave until master-log-file master-log-pos’ reliable enough to synch up two slaves with their master… 2 behind slave1 to make it a chain replication , master => slave 1 = > slave 2. The only option I see to stop slave on slave2 and wait a few seconds…
Post: Managing Slave Lag with MySQL Replication
October 12, 2007 By 15 Comments
… seconds or even longer. There are multiple reasons why application falls behind and why we see those lag spikes: Slave Server Load – MySQL Replication… know how to measure replication lag – MySQL Toolkit has a great tool for real latency measurement. Do not trust Seconds_Behind_Master too much, even…
Post: Infinite Replication Loop
October 10, 2011 By 2 Comments
… two actual masters. Let’ s have a look first at the normal flow: Replication flow: [1] When you setup MySQL replication, you … replication loop ? When you have an infinite replication loop, the value of Seconds_behind_master will have many randomly looking values. The value of Seconds_behind_master…
Post: How to Monitor MySQL with Percona's Nagios Plugins
February 22, 2012 By 11 Comments
… needed. Replication is one thing that needs to be monitored in two dimensions, which shouldn’t be combined: delay (Seconds_behind_master or the delay indicated by the pt-heartbeat tool, if you choose), and actual failure. The pmp-check-mysql-replication-delay…
Post: Here's a quick way to Foresee if Replication Slave is ever going to catch up and When!
August 29, 2012 By 11 Comments
… times new replication slave is built from a backup which is normally hours behind, or, it could be that replication slave became too… did that something in awk: delay=60 cmd=”mysql -e ‘show slave status\G’ | grep Seconds_Behind_Master | awk ‘{print \$2}’” while sleep $delay; do…
Post: How to lag a slave behind to avoid a disaster
September 11, 2012 By 5 Comments
MySQL Replication is useful and easy to setup. It is used for …:50:31 slave running 672 seconds behind 2012-09-10T12:50:31 slave running 672 seconds behind at master position mysql-bin.000001/233713063 slave1 [localhost…
Post: Finding your MySQL High-Availability solution – Replication
November 13, 2009 By 6 Comments
…a second …MySQL replication. All writes are going to the master while reads are spread between the master and the slave. Upon failure of the master, replication…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: How does MySQL Replication really work?
January 9, 2013 By 9 Comments
…MySQL replication, but my main focus will be the logistics – how replication events are written on the master, how they are transferred to the replication…master status\G” from the master. 2. SQL thread The second process – SQL thread – reads events from a relay log stored locally on the replication…
Post: How SHOW SLAVE STATUS relates to CHANGE MASTER TO
July 7, 2008 By 21 Comments
… know MySQL Replication (statement based) works by fetching statements from MASTERs binary log and executing them on the SLAVE. Since MySQL 4….Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 …
