MySQL Replication is asynchronous which causes problems if you would like to use MySQL Slave as it can contain stale data. It is true delay… was running some heavy queries on the master which not take time to replicate to the slave replication lag can be significant. Also even…
Post: MySQL Replication vs DRBD Battles
April 28, 2008 By 12 Comments
…MySQL features which break replication. The failover node is a hot standby, it’s just not a running slave…MySQL Master-Master replication…MySQL Replication, such as filtered replication or cross storage engine replication, though which are not typically used for HA purposes. Time Delayed replication…
Post: How expensive is MySQL Replication for the Master
January 16, 2010 By 13 Comments
… generally thought about MySQL replication as being quite low overhead on Master, depending on number of Slaves. What kind of load extra Slave causes ? Well… slave. If you have large amount of slaves the delay from the event executed on the master to last thread sends packet to the slave…
Post: Recovery beyond data restore
August 2, 2008 By 11 Comments
…delayed replication (which you already could have set up with mk-slave-delay from Maatkit. Delayed slave is especially helpful if application can operate with just master…
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
…new replication slave is built from a backup which is normally hours behind, or, it could be that replication slave became too…delay=60 cmd=”mysql -e ‘show slave status\G’ | grep Seconds_Behind_Master | awk ‘{print \$2}’” while sleep $delay; do eval $cmd done | awk -v delay=$delay ‘ { passed += delay…
Post: Making MySQL Replication Parallel
January 30, 2007 By 1 Comment
… without changing MySQL Replication semantics – which is – Slave database state corresponds to master database state at certain point in time. It is delayed but threads… log file and setup multi-master replication so slave can read all of them in parallel you can get replication parallel enough for many…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… provide the freshest data to their own clients, with no delays. Finally, the analysis is usually multi-dimensional. The typical…-based replication, or in MySQL 5.0 and earlier, doing the work on a slave, then piping the results back up to the master with LOAD DATA INFILE, which kind of emulates row-based replication in…
Comment: Percona Server 5.5.15 + Galera 21.1-beta2
October 4, 2011 By 18 Comments
…. .i.e. write set will not be applied in slaves during replication, the replication delay is proportional to network RTT. Note that Galera does… for certain SQL load profiles. MySQL asynchronous replication can indeed enable master to process faster, with the expense of slave lag. But is this…
Post: Just how useful are binary logs for incremental backups?
July 21, 2009 By 6 Comments
…replication slaves lagging behind masters before, but …Master-Slave topology. The database size is 100 GB (same tables on each). The slave machine barely keeps up with the master…to either try and time delay slaves (to keep them close … by a MySQL Server feature – parallel execution on slaves. …
Post: Percona XtraDB Cluster (PXC): what about GRA_*.log files ?
December 19, 2012 By Leave a Comment
…_ Those files correspond to a replication failure. That means the slave thread was not able to …MySQL replication log [root@node2 mysql]# mysqlbinlog -vvv GRA_3_3-bin.log /*!40019 SET @@session.max_insert_delayed_threads=…HA_ERR_FOUND_DUPP_KEY; the event’s master log FIRST, end_log_pos 106, Error_code…
