MySQL backup to file, gzip and load in one step
Taxonomy upgrade extras: BackupcompressWhen a MySQL Slave is set-up with mysqldump you have 2 possibilities:You dump into a file and then load the data into the Slave with the mysql client utility.You...
View ArticleLast login of MySQL database users
Taxonomy upgrade extras: userlogin triggerlogon triggerloggingaudithosterhostingMySQL hosting providers can easily loose the overview over their customers and which user or schema is still in use and...
View ArticleShrinking InnoDB system tablespace file ibdata1 PoC
Taxonomy upgrade extras: innodbIn this weeks MySQL workshop we were discussing, beside other things, about the innodb_file_per_table parameter and its advantages of enabling it. In addition there was a...
View ArticlePrivileges of MySQL backup user for mysqldump
Taxonomy upgrade extras: Backup Restore RecoveryBackupSome MySQL customers do not want to use the root user for mysqldump backups. For this user you have to grant the following minimal MySQL...
View ArticleBootstrapping Galera Cluster the new way
Taxonomy upgrade extras: galeraclusterA while ago it was pretty inconvenient to start a complete Galera Cluster from scratch. Rolling restart an such things are already working well but bootstrapping...
View ArticleBlock MySQL traffic for maintenance windows
From time to time some maintenance work on the MySQL database has to be done. During the maintenance window we do not want to have application traffic on the database.Sometimes it is hard to shut down...
View ArticleSwitching from MySQL/MyISAM to Galera Cluster
Taxonomy upgrade extras: galeramyisaminnodbstorage engineSwitching from MySQL/MyISAM to Galera Cluster requires that all tables (except those from the mysql, information_schema and performance_schema)...
View ArticleWe need you: MySQL DBA for FromDual Support line
FromDual is looking for professional, enthusiastic and experienced people who:Know MySQL, Percona Server or MariaDB extensivelyAre Familiar with the open source eco-systemKnow how to operate database...
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Unbreakable MySQL Cluster with Galera and Linux Virtual Server (LVS)
Taxonomy upgrade extras: galeraclusterMySQL Clusterload balancerlvsipvsHigh AvailabilityRecently we had to set-up a 3-node Galera Cluster with a Load Balancer in front of it. Because Galera Cluster...
View ArticleMySQL and Secure Linux (SELinux)
Maybe you experienced some strange behaviour with MySQL: Everything is installed correctly and should work. But it does not.Symptoms we have seen:MySQL starts/stops properly when started/stopped with...
View ArticleTo UNION or not to UNION...
Recently a forum question [ 1 ] got my attention: Is there any performance issue with Union? I used union all sometime back and it was performance issue just to make an opinion that we should used...
View ArticleGalera Cluster for MySQL and hardware load balancer
Our bigger customers where we help to deploy Galera Cluster for MySQL set-ups have some commercial hardware (e.g. F5 or Cisco) for load balancing instead of software load balancers.For those hardware...
View ArticleGalera Arbitrator (garbd)
Taxonomy upgrade extras: galeraarbitratorgarbdstartstopIt took me quite a while to find out how the beast Galera Arbitrator (garbd) works. To safe your time here a short summary:How to start Galera...
View ArticleHuge amount of TIME_WAIT connections
In MySQL we have the typical behaviour that we open and close connections very often and rapidly. So we have very short-living connections to the server. This can lead in extreme cases to the situation...
View ArticleMurphy’s Law is also valid for Galera Cluster for MySQL
We had a Galera Cluster support case recently. The customer was drenched in tears because his Galera Cluster did not work any more and he could not make it work any more.Upsss! What has happened?A bit...
View ArticleGalera Cluster 3.1 GA is out!
Great News: Galera Cluster v3.1 GA for MySQL 5.6 was released at Percona Live London (PLUK) 2013. The information is still a bit hidden...You can find it here:The Plug-in:...
View ArticleImpact of column types on MySQL JOIN performance
Taxonomy upgrade extras: sqlquerytuningmysqlIn our MySQL trainings and consulting engagements we tell our customers always to use the smallest possible data type to get better query performance....
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MySQL single query performance - the truth!
Taxonomy upgrade extras: mysqlperformancePerformance Tuningqueryquery tuningtuningMySQL single query performance - the truth!As suggested by morgo I did a little test for the same query and the same...
View ArticleBackup Manager for MySQL, MariaDB and Percona Server (mysql_bman)
Taxonomy upgrade extras: mysqlBackupRestoreRecoverymysql_bmanpitrAboutThe MySQL Backup Manager (mysql_bman) is a wrapper script for standard MySQL backup tools. The Problem with MySQL backup tools is,...
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Replication channel fail-over with Galera Cluster for MySQL
Taxonomy upgrade extras: channelgaleraclusterfail-overreplicationmasterslaveSometimes it could be desirable to replicate from a Galera Cluster to a single MySQL slave or to an other Galera Cluster....
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