MySQL Vala Program Example
Taxonomy upgrade extras: englishmysqlexamplevalaprogramSummary: In this article we have a short look at a simple MySQL example program written in Vala.Recently a customer pointed me to a programming...
View ArticleBuilding Galera Replication from Scratch
Taxonomy upgrade extras: englishmulti masterreplicationclustergalerasynchronousIntroductionMySQL/Galera synchronous Multi-Master Replication consists of 2 parts:The wsrep patches for MySQL...
View ArticleHow MySQL behaves with many schemata, tables and partitions
Taxonomy upgrade extras: englishtableinnodbpartitionmyisamschematable_open_cachetable_cachetable_definition_cacheopen_files_limitopen_filesIntroductionRecently a customer claimed that his queries were...
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Migrating from MySQL Master-Master Replication to Galera Multi-Master...
Taxonomy upgrade extras: englishHigh Availabilitymysqlmulti masterreplicationMySQL ClusterhaRing-Replikationgaleramaster-mastermulti-masterschoonerIntroductionGalera is a synchronous Multi-Master...
View ArticleRolling upgrade of Galera 1.0 to 1.1
Taxonomy upgrade extras: englishupgradegalerarolling upgradeA few days ago Codership announced their new version Galera v1.1 - synchronous Replication Cluster for MySQL. Before we look at the new...
View ArticleRecover lost .frm files for InnoDB tables
Taxonomy upgrade extras: englishBackup Restore RecoveryBackupRecoveryinnodbfrminnodb table monitorRecently I found in a forum the following request for help:My MySQL instance crashed because of free...
View ArticleI prefer MySQL binary tar balls with Galera...
Taxonomy upgrade extras: installationtargalerabinaryIn my set-ups I have different MySQL versions (MySQL 5.0, 5.1, 5.5 and 5.6, Percona Server 13.1 and 24.0, MariaDB 5.2.10, 5.3.3, Galera 1.0, 1.1 and...
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What can MySQL performance monitoring graphs tell you?
Taxonomy upgrade extras: Performance Tuningperformanceenterprise monitormonitoringmonitorperformance monitoringperformance monitorgraphmpmmaasMany of you may monitor their databases for different...
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Does InnoDB data compression help with short disk space?
Taxonomy upgrade extras: innodbcompressBecause we are a bit short off disk space on one of our servers I had the idea to try out the MySQL feature Data Compression for InnoDB. This feature is useful if...
View ArticleTroubles with MySQL 5.5 on FreeBSD 9
Taxonomy upgrade extras: mysqltabletemporarytable_open_cachefreebsdFreeBSD 9 seems to have some troubles with MySQL 5.5.20. A customer has moved from MySQL 5.0 on Linux to MySQL 5.5 on FreeBSD 9. He...
View ArticleFromDual Performance Monitor for MySQL (MPM) v0.9 released
Taxonomy upgrade extras: performanceenterprise monitormonitoringperformance monitoringnewsperformance monitorreleasegraphgalerampmmaasOn April 2nd 2012 FromDual released the new version v0.9 of its...
View ArticleMySQL and Galera Load Balancer (GLB)
When you install a Galera Cluster for MySQL for High Availability (HA) it is not enough to install the Database Cluster to achieve this goal. You also have to make the application aware of this HA...
View ArticleHow to make the MySQL Performance Monitor work on Windows?
Taxonomy upgrade extras: performanceperformance monitoringperformance monitormpmmaaswindowsA customer recently was asking why our MySQL Performance Monitor (MPM) is not working on Windows...? The...
View ArticleMySQL @ FrOSCon 7 in St. Augustin (Germany)
Taxonomy upgrade extras: mysqltalkconferencefrosconAlso this year we will have a special track for MySQL, Galera, Percona und MariaDB at the FrOSCon in St. Augustin in Germany. The conference is...
View ArticleChange MyISAM tables to InnoDB and handle SELECT COUNT(*) situation
Taxonomy upgrade extras: innodbmaterialized viewsmaterialised viewsmyisamselectshadow tablecountIts a known problem that changing the Storage Engine from MyISAM to InnoDB can cause some problems [ 1 ]...
View ArticleDeadlocks, indexing and Primary Key's
Taxonomy upgrade extras: indexprimary keyinnodbtuningperformanceOptimizerRecently a customer has shown up with some deadlocks occurring frequently. They were of the following type (I have shortened the...
View ArticleGalera Cluster discussions at FrOSCon 2012
Taxonomy upgrade extras: galeraclusterMySQL Clusterchannelfail-overreplicationDuring and after Henriks great talk about Galera Cluster at the FrOSCon 2012 in St. Augustin we found 2 important things...
View ArticleGalera Cluster Nagios Plugin
Taxonomy upgrade extras: monitoringgalerapluginclusterBased on customer feedback we have decided to add a plugin Galera Cluster for MySQL to our MySQL Nagios/Icinga Plugins.The module checks, if the...
View ArticleMySQL tmpdir on RAM-disk
Taxonomy upgrade extras: temporarymemory tablemyisamMySQL temporary tables are created either in memory (as MEMORY tables) or on disk (as MyISAM tables). How many tables went to disk and how many...
View ArticleResize XFS file system for MySQL
Important: Before you start any operation mentioned below do a proper file system backup of your XFS file system you want to resize. If MySQL is running on this mount point do this with a stopped...
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