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What are the costs of one hour MySQL downtime?


there are companies which earn tens of thousands of Euros per hour with their MySQL databases. Other companies operate their ERP system on MySQL, to which 1000 employees are attached to. Is the database down 1000 people are not working any more until the system is working again! Downtime costs starting at EUR 30'000.- per hour upwards.


Galera Cluster Support

To ensure secure and reliable operations of your Galera Clusters for MySQL FromDual offers you, according to your requirements, 2 different support contracts.

The FromDual support team is tightly working together with the Galera developers and contributes a significant amount of the support fee to the Galera project!


Galera Cluster Support

Um den sicheren und zuverlässigen Betrieb Ihres Galera Clusters für MySQL zu gewährleisten bieten wir Ihnen entstprechend Ihren Anforderungen 3 verschiedene Möglichkeiten an Galera Support an.

Das FromDual Support-Team arbeitet eng mit den Galera-Entwicklern zusammen und steuert einen erheblichen Beitrag der Support-Einnahmen an das Galera Projekt bei!


Galera Cluster for MySQL


Galera is a synchronous multi-master replication Cluster for MySQL/InnoDB databases, having features like:

  • Synchronous replication
  • Active-active multi-master topology
  • Read and write to any cluster node
  • Automatic membership control, failed nodes drop from the cluster
  • Automatic node joining
  • True parallel replication, on row level
  • Direct client connections, native MySQL look & feel


The benefits of these features are:


Schulung: HA Cluster für MySQL mit Galera in Zürich 17./18. Oktober 2013

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Was für die Oracle Datenbank der Real Application Cluster (RAC) ist, ist für MySQL der Galera Cluster.

Nachdem der Galera-Cluster Workshop an den /ch/open Workshop-Tagen 2013 ein voller Erfolg war, haben Sie jetzt noch mal die Chance, sich bis Ende September (30. September) für den vollen 2-tägigen Galera-Cluster Kurs vom 17. und 18. Oktober in Zürich anzumelden.

Galera Load Balancer Documentation


glbd is a simple TCP connection balancer made with scalability and performance in mind. It was inspired by pen, but unlike pen its functionality is limited only to balancing generic TCP connections.



Galera Arbitrator (garbd)

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It took me quite a while to find out how the beast Galera Arbitrator (garbd) works. To safe your time here a short summary:

Unbreakable MySQL Cluster with Galera and Linux Virtual Server (LVS)

Recently we had to set-up a 3-node Galera Cluster with a Load Balancer in front of it. Because Galera Cluster nodes (mysqld) still reply to TCP requests on port 3306 when they are expelled from the Cluster it is not sufficient to just leave it to the Load Balancer to check the port if a Galera node is properly running or not.

Galera Cluster für MariaDB und MySQL Schulung

Sie setzten MariaDB oder MySQL bereits produktiv ein und haben höchste Anforderungen an die Datenbank-Verfügbarkeit? Wenn Sie diese mit Galera Cluster abdecken wollen, ist diese Schulung die Richtige für Sie.


Switching from MySQL/MyISAM to Galera Cluster

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Switching from MySQL/MyISAM to Galera Cluster requires that all tables (except those from the mysql, information_schema and performance_schema) are using the InnoDB Storage Engine.

For altering the Storage Engine of the tables we wrote a script ( long time ago already. Because we have made many of those switches recently we have extended its functionality.

Bootstrapping Galera Cluster the new way

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A 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 was a pain.

With Galera v2.2 new functionality came in. We tried it out and it did not work as documented. :-( Thanks to Teemu's help we found there was a documentation bug in the Galera documentation.

Artikel über MySQL im neuen iX

Hallo MySQL Gemeinde,

Im neuen iX (2012-10) hat es zwei nette Artikel über: MySQL HA-Lösungen (S. 116) und MySQL 5.6 (S. 66).

Viel Spass beim Lesen!

Galera Cluster Nagios Plugin

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Based 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 node is in status Primary and if the expected amount of Galera Cluster nodes is available. If not, a warning or an alarm is returned.

Galera Cluster Nagios Plugin

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Aufgrund einer Kundenrückmeldung haben wir uns entschlossen unsere MySQL Nagios/Icinga Plugins um ein Plugin Galera Cluster für MySQL zu erweitern.

Das Modul prüft, ob der Knoten im Status Primary und ob die erwartete Anzahl von Galera Cluster Knoten vorhanden ist. Wenn nicht, wird eine Warnung oder ein Alarm zurückgemeldet.

Galera Cluster discussions at FrOSCon 2012

During and after Henriks great talk about Galera Cluster at the FrOSCon 2012 in St. Augustin we found 2 important things related to Galera Cluster for MySQL:

DOAG SIG MySQL - Replication: September 4, 2012 in Hamburg

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On Tuesday, September 4, 2012 the next DOAG SIG MySQL meeting will take place in Hamburg (Germany) with the topic Replication.

Possible presentations are: MySQL Replication, Galera Cluster, Replication with Oracle GoldenGate, Replication with Zimory Scale and Tungsten Replicator.

The event will presumably be located at the Hotel Böttcherhof at Wöhlerstrasse 2.

FromDual Newsletter Frühling 2012

Sehr geehrte MySQL-Nutzerinnen und -Nutzer,

Mit diesem Newsletter bringen wir Sie auf den neuesten Stand was das Produkt MySQL und unsere Dienstleistungen betrifft.


FromDual Newsletter Spring 2012

Dear MySQL User,

With this newsletter we bring you up to date about MySQL and our Services.

If you are not interested in this newsletter or if you are the wrong recipient, you can unsubscribe here or even better send this newsletter to the right person.


FromDual Performance Monitor for MySQL (MPM) v0.9 released

On April 2nd 2012 FromDual released the new version v0.9 of its Performance Monitor for MySQL (mpm). The new version can be downloaded from here.

The Performance Monitor for MySQL (mpm) is an agent which is hooked into Zabbix. Zabbix is an integrated Enterprise Monitoring solution which can produce performance graphs and alerting.

The changes in the new release are:

Codership partners with FromDual to offer consulting and support services for Galera Cluster for MySQL

Helsinki, Finland, Uster, Switzerland – February 18, 2012 – Codership, the provider of Galera Cluster for MySQL, and FromDual, a MySQL consulting company, today announced collaboration to offer Galera Cluster technology and related support and consulting services for Galera users all over the world, especially in German speaking countries Germany, Austria and Switzerland (DACH). Galera Cluster is a synchronous, true multi-master replication cluster for MySQL using the well known InnoDB storage engine.

Codership und FromDual vereinbaren Zusammenarbeit bei Beratungs- und Support-Dienstleistungen für Galera Cluster auf MySQL

Helsinki, Finnland, Uster, Schweiz – 18. Februar 2012 – Codership, Anbieter des Galera Clusters für MySQL, und FromDual, eine MySQL Beratungsfirma, kündigen eine Zusammenarbeit bei der Verbreitung von Galera Cluster Technologie und dazugehörigen Support- und Beratungs-Dienstleistungen für Galera Anwender an. Galera Cluster ist ein synchroner, echter Multi-Master Replikations-Cluster für MySQL, welcher die weit verbreitete InnoDB Storage Engine nutzt.

I prefer MySQL binary tar balls with Galera...

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In 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 2.0) running in parallel at the same time.


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