Galera on FromDual GmbH

Attribute promotion and demotion in the MariaDB Galera Cluster

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 28 Nov 2025 16:26:48 +0000

In MariaDB master/slave replication there is a feature called attribute promotion/demotion.

How does Galera Cluster behave with many nodes?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 24 Jan 2025 18:12:55 +0000

Recently I had the opportunity to have a lot of Linux systems (VMs with Rocky Linux 9) from one of our regular Galera Cluster trainings all to myself for a week. And MariaDB 11.4.4 with Galera Cluster was already installed on the machines.

MariaDB Galera Cluster with Corosync/Pacemaker VIP

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 17 Mar 2021 20:26:19 +0000

Sometimes customers want to have a very simple Galera Cluster set-up. They do not want to invest into machines and build up the know-how for load balancers in front of the Galera Cluster.

Keep your Galera Cluster up and running by all means

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 26 Feb 2021 12:15:14 +0000

We see quite often customers complaining that their Galera Cluster is not stable and “crashes” from time to time. As always one has to investigate before rating.

Galera Cluster Release Notes

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 19 Feb 2021 21:32:11 +0000

Source: Github: codership / documentation

Codership Blog for Galera Cluster with release announcements.

MariaDB Galera Cluster Upgrade Path

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 18 Dec 2020 10:47:51 +0000

Because we conduct many customers in MariaDB Galera Cluster upgrades and because these customers sometimes have pretty old MariaDB Galera Cluster set-ups I think it is good to have a rough MariaDB Galera Cluster Upgrade Path.

MySQL - MariaDB migration

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 07 Apr 2019 21:37:32 +0200

General findings
Migration from MySQL 5.x to MariaDB 5.5
Migration from MySQL 5.0 to MariaDB 10.3
Migration from MariaDB 10.0 to Percona Server 5.6
Migration from MySQL/Percona 5.6 to MariaDB 10.0
Migration from MySQL 5.7 to MariaDB 10.2
Migration from MySQL 5.7 to MariaDB 10.3
Migration from MySQL 5.7 to MariaDB 10.4
Migration from Percona XtraDB Cluster 5.5 to MariaDB Galera Cluster 10.4
Migration from MySQL 5.7 to MariaDB 10.5
Migration from MySQL 5.7 to MariaDB 10.6
Migration from MySQL 5.7 to MariaDB 10.6 on Windows
Migration from MySQL Galera Cluster 8.4 to Percona XtraDB Cluster 9.7

More and more MySQL users want to switch from MySQL/Percona Server to MariaDB over time or, more rarely, the other way around. This is mostly caused by the change of the default in the Linux Distributions (RHEL/CentOS 7, SLES 12, Debian 8) to MariaDB.
Up to MySQL/MariaDB 5.5 everything was quite easy, both Branches claim to be a drop-in replacement of each other. But after the separation into different forks (MariaDB 10.0 ff. vs. MySQL 5.6 ff.) we expect more and more problems migrating from one branch to the other what we call sidegrade.
Percona Server code is genetically closer to MySQL than MariaDB. So we expect to see less problems on this sidegrade.

Short term notice: Percona XtraDB Cluster training in English 7/8 February 2018 in Germany

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 19 Jan 2018 17:05:29 +0000

FromDual offers short term a Percona XtraDB Cluster and MySQL Galera Cluster training (2 days) in English.

MariaDB, Galera and MySQL training class schedule

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 29 Dec 2015 16:39:58 +0000

We offer our MySQL and MariaDB trainings together with well-respected training organizations: The Linuxhotel in Essen (Germany), the Heinlein Academy in Berlin (Germany) and GFU Cyrus AG in Cologne (Germany). Our own MySQL and MariaDB training classes are hold in the building of the HSO in Zürich (Switzerland).

Limitations of Galera Cluster

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 11 Jul 2015 17:07:40 +0000

If and how to use Galera Cluster for MySQL has been described already by many others…

Logging Galera Cluster conflicts

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 11 Apr 2015 12:30:54 +0000

We typically suggest our customers to use our MySQL/Galera Cluster my.cnf configuration template to avoid MySQL configuration and performance problems.

Galera Cluster last inactive check and VMware snapshots

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 11 Apr 2015 11:46:36 +0000

From time to time we see at Galera Cluster customer engagements the following, for me scary, warning in the MySQL error log:

failed MySQL DDL commands and Galera replication

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 09 Dec 2014 15:45:23 +0000

We have recently seen a case where the following command was executed on a Galera Cluster node:

Ugly way to install MySQL Galera Cluster 5.6 on Ubuntu 14.04

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 20 Oct 2014 21:26:22 +0000

I wanted to install MySQL Galera Cluster 5.6 on the new Ubuntu 14.04 with provided packages. It was a bit tricky to make it work.

FromDual: Tools for MySQL and Galera - Backup - Monitoring - Operations

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 27 Jul 2014 10:46:18 +0000

FromDual tools provide valuable additional functionality which facilitate and optimize daily operations of your MySQL databases. Since our last newsletter a lot of things have changed in the FromDual tools.

Replication channel failover with Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 19 Jun 2014 07:05:38 +0000

Sometimes it could be desirable to replicate from a Galera Cluster to a single MySQL slave or to an other Galera Cluster. Reasons for this measure could be:

Why FromDual customers are using Galera Cluster for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 20 Feb 2014 12:34:05 +0000

We are very satisfied with the functionality and the launch. The entire Cluster is running absolutely stable. This is a significant advantage for our customers because we are able to offer our services without interruption. We will use Galera in further projects and convert our existing Master/Slave installations.

What are the costs of one hour MySQL downtime?

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 17 Dec 2013 14:59:10 +0000

Hello,

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 for MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 11 Dec 2013 12:08:32 +0000

Features

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

Upgrade from Galera Cluster 2.x to 3.0

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 24 Oct 2013 21:25:22 +0000

Introduction

Codership announced from weeks ago introducing the Galera Cluster new release 3.0 having many bug fixes, performance enhancements plus the main purpose which is working with MySQL 5.6. In this article, I’ll go through the upgrade steps from Galera 2.x to the new release 3.0, but at the time of writing this article - as mentioned in the Codership release notes - THIS IS A BETA QUALITY RELEASE FOR TESTING PURPOSES. NOT RECOMMENDED FOR PRODUCTION YET.

Galera Load Balancer Documentation

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 17 Aug 2013 22:08:40 +0000

About

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)

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 17 Aug 2013 16:59:38 +0000

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)

oli.sennhauser@fromdual.com (Oli Sennhauser) — Thu, 13 Jun 2013 17:13:47 +0000

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.

Switching from MySQL/MyISAM to Galera Cluster

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 12 Mar 2013 08:23:36 +0000

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.

Bootstrapping Galera Cluster the new way

oli.sennhauser@fromdual.com (Oli Sennhauser) — Tue, 05 Feb 2013 19:18:25 +0000

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.

Galera Cluster Nagios Plugin

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 14 Sep 2012 10:49:59 +0000

Based on customer feedback we have decided to add a plugin Galera Cluster for MySQL to our MySQL Nagios/Icinga Plugins.

Galera Cluster discussions at FrOSCon 2012

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 27 Aug 2012 17:18:40 +0000

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

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 30 Jul 2012 15:11:17 +0000

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

FromDual Newsletter Spring 2012

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 27 Apr 2012 11:12:50 +0000

Dear MySQL User,

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

MySQL and Galera Load Balancer (GLB)

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sat, 07 Apr 2012 10:10:21 +0000

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 functionality. This is typically done with some kind of load balancing mechanism between the database and the application.

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

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 19 Feb 2012 09:56:45 +0000

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. Customers can deploy Galera Cluster locally in LAN environments, as geo-clusters over the WAN or as virtual cluster in the cloud.

I prefer MySQL binary tar balls with Galera...

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 08 Feb 2012 15:13:18 +0000

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.

Rolling upgrade of Galera 1.0 to 1.1

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 14 Dec 2011 15:38:27 +0000

A few days ago Codership announced their new version Galera v1.1 - synchronous Replication Cluster for MySQL. Before we look at the new feature of Rolling Online Schema Upgrade (OSU) we have a look at how to upgrade to the new Galera release.

Migrating from MySQL Master-Master Replication to Galera Multi-Master Replication

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 02 Dec 2011 14:48:58 +0000

Introduction

Galera is a synchronous Multi-Master Replication for MySQL. It is therefore in competition with several other MySQL architectures:

Building Galera Replication from Scratch

oli.sennhauser@fromdual.com (Oli Sennhauser) — Sun, 13 Nov 2011 12:29:54 +0000

Introduction

MySQL/Galera synchronous Multi-Master Replication consists of 2 parts:

The wsrep patches for MySQL (codership-mysql) and
the Galera Replication Plugin (galera).

If you do not want to download the prepared binaries you can build it on you own.
First you have to download the native MySQL sources, then patch it with the Galera wsrep patches and compile it. In a second step you have to build the Galera Plugin.

Galera - Synchronous Multi-Master Replication Cluster for MySQL/InnoDB

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 23 Sep 2011 11:07:03 +0000

Galera features

Galera provides the following features:

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 row level replication
Direct client connections
Drop-in replacement for native MySQL

Galera benefits

Benefits using Galera Replication:

MariaDB, Galera and MySQL Support

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 01 Dec 2010 12:26:19 +0100

FromDual is a support partner of MariaDB Corp. and Oracle Corp.. This gives us the opportunity to offer you customized enterprise support subscriptions for your mission-critical MariaDB, Galera or MySQL databases for all three vendors.

Limitations of MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 15 Mar 2010 11:01:40 +0000

Often asked but informations are spread around: The limitations of MySQL.

Presentations

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 26 Feb 2010 21:29:43 +0100

The following presentations are available:

Date	Title	Location	Lang
September 2026	PostgreSQL Daten retten (PDF, 952 kib)	LinuxDay 2026, 26 September 2026, HTL Dornbirn, Austria	Ger
November 2025	MySQL Honeypot (PDF, 324 kib)	DOAG 2025 Konferenz + Ausstellung, 18 - 20 November 2025, Nürnberg, Germany	Ger
November 2024	MySQL Performance Tuning (PDF, 791 kib), Was ist neu in MySQL 8.4? (PDF, 407 kib)	DOAG 2024 Konferenz + Ausstellung, 19 - 21 November 2024, Nürnberg, Germany	Ger
August 2024	Was ist neu in MariaDB 11.4? (PDF, 271 kib)	FrOSCon 2024, 17 and 18 August 2024, St. Augustin, Germany	Ger
November 2023	Das relationale Open Source Datenbank Ökosystem - IT strategische Gedanken (PDF, 496.4 kib)	DOAG 2023 Konferenz + Ausstellung: 22 November 2023, Nürnberg, Germany	Ger
November 2023	MariaDB und MySQL HA Lösungen - Ein Datenbank-Quartett im Hochverfügbarkeitsvergleich (PDF, 30.2 kib)	DOAG 2023 Konferenz + Ausstellung: 21 November 2023, Nürnberg, Germany	Ger
November 2023	Upgrade MySQL 5.7 Galera Cluster auf MySQL 8.0 (PDF, 132.7 kib)	Galera Webinar, 17 November 2023, Webinar, DACH	Ger
May 2023	Galera Cluster for MySQL and Master/Slave Replication (PDF, 300.1 kib)	Datenbank-Tage 2023, 24 and 25 May 2023, virtual in Frankfurt, Germany	Ger
May 2023	MariaDB - aber sicher! (PDF, 1.1 Mib)	Secure Linux Administration Converence (SLAC) 2023, 23 to 25 May 2023, Berlin, Germany	Ger
September 2022	Galera Cluster for MySQL and Master/Slave Replication (PDF, 223 kib), MySQL Point-in-Time-Recovery (PiTR) (PDF, 154 kib)	DOAG 2022 Konferenz + Ausstellung, 20 to 23 September 2022, Nürnberg, Germany	Ger
March 2022	MariaDB Galera Cluster and M/S replication (PDF, 352 kib)	Chemnitzer Linux-Tage, 12 and 13 March 2022, virtual in Chemnitz, Germany	Ger
February 2022	MariaDB Connection ID (PDF, 301 kib), MariaDB Galera Cluster and M/S replication (PDF, 239 kib), MariaDB Point-in-Time-Recovery (PDF, 168 kib)	FOSDEM 2022, 5/6 February 2022, virtual in Brussels, Belgium	Eng
November 2021	MySQL Security (PDF, 266 kib)	DOAG 2021 Conference and Expo, 16 - 18 November 2021, virtual in Nuremberg, Germany	Ger
February 2021	Mariabackup - too rarely used (PDF, 226 kib)	FOSDEM 2021, MariaDB devroom, 6/7 February 2021, Brussels, remote, Belgium	Eng
December 2020	MariaDB and MySQL for Web Developers (PDF, 623 kib), Examples	Web Developer Congress 2020, 18 - 20 December 2020, remote, DACH	Ger
November 2020	MariaDB / MySQL Stolperfallen - und wie komme ich da wieder raus? (PDF, 695 kib)	DOAG Konferenz und Expo, 19 November 2020, remote in Nürnberg, Germany	Ger
October 2020	MariaDB / MySQL Stolperfallen und wie komme ich da wieder raus? (PDF, 768 kib)	GNU/LinuxDay in Vorarlberg, 10 October 2020, Dornbirn (remote), Austria	Ger
March 2020	Migration Workshop PXC 5.5 to MariaDB 10.4 (PDF, 445 kib)	Customer Event, March 2020, Paris, France	Eng
December 2019	MariaDB 10.4 New Features (PDF, 443 kib)	IT-Tage 2019, 9 - 12 December 2019, Frankfurt, Germany	Ger
November 2019	MariaDB 10.4 New Features (PDF, 399 kib)	DOAG K + A 2019, 19 - 21 November 2019, Nürnberg, Germany	Ger
November 2018	MySQL 8.0 New Features (PDF, 393 kib), MariaDB 10.3 - MySQL with PL/SQL (PDF, 518 kib)	DOAG K + A 2018, 20 - 22 November 2018, Nürnberg, Germany	Ger
May 2018	MariaDB 10.2 - New Features (PDF, 1.6 Mib)	SLAC 2018, 7 - 9 May 2018, Berlin, Germany	Ger
March 2018	MariaDB 10.2 - New Features (PDF, 683 kib)	Chemnitzer Linux-Tage 2018, 11 March 2018, Chemnitz, Germany	Ger
November 2017	MySQL Query Tuning (PDF, 2.2 Mib), MySQL Replication and GTID (PDF, 293 kib), Wenn rwx für ugo zu ungenau ist - SELinux und AppArmor (PDF, 291 kib)	DOAG K + A 2017, 21 - 23 November 2017, Nürnberg, Germany	Ger
August 2017	Wenn rwx für ugo zu ungenau ist - SELinux und AppArmor (PDF, 303 kib)	FrOSCon 2017, 19 - 20 August 2017, St.Augustin, Germany	Ger
July 2017	Wenn rwx für ugo zu ungenau ist - SELinux und AppArmor (PDF, 280 kib)	Admin-Runde, 6 July 2017, Berlin, Germany	Ger
March 2017	Katastrophenschutz durch Backup - auch privat (PDF, 1.1 Mib), Wenn rwx für ugo zu ungenau ist - SELinux und AppArmor (PDF, 265 kib)	Chemnitzer Linux-Tage 2017, 11 + 12 March 2017, Chemnitz, Germany	Ger
December 2016	MySQL/MariaDB für nicht-MySQL DBAs (PDF, 491 kib)	IT-Tage 2016, 15 December 2016, Frankfurt, Germany	Ger
November 2016	MySQL Security für Oracle DBAs (PDF, 480 kib), MySQL HA vs HA (PDF, 358 kib), Einführung in das Tuning von MySQL (PDF, 421 kib), MySQL 5.7: JSON und GIS (PDF, 1.9 Mib)	DOAG K + A 2016, 15 -17 November 2016, Nürnberg, Germany	Ger
September 2016	MySQL Database Scalability (PDF, 300 kib)	Nextcloud Conference 2016, 16 - 22 September 2016, Berlin, Germany	Eng
August 2016	ClickHouse Column Store (PDF, 943 kib), Vergleich von Replikation und Galera Cluster (PDF, 633 kib), MySQL-Auswahl auch gegen die Distribution (PDF, 407 kib), Der DB-Backup ist gemacht - was nun? (PDF, 419 kib), MySQL 5.7, JSON und GIS (PDF, 1.3 Mib), MySQL 5.7: Migration und Sicherheit (PDF, 1.6 Mib)	FrOSCON 2016, 20 - 21 August 2016, St. Augustin, Germany	Ger
July 2016	MySQL 5.7 New Features (PDF, 980 kib)	DOAG Webinar, 8 July 2016, Webinar	Ger
June 2016	MySQL für Oracle DBAs (PDF, 3.35 Mib), MySQL Beispiele aus der Praxis - Wie setzen Kunden MySQL ein? (PDF, 3.3 Mib)	SOUG DAY 2016, 23 June 2016, Baden-Dättwil, Switzerland	Ger
June 2016	Sicherheitsrelevante Änderungen (und einige andere) in MySQL 5.7 (PDF, 289 kib)	SLAC 2016, 15 - 17 June 2016, Berlin, Germany	Ger
May 2016	MySQL für Oracle DBAs (PDF, 991 kib)	DOAG 2016 Datenbank, 10 May 2016, Düsseldorf, Germany	Ger
April 2016	MySQL Servers Working as a Team - Replication or Galera Cluster (PDF, 631 kib)	Open Source Data Center Conference (OSDC), 27 April 2016, Berlin, Germany	Eng
March 2016	RPM-Konventionen - ein moderner Turm von Babel (PDF, 384 kib)	Chemnitzer Linux-Tage 2016, 20 March 2016, Chemnitz, Germany	Ger
March 2016	MySQL 5.7 New Features (PDF, 990 kib)	CeBIT 2016, 14 March 2016, Hannover, Germany	Ger
January 2016	PERFORMANCE_SCHEMA and sys schema - What can we do with it? (PDF, 406 kib)	FOSDEM 2016, 29/30 January 2016, Brussels, Belgium	Eng
January 2016	MySQL für Oracle DBA’s (PDF, 1.7 Mib), MySQL Backup/Recovery (PDF, 348 kib)	DOAG Regionaltreffen Freiburg/Südbaden, 26 January 2016, Freiburg, Germany	Ger
January 2016	MySQL-Server im Teamwork - Replikation und Cluster (PDF, 631 kib)	Admin-Runde, 7 January 2016, Berlin, Germany	Ger
December 2015	MySQL Beispiele aus der Praxis - Wie setzen Kunden MySQL ein? (PDF, 3.3 Mib)	DOAG Regionaltreffen Nürnberg/Franken, 17 December 2015, Nürnberg, Germany	Ger
November 2015	MySQL Performance Tuningfür Oracle-DBA’s (PDF, 680 kib), Der Datenbank-Backup ist gemacht - was nun ? (PDF, 415 kib), MySQL-Server im Teamwork - Replikation und Cluster (PDF, 456 kib), Weltweite Produktionsdatenverwaltung mit MySQL-Replikation (PDF, 625 kib)	DOAG Conference 2015, 17 - 19 November 2015, Nürnberg, Germany	Ger
September 2015	MySQL-Server im Teamwork (PDF, 395 kib), MySQL Replikation und Galera Cluster im Überblick	DOAG Regionaltreffen München, 28 September 2015, Munich, Germany	Ger
June 2015	Der Datenbank-Backup ist gemacht - was nun? (PDF, 743 kib), Recovery testen und dann als Produktiv-Kopie nutzen, MySQL sicher aufsetzen und betreiben (PDF, 863 kib)	SLAC 2015, 24 - 26 June 2015, Berlin, Germany	Ger
April 2015	MySQL für Oracle DBA’s (PDF, 890 kib)	DOAG Regionaltreffen Stuttgart, 1 April 2015, Stuttgart, Germany	Ger
March 2015	MySQL Performance Tuning für Entwickler (PDF, 961 kib)	Chemnitzer Linux-Tage 2015, 21/22 March 2015, Chemnitz, Germany	Ger
March 2015	MySQL für Oracle DBA’s (PDF, 1006 kib)	SOUG GV 2015 + SIG, 19 March 2015, Baden-Dättwil, Switzerland	Ger
March 2015	MySQL Performance Tuning für Entwickler (PDF, 755 kib)	CeBIT 2015, 16 March 2015, Hannover, Germany	Ger
January 2015	MySQL Replikation - Die Eier legende Wollmilchsau? (PDF, 1.2 Mib)	DOAG Webinar, 9 January 2015, Webinar	Ger
November 2014	Konsolidieren von MySQL Landschaften (PDF, 438.0 kib), Backup und Point-in-Time-Recovery mit MySQL (PDF, 183.8 kib)	DOAG Conference 2014, 18 - 20 November 2014, Nürnberg, Germany	Ger
November 2014	GTID Replication Implementation and Troubleshooting (PDF, 175.6 Mib)	Percona Live London 2014, November 3-4, 2014, London, UK.	Eng
September 2014	High-availability with Galera Cluster for MySQL (PDF, 277 kib), Reading MySQL fingerprints (PDF, 161 kib), What is a Backup Good For? (PDF, 51 kib) & How to implement GTID Replication? (PDF, 99 kib)	FromDual Company Meeting 2014, September 10 - 12, Barcelona, Spain/Catalonia	Eng
May 2014	MySQL always-up with Galera (PDF, 438 kib)	SLAC 2014, May 14 2014, Berlin, Germany	Ger
May 2014	High-availability with Galera Cluster for MySQL (PDF, 313 kib)	LinuxTag 2014, May 10 2014, Berlin, Germany	Ger
March 2014	Need for Speed: MySQL Indexing (PDF, 1.1 Mib)	CeBIT 2014, March 11 2014, Hannover, Germany	Ger
November 2013	MySQL Backup (PDF, 315 kib), MySQL Cluster with Galera (PDF, 297 kib)	DOAG Conference 2013, November 10-12 2013, Nürnberg, Germany	Ger
November 2013	Need for Speed: MySQL Indexing (PDF, 977 kib)	Percona Live London 2013, November 11-12, 2013, London, UK	Eng
October 2013	Simple usage of Xtrabackup tool (PDF, 107.8 kib), Galera Cluster for MySQL (PDF, 325 kib)	FromDual annual company Meeting, October 9, 2013, Leoforos Vravronos, Greece	Eng
June 2013	MySQL for Oracle DBAs (PDF, 331 kib)	MySQL für Oracle DBAs, June 14 2013, Online	Ger
June 2013	MySQL HA and Security (PDF, 719 kib)	SLAC 2013, June 5 to 7 2013, Berlin, Germany	Ger
May 2013	MySQL Security (PDF, 295 kib), MySQL High-Availability (PDF, 244 kib)	DOAG 2013 Datenbank, May 14 2013, Düsseldorf, Germany	Ger
March 2013	MySQL Performance Tuning (PDF, 633 kib)	Frankfurter Datenbanktage 2013, March 13 to 15 2013, Oberems-Glashütten, Germany	Ger
February 2012	Synchronous multi-Master Replication for MySQL (PDF, 134 kib), MySQL Replication: New Features in 5.5 and 5.6 (PDF, 490 kib)	DOAG SIG MySQL, February 27 2013, Munich, Germany	Ger
November 2012	Data Warehouse (DWH) with MySQL (PDF, 1.3 Mib), MySQL New Features 5.6 (PDF, 474 kib), MySQL Replication (PDF, 451 kib)	DOAG Conference 2012, November 20-22 2012, Nürnberg, Germany	Ger
August 2012	We build a Data Warehouse with MySQL (PDF, 1.3 Mib)	FrOSCon 2012, August 25-26 2012, St. Augustin, Germany	Ger
March 2012	MySQL Configuration - the most important parameters (PDF, 727 kib), Indexing with MySQL (PDF, 520 kib)	DOAG SIG MySQL - Performance, March 13 2012, Wiesbaden, Germany	Ger
February 2012	New Features in MySQL 5.6 (PDF, 459 kib), MySQL synchronous replication in practice with Galera (PDF, 176 kib)	FOSDEM 2012 at MySQL and Friends Devroom, February 5 2012, Brussels, Belgium	Eng
December 2011	HandlerSocket und ähnliche Architekturen, NoSQL für MySQL (PDF, 524 kib)	Internet Briefing Developer Conference 2011, December 8 2011, Zürich, Switzerland	Ger
December 2011	MySQL Architectures for Oracle DBA’s (PDF, 700 kib), Practical MySQL Tuning (PDF, 796 kib)	UK Oracle User Group (UKOUG) Conference 2011, December 5-7 2011, Birmingham, UK	Eng
November 2011	MySQL Performance Tuning (PDF, 811 kib), MySQL Replication for Beginners (PDF, 503 kib)	DOAG Conference 2011, November 15 - 17 2011, Nürnberg, Germany	Ger
October 2011	Various MySQL High Availability (HA) Solutions (PDF, 234 kib)	Percona Live MySQL Conference, October 24 - 25 2011, London, UK	Eng
August 2011	MySQL Performance Tuning (PDF, 693 kib), MySQL Replication for Beginners (PDF, 380 kib)	FrOSCon 2011, August 20-21 2011, St. Augustin, Germany	Ger
June 2011	DB-Programming in a different way: HandlerSocket and similar Technologies - NoSQL for MySQL (PDF, 448 kib)	DOAG SIG Development, June, 9^th 2011, Kassel, Germany	Ger
May 2011	HA Architectures with MySQL (PDF, 228 kib)	DOAG SIG Database MySQL, May, 19^th 2011, Hanover, Germany	Ger
April 2011	HandlerSocket und ähnliche Architekturen, NoSQL für MySQL (PDF, 897 kib)	Grazer Linuxtage 2011 April 9^th 2011, Graz, Austria	Ger
March 2011	MySQL Replication - Scale-Out, Master-Master, Backup (PDF, 381 kib)	DOAG Regionaltreffen München March 23^rd 2011, Munich, Germany	Ger
February 2011	HandlerSocket and similar architectures - NoSQL for MySQL (PDF, 880 kib)	FOSDEM 2011, Brussels, Belgium	Eng
November 2010	MySQL Architectures for Oracle DBA’s (PDF, 479 kib)	DOAG Conference 2010, Nürnberg, Germany	Ger
August 2010	MySQL Performance Monitoring with Zabbix (PDF, 2.1 Mib)	OpenSQL Camp EU 2010 / FrOSCon, St. Augustin, Germany	Ger
March 2010	MySQL, where are you going? (PDF, 171 kib)	OpenExpo, Bern, Switzerland	Eng
March 2010	Performance Tuning & Scale-Out mit MySQL (PDF, 339 kib)	Internet Briefing, Zürich, Switzerland	Ger
September 2007	MySQL High-Availability and Scale-Out architectures (PDF, 547 kib)	/ch/open Workshop-Tage, Zürich, Switzerland	Eng
September 2007	MySQL Performance Tuning (PDF, 834 kib)	/ch/open Workshop-Tage, Zürich, Switzerland	Eng
August 2007	Locality of (P)reference (PDF, 467 kib)	MySQL PS EMEA Meeting, Budapest, Hungary	Eng

If you want us to have a talk at your conference or event please let us know.

MariaDB, Galera, MySQL and PostgreSQL Services

oli.sennhauser@fromdual.com (Oli Sennhauser) — Wed, 04 Nov 2009 22:59:07 +0100

Neutral and vendor independent
MariaDB, Galera Cluster, MySQL, Percona Server and PostgreSQL
Consulting and Services!

Percona releases Galera Cluster Version 9.7

oli.sennhauser@fromdual.com (Oli Sennhauser) — Mon, 14 Sep 2026 11:33:00 +0200

Finally, some good news again!

What has happened so far

After MariaDB Corp. acquired Codership OY—and with it, Galera Cluster for MySQL—in May 2025 [ 1 ], then announced the discontinuation of support for Galera Cluster for MySQL 8.4 at the end of September 2026 [ 2 ], and subsequently stated that it would no longer support Galera Cluster (for MariaDB!) in the Community Edition [ 3 ], there was a loud outcry from the community. MariaDB Corp. then made a partial retreat (“We’ve thoroughly considered your feedback and decided that now is not the time for a major change,”). A clear commitment to continued support for Galera Cluster in the Community Edition sounds different.

Systemd related stuff for MariaDB and MySQL

oli.sennhauser@fromdual.com (Oli Sennhauser) — Fri, 06 Jan 2023 19:05:06 +0100

Systemd Notizen

Systemd paged per default nach less. Das ist ungewohnt und doof, weil es gegen allgemeines Linux-Verhalten verstösst. Abhilfe schafft:

Galera on FromDual GmbH

Attribute promotion and demotion in the MariaDB Galera Cluster

How does Galera Cluster behave with many nodes?

MariaDB Galera Cluster with Corosync/Pacemaker VIP

Keep your Galera Cluster up and running by all means

Galera Cluster Release Notes

MariaDB Galera Cluster Upgrade Path

MySQL - MariaDB migration

Table of Contents

Short term notice: Percona XtraDB Cluster training in English 7/8 February 2018 in Germany

MariaDB, Galera and MySQL training class schedule

Limitations of Galera Cluster

Logging Galera Cluster conflicts

Galera Cluster last inactive check and VMware snapshots

failed MySQL DDL commands and Galera replication

Ugly way to install MySQL Galera Cluster 5.6 on Ubuntu 14.04

FromDual: Tools for MySQL and Galera - Backup - Monitoring - Operations

Replication channel failover with Galera Cluster for MySQL

Why FromDual customers are using Galera Cluster for MySQL

What are the costs of one hour MySQL downtime?

Galera Cluster for MySQL

Features

Upgrade from Galera Cluster 2.x to 3.0

Table of Contents

Introduction

Galera Load Balancer Documentation

About

Galera Arbitrator (garbd)

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

Switching from MySQL/MyISAM to Galera Cluster

Bootstrapping Galera Cluster the new way

Galera Cluster Nagios Plugin

Galera Cluster discussions at FrOSCon 2012

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

FromDual Newsletter Spring 2012

MySQL and Galera Load Balancer (GLB)

Table of Contents

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

I prefer MySQL binary tar balls with Galera...

Rolling upgrade of Galera 1.0 to 1.1

Migrating from MySQL Master-Master Replication to Galera Multi-Master Replication

Introduction

Building Galera Replication from Scratch

Introduction

Galera - Synchronous Multi-Master Replication Cluster for MySQL/InnoDB

Galera features

Galera benefits

MariaDB, Galera and MySQL Support

Limitations of MySQL

Presentations

MariaDB, Galera, MySQL and PostgreSQL Services

Percona releases Galera Cluster Version 9.7

What has happened so far

Systemd related stuff for MariaDB and MySQL

Table of Contents

Systemd Notizen