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MySQL Group Replication, Single-Primary or Multi-Primary, how to make the right decision ?

Today’s blog post is related again to MySQL Group Replication. By default MySQL Group Replication runs in Single-Primary mode. And it’s the best option and the option you should use. But sometimes it might happen that in very specific cases you would like to run you MGR Cluster in Multi-Primary mode: writing simultaneously on all the nodes member of the … Read More


MySQL Group Replication Limitations: savepoints

Today in our series of articles related to MySQL Group Replication’s limitations, let’s have a quick look at Savepoints. The manual is clear about this: Transaction savepoints are not supported. The first thing to check then is if the application that will use our MySQL Group Replication Cluster is currently using savepoints. We have two ways to find this, the … Read More


MySQL Group Replication and table design

Today’s article is about the first two restrictions in the requirements page of the manual: InnoDB Storage Engine: data must be stored in the InnoDB transactional storage engine. Primary Keys: every table that is to be replicated by the group must have an explicit primary key defined. So the first requirement is easy to check by a simple query that … Read More


How to migrate from Galera Cluster to MySQL Group Replication

In this article, I will show you how it’s possible to perform an online migration from a 3 members Galera cluster setup (in this case I’m using PXC 5.7.14) to a 3 members MySQL Group Replication cluster setup (MySQL Community 5.7.17). Don’t forget that before adopting Group Replication as database backend, you should validate that your application do match GR … Read More


Group Replication is GA with MySQL 5.7.17 – comparison with Galera

It’s a wonderful news, we have released MySQL 5.7.17 with Group Replication Plugin (GA quality). From the definition, Group Replication is a multi-master update everywhere replication plugin for MySQL with built-in conflict detection and resolution, automatic distributed recovery, and group membership. So we can indeed compare this solution with Galera from Codership which is a Replication Plugin implementing the WSREP … Read More


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