Recently, I had to work on an emergency for a customer who was having a problem restarting a MariaDB Galera Cluster. After a failure in the cluster they decided to restart the cluster entirely following the right path: bootstrapping the first node, and then adding the rest of the members, one by one. Everything […]Read more
Since 5.7.12 MySQL includes what is called the X plugin, but also it includes X protocol and X DevApi. But what is all this and how does it work? Let me share a personal short story on how I found myself investigating this feature. In a previous post I wrote about the MySQL Router tool, […]Read more
Welcome to the third part of this series. I’m glad you’re still reading, as hopefully this means you find this subject interesting at least. Previously we presented the first two components of MySQL InnoDB Cluster: Group Replication and MySQL Router and now we will discuss the last component, MySQL Shell.
This is the last component […]
MySQL InnoDB Cluster is an Oracle High Availability solution that can be easily installed over MySQL to provide high availability with multi-master capabilities and automatic failover. In the previous post we presented the first component of InnoDB Cluster, group replication. Now we will go through the second component, MySQL Router. We will address MySQL Shell in a final […]Read more
Since MySQL 5.7 we have a new player in the field, MySQL InnoDB Cluster. This is an Oracle High Availability solution that can be easily installed over MySQL to get High Availability with multi-master capabilities and automatic failover.
This solution consists in 3 components: InnoDB Group Replication, MySQL Router and MySQL Shell, you can see […]
In this blog post, we’ll look at options for migrating database charsets to utf8mb4.
Migrating charsets, in my opinion, is one of the most tedious tasks in a DBA’s life. There are so many things involved that can screw up our data, making it work is always hard. Sometimes what seems like a trivial task […]
This blog post was motivated by an internal discussion about how to fully disable query cache in MySQL.
According to the manual, we should be able to disable “Query Cache” on the fly by changing
query_cache_type to 0, but as we will show this is not fully true. This blog will show you how to properly disable “query […]
During the last few weeks I’ve been testing and playing a bit with the new group-replication plugin available for MySQL 5.7. Before continuing I’d like to clarify some aspects: the plugin is only available in labs and is not yet ready for production. The current version is 0.6. I used 5.7.9 GA running in a Vagrant […]Read more
MySQL 5.7 comes with a new set of features and multi-source replication is one of them. In few words this means that one slave can replicate from different masters simultaneously.
During the last couple of months I’ve been playing a lot with this trying to analyze its potential in a real case that I’ve been […]
MySQL replication isn’t perfect and sometimes our data gets out of sync, either by a failure in replication or human intervention. We are all familiar with Percona Toolkit’s pt-table-checksum and pt-table-sync to help us check and fix data inconsistencies – but imagine the following scenario where we mix regular replication with the Tungsten Replicator:
We […]Read more