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MySQL and Memory: a love story (part 2)

We saw in the previous post that MySQL likes memory. We also saw how to perform operating system checks and some configuration changes for Swap and NUMA. Today, we will check what MySQL server can tell us about its memory usage. Introduced in MySQL 5.7 and enabled by default in MySQL 8.0, the Performance_Schema‘s Memory instrumentation allows us to have … Read More


MySQL and Memory: a love story (part 1)

As you may know, sometimes MySQL can be memory-hungry. Of course having data in memory is always better than disk… RAM is still much faster than any SSD disk. This is the reason why we recommended to have the working set as much as possible in memory (I assume you are using InnoDB of course). Also this why you don’t … Read More


sysbench for MySQL 8.0

Alexey made this amazing tool that the majority of MySQL DBAs are using, but if you use sysbench provided with your GNU/Linux distribution or its repository on packagecloud.io you won’t be able to use it with the new default authentication plugin in MySQL 8.0 (caching_sha2_password). This is because most of the sysbench binaries are compiled with the MySQL 5.7 client … Read More


MySQL: size of your tables – tricks and tips

Many of you already know how to retrieve the size of your dataset, schemas and tables in MySQL. To summarize, below are the different queries you can run: Dataset Size I the past I was using something like this : But now with sys schema being installed by default, I encourage you to use some of the formatting functions provided … Read More


MySQL InnoDB Cluster: upgrade from 8.0.11 to 8.0.12

In April, I already posted an article on how to upgrade safely your MySQL InnoDB Cluster, let’s review this procedure now that MySQL 8.0.12 is out. To upgrade all the members of a MySQL InnoDB Cluster (Group), you need to keep in mind the following points: upgrade all the nodes one by one always end by the Primary Master in … Read More


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