A couple of weeks ago, my colleague Marco Tusa published an important announcement titled “Do Not Upgrade to Any Version of MySQL After 8.0.37.” The announcement highlighted a critical issue in MySQL 8.0.38, MySQL 8.4.1, and MySQL 9.0.0 that caused database server crashes. Good news! The upcoming minor releases for the community edition of MySQL and...

pt-online-schema-change is an amazing tool for assisting in table modifications in cases where ONLINE ALTER is not an option. But if you have foreign keys, this could be an interesting and important read for you. Tables with foreign keys are always complicated, and they have to be handled with care. The use case I am […]

MySQL 9.0 is an Innovation Release, but as you may have read in my Quick Peek, I found little innovation. However, one new item caught my eye, and it could be a way to track query performance. MySQL 9.0 EXPLAIN enhancement Here is the syntax that will be referenced in the post. {EXPLAIN | DESCRIBE […]

In this blog post, we will show you how to add external exporters to Percona Monitoring and Management (PMM) and monitor various services. Our focus will be on Valkey/Redis, but the principles apply to other technologies as well. PMM uses VictoriaMetrics, which is compatible with Prometheus. Prometheus has numerous exporters that you can use.  When...

In this article, we will demonstrate how to have a single MySQL database user account that can connect from specific hosts. We would usually implement it by creating separate user accounts with the same username but different hosts/IPs like <USER>@<HOST1>, <USER>@<HOST2> …. <USER>@<HOSTn>. Then, give those users the...

In the previously posted blog, Compaction in Percona Server for MongoDB (PSMDB), we discussed how compact works before version 4.4. In this blog, we will see how compact works on PSMDB 6.0. I recommend reading the blog post linked above to understand what compact does, how to check dataSize, and how much space we can […]