Jepsen’s analysis of MySQL 8.0.34 walked through a set of concurrency and isolation anomalies in InnoDB. MariaDB, which inherits the same codebase, took the report seriously and shipped a response: a new server variable called innodb_snapshot_isolation, turned on by default start...

If you read today’s announcement, you know Percona has a lot to say about what’s broken in modern data infrastructure. Lock-in dressed up as openness. Costs that climb while control shrinks. Vendors who made “managed” mean giving up visibility instead of gaining it.

When we decided to stop being quiet about all of it, to build an iden...

Pipelining and transactions are two important features in Redis and Valkey. Both involve sending multiple commands together. But they solve completely different problems, make completely different guarantees, and combining them incorrectly is one of the most common sources of subtle bugs in production systems.

In this post we’ll unpack both from first principles, look...

My colleague Miguel wrote about ways to audit login attempts in MySQL over 13 years ago, and this is still a relevant subject. I decided to refresh this topic to include some important changes since then.

Very often, it is important to track login at...