This is a recap of the preFOSDEM MySQL Belgian Days 2025

This is a follow-up for MySQL GTID tags and binlog events, but you don’t need to read that first.

One of the recent innovations in MySQL was the addition of Tagged GTID’s. These tagged GTID’s take the format of <uuid>:<tag>:<transaction_id>.

And this change means that the GTID_LOG_EVENT’s in the binary logs needed to be changed. The MySQL team at Oracle decided to not change the existing format, but introduce a new event: GTID_TAGGED_LOG_EVENT.

Initially I assumed that decoding the new event would me mostly identical to the original event, but with just a single field added. But this isn’t the case as Oracle MySQL deciced to use a new serialization format (Yes, more innovation) and use it for this new event. The new serialization format is documented …

Introduction

Query Attributes are a relatively new feature of the MySQL Protocol. This is availble since MySQL 8.0.23.

Before Query Attributes were introduced there already was already another similar feature: Connetion Attributes, which provides per-connection metadata in the form of key/value pairs.

This is what connection attributes look like:

mysql> SELECT ATTR_NAME, ATTR_VALUE
    -> FROM performance_schema.session_connect_attrs
    -> WHERE PROCESSLIST_ID=64;

As we know, Orchestrator is a MySQL high availability and replication management tool that aids in managing farms of MySQL servers. In this blog post, we discuss how to make the Orchestrator (which manages MySQL) itself fault-tolerant and highly available. When considering HA for the Orchestrator one of the popular choices will be using the Raft consensus. […]

As many of you already know, MySQL is turning 30 this year! The official date is May 23. During the entire calendar year, we will celebrate this milestone all around the globe. We started in Belgium with the first event of the year: preFOSDEM MySQL Belgian Days. Take a look at this incredible journey that […]

We are happy to invite you to the MySQL User Group meetups and also to a special MySQL 30th Anniversary Celebration events which are being organized all over the world. Please stay tuned, more celebration events will come soon! Planned Meetups:   We look forward to seeing you! Meetups that have already taken place:   […]

This blog post summarizes how MySQL supports government IT priorities, from cybersecurity protection to modernization, cost savings, and workforce transformation.

You know about MySQL; we know about MySQL. After all, it’s been the most popular database system for years now. And now that we have that out of the way, on to the more important stuff! Because MySQL is so popular, you might be considering migrating your database to MySQL Community Edition or MySQL Enterprise. […]

In recent years, governments worldwide have accelerated their digital transformation efforts to improve public services, enhance accessibility, and streamline service delivery. From digital identity systems to healthcare, pensions, and tax collection, the push for modernization has become a top priority. However, this transformation comes with significant challenges, including cybersecurity threats, outdated legacy systems, a skills […]

Introduction If your application uses MySQL and you’re interested in getting the best out of it via performance tuning and monitoring, then Releem is a very nice tool that can assist you in your endeavor. I discovered Releem from Roman Agabekov’s posts on social media. Roman is the founder of this tool, and since his posts about MySQL performance tuning are very insightful, I decided to give it a try and see what it has to offer. Installing Releem Releem uses a client-server architecture. The server aggregates data received from the client... Read More

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