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PS_history 2.0 was released last week with MySQL 8 support and bundled sys_history

PS_history is a tool which collects historical snapshots of the PERFORMANCE_SCHEMA (P_S). This allows you to trend P_S values over time, for example, it is possible to look at the 95 th percentile response time for a query over time.

PS_history is stored procedure and event based, and thus it resides entirely inside of the database with no external dependencies. It uses a clever technique to capture all of the P_S data in one consistent snapshot. This ensures that all of the sys_history views (bundled now with PS_history) have a consistent set of data.

By default, as long as the event_schedule is enabled, PS_history will collect data every 30 seconds. If a snapshot takes 30 seconds, there will be a 30 second delay before the next snapshot starts. This value can be changed by calling the `ps_history`.`set_collection_interval`(N) where N is the number of seconds between samples.

The `sys_history` schema is …

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MySQL Support People - Those Who Were There First

I'd like to devote this long weekend post, the first in a new series, to my current and former colleagues who once worked or still work in a company that provided public MySQL Support service and had a job role of MySQL Support engineer. The list of companies include MySQL AB/Inc ("good old MySQL"), Sun, Oracle, Percona, MariaDB, FromDual, maybe more (I named only those that surely provided or provides MySQL Support for customers outside of the company).

This is not the first time that I write about "people of MySQL", in a wider sense "those who contribute to MySQL Community". Last time it was about …

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Ghosts of MySQL Past: Part 3

See Part 1 and Part 2.

We rejoin our story with a lawsuit. While MySQL suing Progress NuSphere is not perhaps the first GPL lawsuit that comes to mind, it was the first time that the GPL was tested in court. Basically, the GEMINI storage engine was a proprietary storage engine bundled with a copy of MySQL. Guess what? The GPL was found to be valid and GEMINI was eventually GPLed, and it didn’t really go anywhere after that. Why? Probably some business reasons and also, InnoDB was actually rather good and there wasn’t a lawsuit to enforce the GPL there, making business relationships remarkably easier.

In 2003 there was a second round of VC funding. The development team increased …

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Past, Present and future of MySQL and variants Part 1: Ghosts of MySQL Past

You can watch the video of my 2014 talk here:

But let’s talk about things in blog form rather than video form :)

Back in 1979, there was UNIREG. A text UI to records (rows) in a database (err, table). The reason I mention UNIREG is that it had FoRMs which as you may have guessed by my capitalization there is where the FRM file comes from.

In 1986, UNIREG came to UNIX. That’s right kids, the 80×24 VT100 interface to ISAM (Index Sequential Access Method – basically rows are written in insert order and indexes point to them) came to UNIX. There was no generic query language, just FoRMs and reports. In fact, to this day, that …

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Planet MySQL has a long history …

MySQL has a long history since its birth 18 years ago when Monty Widenius and David Axmark started it. Planet MySQL started in 2004 and all its history is archived.  Let us dig in it. It is always good to look back at the past to get some lessons for the future. Here are the [...]

eulogy for mysql forge

When the mysql librarian closed, I didn’t think too much about it; it was a feature I probably never used. However this month brings the end of the mysql forge. The MySQL Forge was something I worked on while I was at MySQL so I am a little sad to see it go. 

Now for a little bit of a history lesson. We wanted some kind of “forge” back in 2005, because sourceforge was all the rage then (today, you can’t even find mariadb or mongodb listed there). We didn’t want to pay the exorbitant fees associated with sourceforge, so we investigated …

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Tech Messages | 2011-01-08

A special extended edition of Tech Messages for 2011-01-07 through 2011-01-08:

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What was InnoDB+?

Yes, I said InnoDB+ with a plus sign at the end (also see the first comment here).

Please note that this blog post is only based on public information. It has absolutely nothing in it that I only could have learned from back when I worked at Sun or MySQL AB. Everything has links or pointers to where you can find the information out on the Internet and all thoughts are based on stringing these things together.

There was a lot of talk around the acquisition of Sun Microsystems by Oracle about MySQL (MySQL AB was bought by Sun). Some of the talk centred around Oracle and their ability to make a closed source version of MySQL with added bits that wouldn’t …

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InnoDB Revision History

This is a brief overview of the history of InnoDB with respect to the Version Control Systems (VCS) that were used for developing. It could be useful to people who want to trace back in time to find the origins of bugs or features.

Early days
InnoDB was born in the mid 1990s when Heikki Tuuri started developing this masterpiece. Heikki was a lone developer at that time and he did not use any VCS. There is no InnoDB revision history before 2001.

2001 – 2005
Then in 2001 InnoDB was imported into MySQL’s BitKeeper repository and development continued, recording the history there.

2005 – 2010
Later on in Oct 2005 when Oracle acquired Innobase, InnoDB developers had to move away from MySQL’s BitKeeper repository and Subversion was chosen for InnoDB development. The latest sources from BitKeeper were imported into SVN without preserving the history …

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The Blog v.2.0

Long time ago, in 2002 I decided to create my own point of presence in the Internet. Back then I’ve got pretty nice domain (, hacked up a few pages on php, added a guestbook and that was it. Many years it was almost static and I did a few updates on my resume page few times a year. Later I’ve switched the site to wordpress to make it easier to manage my resume and stuff

And 3 years ago in March 2006 I’ve decided to start my own blog. I took a standard template and started the blog on a separate domain while the domain was on its own domain name… This spring my …

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