You might have noticed from my profile picture on this blog, as well as on Facebook, Twitter, etc., that I am a fan of Julian Cash‘s photography.

If you’re in the MySQL community, you almost certainly know his photography, both the “white background” style and “light painting” style. Julian took a bunch of photos of the MySQL community at conferences a few years ago, but the community has changed tremendously since then, and it’s time for a whole lot of new ones! I’ve asked Julian to come to the conference and take a bunch more photos of the MySQL community in his iconic “white background” style at the Percona Live MySQL Conference and Expo …

Did you see this when you are migrating from your lovely MySQL 5.1 to MySQL 5.5?
Oh, sorry, you remain attached to your pretty 4.1. Yes, I know, MyISAM has become so important in your life…

Ok, seriously, I would like to share this little observation I made recently when switching to MySQL 5.5 on one slave.
You can see below two graphs for the transactional activity, there is exactly the same volume of update, delete and insert queries :

MySQL 5.1

MySQL 5.5

But the gray area represents the number of commit per second.
I find that I have much more commit with MySQL 5.5, why? …

I’ll be on a whistle-stop tour of California next week, including two presentations at the Percona Live MySQL Conference and Expo.

On day one at 1:20pm I’ll be presenting CAP Theorem: Two out of three ain’t right, in which I will be challenging the popular ‘two out of three’ explanation of CAP Theorem, examining the evidence from a variety of experts, including Dr Eric Brewer.

Then on day three at 9:00am I’m very honoured to be providing a keynote presentation, The State of the MySQL Ecosystem.

Here’s an overview of the presentation:

It is now over three years since Oracle …

In the recent years a lot of emphasis has been put on the InnoDB storage engine. This is a great thing. This has turned InnoDB from a very limited transactional storage engine to a very powerful piece of the MySQL architecture. InnoDB is now scalable to many cores. It is also very resilient. It supports [...]

The Percona Live MySQL Conference and Expo begins next Monday and runs April 22-25, 2013. Attendees will see great keynotes from leaders in the industry including representatives from Oracle, Amazon Web Services, HP, Continuent, and Percona. They can also participate in thought provoking Birds of a Feather sessions on Tuesday night and the Wednesday night Community Networking Reception will be fun and entertaining with the presentation of the Community Awards and the Lightning Talks.

If you cannot attend the entire Percona Live MySQL Conference but want to take advantage of the keynotes, BOFs, and Community Networking …

In addition to the problem with trx_list scan we discussed in Friday’s post, there is another issue in InnoDB transaction processing that notably affects MySQL performance – for every transaction InnoDB creates a read view and allocates memory for this structure from heap. The problem is that the heap for that allocation is destroyed on each commit and thus the read view memory is reallocated on the next transaction.

There are two aspects of this problem:

1) memory allocation is an costly operation and if memory …

Some bugs can have a high impact if it causes data corruption, security issues or simply causes MySQL to crash. But what about small bugs and small usability issues?

This entry from the MySQL 5.6.8 release notes is an interesting one:
InnoDB: On startup, MySQL would not start if there was a mismatch between the value of the innodb_log_file_size configuration option and the actual size of the ib_logfile* files that make up the redo log. This behavior required manually removing the redo log files after changing the value of innodb_log_file_size. The fix causes MySQL to write all …

MySQL, the most popular open source database brings you great performance. You can see the performance details in http://dimitrik.free.fr/blog/. To help you get the most from MySQL's performance, take the MySQL for Performance Tuning course.

This four day instructor-led training course covers:

• Performance Tuning Basic
• Performance Tuning Tools
• MySQL Server Tuning
• MySQL Query Cache
• Storage Engines
• Schema Design and Performance
• Performance Tuning Extras

This course is available in three delivery types:

• Training-on-Demand: Take this course at your own …

This week, we explain the InnoDB and Memcached integration in MySQL 5.6. Ear Candy is about the nonexistent 2-step deadlock detection in MariaDB and At the Movies is Colin Charles talking about the features of MariaDB 10.

InnoDB and memcached in MySQL 5.6
memcached official page
InnoDB integration with memcached MySQL manual page
History of the term NoSQL
setting up the InnoDB memcached plugin in MySQL 5.6

read more

Some time ago I wrote a blog post describing a way I use to verify MySQL Server bugs. But my job consists not only of bugs which can be verified just by passing SQL queries to the server.

One of such examples is UDF bugs.

MySQL User Reference Manual is good source of information for those who want to write UDF functions, as well as book "MySQL 5.1 Plugin Development" by  Sergei Golubchik and Andrew Hutchings. But while the book describes in details how to write UDFs it was created in time when current MySQL version was 5.1 and does not contain information about how to build UDF nowadays. User Reference Manual has this information, …