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Mark McDowall
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  • Bioinformatician, present
My interests are photography, computing, jive and cycling.

Feel free to browse through my pictures or look at what I am reading.
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Percona Server 5.6.16-64.0 with TokuDB engine now available

Percona is glad to announce the alpha release of Percona Server 5.6.16-64.0 with TokuDB storage engine on March 3, 2014. Download it today!

Top MySQL DBA Interview Questions - for those hiring, and for those look...

Written by: Gerardo (Gerry) Narvaja @seattlegaucho I’m writing this blog as 2013 draws to an end. Like many people do at this time of year,

MySQL asynchronous queries to access XtraDB Cluster nodes in parallel

How to execute 5 MySQL asynchronous queries in parallel against 5 different nodes of Percona XtraDB Cluster using PHP with MySQLnd drivers.


The scientific resource for fission yeast

The power of MySQL's GROUP_CONCAT

Michael Rikmas explains when MySQL's GROUP_CONCAT is the most useful with several examples. He recommends it when you have aggregation of ma

Designing one to many relations - MongoDB vs MySQL

Stephane Combaudon reveals several topics that you will have to keep in mind when designing one to many relations in MongoDB. He also compar

Using the new spatial functions in MySQL 5.6 for geo-enabled applications

MySQL 5.6 implements an additional set of functions that can help create geo-enabled applications with MySQL. Alexander Rubin details some m

Science fiction starships, an extensive size comparison

A while back we saw a size comparison of random spaceships. That one pales in comparison to this extensive version by Dirk Loechel. It's got

InnoDB scalability issues due to tables without primary keys

Tables without primary keys cause a wide range of contention because they rely on acquiring dict_sys mutex to generate row-id values. Ovais

xkcd: Reverse Identity Theft

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High Availability MySQL: Concurrent connection create performance for My...

I used sysbench to measure the performance for concurrent clients connecting and then running a query. Each transaction in this case is one

InnoDB performance optimization basics (updated)

Muhammad Irfan revisits a post from Peter Zaitsev published back in 2007 titled "Innodb Performance Optimization Basics" and discusses what'

Flexbox layout isn't slow - HTML5Rocks Updates

A resource for developers looking to put HTML5 to use today, including information on specific features and when to use them in your apps.

xkcd: int(pi)

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Performance Matters

Web performance depends on much more than JavaScript optimization. Fortunately, the W3C's Web Performance Working Group has given rise to ne

xkcd: Shadowfacts

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PHD Comics: Taking work home

Link to Piled Higher and Deeper

The machine stops | ExtremeTech

It is never wise to invest too much time, energy, or faith into a single point of failure. You might have the fastest and most efficient car

Image Compression for Web Developers - HTML5 Rocks

Reduce your page size by looking under the hood of image compression.