April 16, 2014

Speaking on RIT-2007, Moscow, Russia

I’ve been invited to speak at RIT-2007 which stands for “Russian Internet Technologies” conference. It takes place 16-17 April in Moscow, Russia. It looks like this is going to be biggest Russian conference on Internet technologies so far with many large Russian Internet projects sending their delegates. You can check out conference sessions schedule here. […]

MySQL Replication and Slow Queries

I just filed a bug regarding slow queries executed by replication thread are not being logged to the slow query log. This is not a big deal but it is ugly little gotcha which I think few people know about. It is especially bad if you’re using tools to analyze slow query log to find […]

Integers in PHP, running with scissors, and portability

Until recently I thought that currently popular scripting languages, which mostly evolved over last 10 years or something, must allow for easier portability across different platforms compared to ye good olde C/C++. After all, their development started a few decades after C, so its notorious caveats are all well-known and should be easy to avoid […]

PHP Sessions – Files vs Database Based

One may think changing PHP session handler from file based to database driven is fully transparent. In many cases it is, sometimes however it may cause some unexpected problems as happened to one of our customers. If you use file based sessions PHP will lock session file for whole script execution duration, which means all […]

Only Design What You Can Implement

Working with various projects using MySQL I observe a lot of problems are coming from very simple fact – product is designed containing features which developers do not know how to implement effectively. In many companies you would see “waterfall” like approach for web application development at least on business-development boundary. Business people would dream […]

Beware large Query_Cache sizes

During last couple of months I had number of consulting projects with MySQL Query Cache being source of serious problems. One would see queries both for MyISAM and Innodb tables mysteriously stalling for few seconds with “NULL” in State column. These could be troubleshooted to waiting on Query Cache which at the same time had […]

Onsite consulting in Sillicon Valley anyone ?

I’ve already wrote we do not generally do a lot of on-site onsite consulting, but as I’m anyway going to be speaking at MySQL Users Conference anyway it may be good time for some onsite jobs. In fact I have already scheduled visits on Friday, Monday and Tuesday following the conference but I can do […]

MySQL Releases first real Community Release

Few days ago MySQL released MySQL 5.0.37 which I would call first real Community Version, because unlike previous versions which were released from the same source tree as Enterprise MySQL this one has some community features added, which is great. Also over last half a year MySQL seems to have organized resources for Community Engineering […]

MySQL MyISAM Active Active Clustering – looking for trouble ?

Reading last few days worth of planet MySQL and commenting on some entries as you can see. The post by Oli catches my attention. There is also PDF with more details available Oli is saying you can use MySQL with Active Active Clustering and MyISAM tables if you follow certain rules like enabling external locking, […]

MySQL Query Cache and prepared statements – support comming ?

Looking at post by Konstantin Osipov we should finally get Query Cache working with prepared statements in MySQL 5.1 The interesting thing Konstantin notes it just took few days to fix it – I believe MySQL Support Team alone spent much more times explaining customers why is it not done or troubleshooting cases with wrong […]