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MySQL Feed

Oracle MySQL resources, news, and support articles.

How to diagnose errors in the MySQL error log

I frequently see questions about how to understand the nature of errors in MySQL’s error log. Now, there is a lot of complexity to this — the flowchart would be quite large, as with any nontrivial piece of software. But there is one particular class of errors that is relatively easy to diagnose, if you pay close attention to the error message.

Often an error has a little number in it, as in this example from our forums:

Shenandoah Ruby Users Group Monthly Meetup

I’ll be speaking at the Shenandoah Ruby Users Group Monthly Meetup tomorrow in Harrisonburg, Virginia. The topic is “Seven Things To Know About MySQL Performance.” See you there!

Community events around Percona Live MySQL Conference and Expo 2012

We’re very pleased with community support for Percona Live MySQL Conference and Expo. We’ve got wonderful speakers providing content of phenomenal session lineup for the conference this year. We have community helping by spreading the world, about conference, picking talks and all king of other
wonderful contributions.

Database Firewalls from Oracle and GreenSQL

If you are not part of 36 percent(1) of respondents have taken steps to ensure your applications are not subject to SQL injection attacks, it would be worth your time to look at the Oracle Database Firewall and the GreenSQL Database Firewall.

MySQL Cluster 7.2.5 available for download

The binary version for MySQL Cluster 7.2.5 has now been made available at (GPL version) or (comme

Speaking at RubyNation 2012

Wow, I completely forgot to advertise this. I’m speaking Saturday (tomorrow) at RubyNation, which is already well underway (I’m missing the first day, though).

Why You Need to Understand Your Working Set Size

I guest-posted on Fusion-io’s blog about the database’s working set size and the interplay with fast Flash storage. It’s written from a MySQL point of view, but it’s applicable to many types of systems.

How FLUSH TABLES WITH READ LOCK works with Innodb Tables

Many backup tools including Percona Xtrabackup, MyLVMBackup and others use FLUSH TABLES WITH READ LOCK to temporary make MySQL read only. In many cases the period for which server has to be made read only is very short, just few seconds, yet the impact of FLUSH TABLES WITH READ LOCK can be quite large because of the time it may take to complete this statement. Lets look at what the problem is.

Speaking at POSSCON

I’m speaking at POSSCON in Columbia,SC next week (March 28). My talk will be about Open Source software Percona Produces – Percona Server, Percona Xtrabackup, Percona Toolkit, Percona XtraDB Cluster. If you want to get a birds eye view about Open Source software Percona has created this is a great talk to attend.

Best kept MySQLDump Secret

Many people use mysqldump –single-transaction to get consistent backup for their Innodb tables without making database read only. In most cases it works, but did you know there are some cases when you can get table entirely missing from the backup if you use this technique ?

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