Tag: MySQL

Log Buffer #246, A Carnival of the Vanities for DBAs

Administrators across the database technologies find themselves at the center stage of that and they are sharing tips and tricks regarding that in their blogs. This Log Buffer Edition touches that and much more in Log Buffer #246.

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Non-deterministic Functions and the Binary Log

I wrote this post because I ran across this issue when debugging why tables with triggers/functions that were not getting replicated to slaves. The problem appears when binlog_format is set up  as STATEMENT. You can check the ‘change log’ checking…

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Log Buffer #245, A Carnival of the Vanities for DBAs

Getting stuck on technical problems is a norm in the life of any IT professional and DBAs are no exception. With evolving databases and their streaming new features make it more challenging. Blogs often provide the Eureka moment for those problems. So sit back and enjoy this Log Buffer Edition, which is Log Buffer #245.

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Log Buffer #244, A Carnival of the Vanities for DBAs

Managing the databases of any kind of any size in the production environment requires the administrators to remain up to date and on the toes every time. They need to learn fast and apply their knowledge fast. Keeping abreast of the newer features and the troubleshooting techniques is must for them and this Log Buffer Edition helps easing that task. Enjoy the Log Buffer #244.

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Announcing PalominoDB’s Non Profit Program

I’ve always had a dream of being able to use what we are doing at PalominoDB not only for our for profit clients, but for those who go out day to day helping those who need it.  We always try…

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Log Buffer #243, A Carnival of the Vanities for DBAs

From Percona Live, London to TechEd Australia to Oracle Open World USA, the blogosphere of Oracle, MySQL, SQL Server and the related technologies is bustling with the eye witness accounts of these conferences, technical overviews, observations, predictions, and much more. This Log Buffer Edition covers all that and as usual more in Log Buffer #243.

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Log Buffer #242, A Carnival of the Vanities for DBAs

Whenever Oracle Open World ends, it not only leaves the technology professionals in awe and full of pride, it also makes them come up with new and great blogging ideras and this Log Buffer Edition covers that flowing notions from bloggers across the Oracle and MySQL beauties, in addition to SQL Server in Log Buffer #242.

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Exporting the mysql.slow_log table into slow query log format

Using pt-query-digest is an excellent way to perform a SQL review. However, sometimes you don’t have access to the slow_query_log_file. For example, when MySQL runs on Amazon RDS, the slow_query_log_file is unavailable (see the RDS FAQ). To get around this,…

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The Empty Error Log

The MySQL errorlog is an important point of reference when administering a MySQL Server. We can grasp much about the state of our MySQL instance by the informational and error messages written out to it by our MySQL daemon. I was asked to investigate some replication outage alerts a colleague had received overnight. One of the primary directions I took was the error log file. This is where I would expect find any evidence of replication being stopped or crashes etc. When I ran the command to tail the log I was shocked to see the log was totally empty.

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Important Caveats When Using pt-online-schema-change

Using pt-online-schema-change is a great way to change a table without downtime or switching over to a secondary database first. While using it on production systems, we found some interesting issues to consider. 1) There were foreign_keys referencing the table…

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