Upgrading MySQL with minimal downtime through Replication

Problem With the release of MySQL 5.1, many DBAs are going to be scheduling downtime to upgrade their MySQL Server. As with all upgrades between major version numbers, it requires one of two upgrade paths: Dump/reload: The safest method of upgrading, but it takes out your server for quite some time, especially if you have […]

pento.net goes mobile!

With a bit of fiddling around, I’ve found a good combination of WordPress plugins for mobile support. For iPhone/iPod: WPtouch. Lots of options, looks good on the iPhone browser. For all other mobiles: WP-viewMobile. This one is particularly handy, because it gives you the option to define the user agent strings it should activate for. […]

Permissions by interface on the local server

I had an issue come up recently that involved some confusion over permissions for the same user, connecting through different interfaces. For example, say you have a server with the public IP address of You could connect to it from the local machine using the following commands: shell> mysql -h localhost # Connects through […]

Replication Checksumming Through Encryption

Problem A problem we occasionally see is Relay Log corruption, which is most frequently caused by network errors. At this point in time, the replication IO thread does not perform checksumming on incoming data (currently scheduled for MySQL 6.x). In the mean time, we have a relatively easy workaround: encrypt the replication connection. Because of […]