Sometimes, you want to backup individual databases in MySQL to move to a different server. This part is easy using mysqldump: shell> mysqldump -u root -p –databases db1 db2 … > backup.sql The problem is, what happens when you want to backup the permissions associated with these databases? Well, here are a few queries to […]
Author Archives: Gary
A Brief Introduction to MySQL Performance Tuning
Here are some common performance tuning concepts that I frequently run into. Please note that this really is only a basic introduction to performance tuning. For more in-depth tuning, it strongly depends on your systems, data and usage. Server Variables For tuning InnoDB performance, your primary variable is innodb_buffer_pool_size. This is the chunk of memory […]
Don’t Quote Your Numbers
It’s a fairly simple rule, and something that should be obeyed for your health and sanity. There are a couple of bugs which you could run into, when quoting large numbers. First of all, Bug #34384. This is concerning quoting large INTs in the WHERE condition of an UPDATE or DELETE. It seems that this […]
The \G modifier in the MySQL command line client
A little publicized, but exceedingly useful feature of the MySQL command line client is the \G modifier. It formats the query output nicely, so you can read through it easier. To use it, you just replace the semi-colon at the end of the query with ‘\G’. For example, checking the master status: mysql> SHOW MASTER […]
Our Valve Overlords
So, it seems that Valve Software are yet again trying to stop people from gaining new weapons in Team Fortress 2. The Scout update was released yesterday, and people want to try out the new weapons a quickly as possible. As per normal, the targets were those who used the Steam Achievement Manager. Dear Valve, […]