Category: MySQL
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Open Database Alliance = Awesome
The big news coming from the MySQL Community today is that Monty Widenius and Percona have founded the Open Database Alliance, a group focused on “unifing all MySQL-related development and services, providing a solution to the fragmentation and uncertainty facing the communities, businesses and technical experts involved with MySQL”. I, for one, am 100% behind this.…
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Don’t Forget to Alter your Federated Tables!
If you’re using the Federated engine, here’s something important to remember (apart from the usual advice of “please don’t”). If you need to change the structure of the remote table, always remember to update the Federated table. If not, when you try to use the table, you’ll get this error: mysql> SELECT * FROM foo;…
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MySQL is People!
I went skydiving yesterday. Here’s a short video of me voluntarily leaving an airborne and perfectly sound aeroplane: What does this have to do with MySQL? Well, over the past few weeks there have been a bunch of conspiracy theories bouncing around. There are various topics, but the two favourite at the moment happen to…
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MySQL Workbench: My Impressions
I’ve been using the MySQL Workbench 5.1 beta for the past few days now, and I’m wondering how I designed databases without it. Okay, so that’s a pretty strong statement, but I’m genuinely happy with it. 5.1 has fixed my main problem with 5.0, in that the EER diagram mode was horribly slow to render,…
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Extracting a Database From a mysqldump File
Restoring a single database from a full dump is pretty easy, using the mysql command line client’s –one-database option: mysql> mysql -u root -p –one-database db_to_restore < fulldump.sql But what if you don’t want to restore the database, you just want to extract it out of the dump file? Well, that happens to be easy…
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Don’t put a NULL in the IN clause in 5.1
There seems to be an optimizer problem in 5.1, if you put a NULL in the IN clause of a SELECT. For example, given the following table: CREATE TABLE foo ( a INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (a) ); Compare these two EXPLAINs: mysql> EXPLAIN * FROM foo WHERE a IN (160000, 160001, 160002)\G…