Tips and tricks for writing SQL in different DB servers.
Put this somewhere in your ~/bin:
watch ‘echo “show processlist” | mysql -u whateveruser –password=mypassword | grep -v “show processlist” ‘
Now run it and you will have a poor man’s monitor, kind of like top but for MySQL. That coupled with screen (or multiple terminals) may give you some quick and easy piece of mind.
Every once in a while you will get a query that no matter what you try, it doesn’t use the indices. This is typically because the cost-based optimizer decides that an approach that is slower has a total cost that is lower than using the index and making it faster. To solve this, you would […]
In order to make queries run faster, you should try to have oracle explain to you how the query should be performed. The whole explanation for oracle tuning can be found on the Oracle Tuning guide, but here are the basics.
This tip contains a couple of MySQL scripts that allow me to create and drop a database and a user that will “own” said database.