Commonly used in combination with wordPHP for websites.
MySQL is the fastest free open source database when you are NOT using transactions (using myisam engine) (which is why it is so great for blogs). But when you are using transactions (using innodb engine) (which any enterprise application must always use) it is VERY slow.
A properly optimized query written by a master or that you spent days writing might be fastest in Oracle, but in all other cases, PostgreSQL beats both Oracle and MySQL (innodb).
"MySQL's lack of time zone support is such a pain in the ass."
"MySQL is still running crash recovery, since 2 weeks ago (due to a known bug.... uh 'feature request' according to their developers, where it uses a primitive and ultra slow bubble sort to sort the transactions) . I wonder if my business will ever be up and running again."