Server Databases Clash

Here's an excerpt from a database comparison between Oracle, DB2, MySQL, 
SQLserver, and Sybase.  (I just asked the author why postgres wasn't used.)

MySQL's great performance was due mostly to our use of an in-memory query 
results cache that is new in MySQL 4.0.1. When we tested without this cache, 
MySQL's performance fell by two-thirds.

Anyway, this confirms an earlier message suggesting that for web servers that 
have relatively constant queries, query caching can be a Big Deal.

<http://www.eweek.com/article/0,3658,s=708&a=23115,00.asp>