[LUAU] MySQL and other SQL Engines

[Michael Bishop]

http://jcole.us/blog/archives/2008/04/14/just-announced-mysql-to-launch-new-features-only-in-mysql-enterprise/
http://www.mysqlperformanceblog.com/2008/04/15/partially-opensourced/

Regarding Sun's latest experiment: MySQL. I'm not so sure they are 
trying to learn from MySQL as much as trying to push the limit of how 
much money they can make off of open source without enraging the users.

What do you think?

Either way, it's the push I need to check out alternatives:

http://www.postgresql.org/
http://www.firebirdsql.org/
http://www.sqlite.org/

At PyCon it seemed to me that PostgreSQL was the choice of many core 
project developers. With outstanding DB toolkits like SQLAlchemy. It 
should be fairly painless to move to other SQL engines with proper planning.

Any suggestions for good resources about PostgreSQL performance tuning 
and best practices?

Michael