MySQL does, however, support the advanced feature of data partitioning within a database. PostgreSQL does not.
What is data partitioning? http://www.devx.com/dbzone/Article/20743/0/page/2 (PostgreSQL vs. MySQL vs. Commercial Databases)
see this presentation: http://jeremy.zawodny.com/mysql/mysql-scaling-pains/img0.html mainly this page: http://jeremy.zawodny.com/mysql/mysql-scaling-pains/img20.html
