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Isn't that how WP scaling works, though? It creates static pages.

Not by default and especially not once you start adding any sort of add-ons. A typical wordpress site will hit your MySQL database a TON.

I'm not familiar with wordpress but does it require that you use mysql?

Yep.

This isn't really accurate. WordPress supports overriding the database class. Here's an example of a plugin that supposts Postgres http://wordpress.org/extend/plugins/postgresql-for-wordpress...