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Re:SQLite improves performance with memory-mapped I/O by techtalsky on Thursday May 23, 2013 @03:38PM (#5759015)
I think WordPress just tries to cut complexity by using MySQL only so it doesn't have to deal with support for arbitrary RDBMS's.
Re:SQLite improves performance with memory-mapped I/O by TazeTSchnitzel on Thursday May 23, 2013 @07:32PM (#5760251)
More likely, the code is poorly written and heavily reliant on MySQL.
Re:SQLite improves performance with memory-mapped I/O by jacques_chester on Thursday May 23, 2013 @09:04PM (#5760622)
This is more or less the correct answer for Wordpress-the-ecosystem.

Wordpress-the-base-install has a thin abstraction layer over the database in the $wpdb object.

But plugins and themes can, and regularly do, use PHP's MySQL functions to access and manipulate the DB directly.