Krikor wrote: It does actually, like other CMSs it will play nicely with other db's (like SQLServer) but MySQLi is recommended.

Since Joomla! is an application driven CMS, unlike WP or Drupal which are node-based CMSs, you rely heavily on 3rd party extensions so you need to use the recommended database.

I guess that's what caused the confusion. Both Drupal and Joomla support PostgreSQL databases - it's listed in the specs. However, with Drupal the modules/extensions evidently did not see the database directly as the worked with either database when I used them. All you did was install them. Since Joomal! listed PosgreSQL as a supported database and being new to it I assumed you could just use based on my Drupal experience. Now I know different and I'll have to keep that in mind. It's part of the learning curve.

Thanks for the help.

You 're welcome :)

Fwiw, I am not a db expert but, If your project is a large one and you have the budget for it, I remember excellent results in a large scale Joomla!/K2 project with Percona.