One db vs Two with Mysql and PHP

[Anon]

I'm wondering if anyone can shed some light on a general question I have.

Is there any additional server strain by having a PHP script access 2 different db's to create its html.

If you use the mysql_select_db() does it create one session to mySQL or multiple?

Aside from organizational issues, what are the possible drawbacks? More difficult maintenence and backup, etc.

Thanks in advance. Joe

[[deleted]]

There is no real extra strain other than the database-switching.
And that is not even neccesary, in mysql you can run a query on multiple databases.

SELECT * FROM database.table;