How many applications on a SQL database?

[zulufox]

My site is run on a php/SQL database with about 200 articles.

Now I'm adding a phpbb forum and product database.

Should I put each one of these applications on their own database, or should I just store all the data on one database.

[txbakers]

I would create separate databases for separate websites. That way you can create different passwords for each and limit exposure.

You only need one mySQL server installed.

[vrtlw]

I would create seperate databases for each application on a website, one SQL server, and in your case two databases. Makes it safer should table names conflict between apps.