Connect & Disconnetcting functions

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Wow what a lot of response in one night!
Thanks for that guys!

Now Richards Noah said something about caching results etc.
That really cought my attention:

on this website I have a menu which items are called from a DB, and i display
a path to where you are in the site which should be called from the DB.
But as i can imagine, caching results could really take some pressure
of the DB. Am i right? I've never worked with it yet...

Hope you guys can give me some extra info...

Thanks in advance.

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