>>10
Asking about the query optimizer and undocumented behavior just makes you sound like you overheard someone talking about sql once and picked up a couple of keywords. It also makes other people not really care about your thread.

On the other hand, being forthright and saying "I don't know what I'm doing", and also demonstrating that you are capable of using both a search engine and your brain, might get you somewhere.

I'm guessing based on your last comment that you're using some cheap/free web host, in which case my first suggestion would be to get a better host (perhaps set up your own server locally; you'll learn a lot that way). But again, you've supplied absolutely no information, so this is a total guess.