This week's book giveaway is in the Testing forum. We're giving away four copies of The Way of the Web Tester: A Beginner's Guide to Automating Tests and have Jonathan Rasmusson on-line! See this thread for details.
I'm guessing number on is probably database dependent and number two certainly is. Have a look at your database documentation, there will probably be somethign in there about maximum statement size. One thing is for sure though, if you are going anywhere near a maximum you can pretty much guarentee you are doing something wrong.