Best Strategy for spiders with offline Database?

Web Server remains online but SQL "content supplier" is offline

[FrenchGuy]

I have a big dilema: we have to put our SQL Server offline for half a day or so. The web server remains online but will not be able to execute .asp pages which rest on our SQL server.

We wanted to redirect all traffic to a short message explaining we are offline for maintenance but I am affraid Googleboot will think that all our pages are now dupplicates...

Does anybody know which Error Code ist best for this situation? Which one will indicate the spiders there is nothing to eat that day but they are welcome back for the next meal?

[jatar_k]

I would say temporarily moved 302