Keep robots away from site at least two weeks

[zoth]

Hello,

I have to do some database maintance/test and I would like to keep away spider ROBOTS for my site at least two weeks.

Is this appropriate for use?

User-agent: *
Disallow: /

If I put the above code into my robots.txt, will the search engines drop my indexed pages?

Or just simple will not crawl, until I change it back again?

Thanks you answers!