Steve Jones - Editor (12/23/2009)
Lots of adds and deletes can do it. Our AV program would add in 10k+ every time, and I think it trimmed out values older than a week once a day. So we could see the identity value jump by over 10mm a week, but we'd only have about that many rows in the table at any time. So despite getting to 1B over months, we'd still see 10mm rows in the table (roughly)
That sounds like a good argument for using a GUID instead of an identity.
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