With 2 gigs of physical memory and a ~1 gig commit charge, x64 XP's built in task manager reports that I have a system cache size of slightly over a gig. Ok, this makes sense, I suppose I've got a few ...

At 100 billion lookups/year, a server tied to Elasticache would spend more than 390 days of time in wasted cache time.

Clearing cache may something that a person will do for their computers and web browsers, with most having this feature available for the Android devices on their storage controls or recent apps.