On Mon, Nov 17, 2008 at 9:15 AM, Abah Joseph <[EMAIL PROTECTED]> wrote:
> The question came to my mind is, How did large website like Yahoo handle
> such data? Sure. Yahoo users may be more than 20 millions users or so.

Very large data sets are often partitioned in some way so that a given
lookup doesn't have to be performed against the entire data set.
That's quite an expansive topic in fact.

http://en.wikipedia.org/wiki/Partition_(database)

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