B+tree discussions

[Robert Collins]

On Thu, 2008-07-03 at 11:15 -0500, John Arbash Meinel wrote:


> I'm counting about 204 bytes per row, and we know that we get ~90 rows
> into a page. Or 18K per page unpacked in memory.
> 
> So the 1000 node cache is actually an 18MB memory cache.

in two-tuple indices, we should have very high locality of reference for
the first element of the tuple (file ids should often be the same for an
entire page, for both keys and references).

That would allow saving some memory.

-Rob


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