Tom Lane wrote:
> Kevin Brown <kevin@sysexperts.com> writes:
> > But as Tom pointed out, if you delete a bunch of data from a table
> > then insert a fresh set of data, but don't end up inserting much data
> > with roughly the same keys that were in the original batch of data,
> > you'll get a lot of empty areas in your index that are unused. VACUUM
> > marks them as being available for reuse, of course, but that doesn't
> > help you unless you insert data containing values that are appropriate
> > to the unused areas.
>
> No, you misunderstood. That is the problem in existing releases --- but
> in CVS tip, VACUUM can actually remove unused sections from the b-tree
> and make that space available for re-use in other key ranges.
Ah, okay.
That's quite a feat, actually. 7.4 is going to be one sweet
release...
--
Kevin Brown kevin@sysexperts.com