Re: GLOBAL vs LOCAL temp tables
От | Kevin Brown |
---|---|
Тема | Re: GLOBAL vs LOCAL temp tables |
Дата | |
Msg-id | 20030417211544.GI1833@filer обсуждение исходный текст |
Ответ на | Re: GLOBAL vs LOCAL temp tables (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-hackers |
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
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