Re: Show lossy heap block info in EXPLAIN ANALYZE for bitmap heap scan
От | Robert Haas |
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Тема | Re: Show lossy heap block info in EXPLAIN ANALYZE for bitmap heap scan |
Дата | |
Msg-id | CA+TgmoZp_jb0cNN0d9UCcJD+nM6YH2s7v9MD1ri8gf6Km8o53w@mail.gmail.com обсуждение исходный текст |
Ответ на | Show lossy heap block info in EXPLAIN ANALYZE for bitmap heap scan ("Etsuro Fujita" <fujita.etsuro@lab.ntt.co.jp>) |
Список | pgsql-hackers |
On Thu, Jan 9, 2014 at 10:57 PM, Etsuro Fujita <fujita.etsuro@lab.ntt.co.jp> wrote: > I wrote: >> Robert Haas wrote: >> > Hmm, fair point. But I'm still not convinced that we really need to >> > add extra accounting for this. What's wrong with just reporting the >> > number of exact and lossy pages? > >> No. I intended to show the desired memory space for a TIDBitmap rather >> than the peak memory usage for that TIDBitmap. And I thought it'd be > better >> for the latter to be displayed as additional information. However, I've >> removed the functionality for showing the desired memory space due to >> technical problems. Now I should probably remove the functionality for >> showing the peak memory usage too. > >> Yes, as Andres mentioned, showing the peak memory usage is not a bad idea, >> I think. But I start to think it's not necessarily worth complicating the >> code ... > >> If there are no objections of others, I'll remove extra accounting for >> showing the peak memory usage. > > Done. Please find attached a patch. Looks good to me, so committed. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
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