Re: [PORTS] vacuum takes too long
От | David Wetzel |
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Тема | Re: [PORTS] vacuum takes too long |
Дата | |
Msg-id | 199901062238.XAA03489@cat.turbocat.de обсуждение исходный текст |
Ответ на | Re: [PORTS] vacuum takes too long (Bruce Momjian <maillist@candle.pha.pa.us>) |
Ответы |
Re: [PORTS] vacuum takes too long
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Список | pgsql-hackers |
> From: Bruce Momjian <maillist@candle.pha.pa.us> > > insert a few row in a table (>50000) and do > > delete from mytable; > > vacuum verbose analyze; > > > > Why is this that slow? > > Analyze checks every column in every row. even if you only type "vacuum verbose" it takes _very_ long. I deleted _all_ records with "delete from mytable;" before. A drop and a new create is faster. But what is when you delete (maybe 100000) rows but keep 100 in the table? I use 6.4.2 on NetBSD/i486 (that box makes gets 12MBytes/sec via the filesystem out of the drives) --- _ _ _(_)(_)_ David Wetzel, Turbocat's Development, (_) __ (_) Buchhorster Strasse, D-16567 Muehlenbeck/Berlin, FRG, _/ \_ Fax +49 33056 82835 NeXTmail dave@turbocat.de (______) http://www.turbocat.de/ DEVELOPMENT * CONSULTING * ADMINISTRATION
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