Re: [GENERAL] Benchmarks
От | Bruce Momjian |
---|---|
Тема | Re: [GENERAL] Benchmarks |
Дата | |
Msg-id | 200001061814.NAA15845@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [GENERAL] Benchmarks (Dustin Sallings <dustin@spy.net>) |
Ответы |
Re: [GENERAL] Benchmarks (Vacuum)
|
Список | pgsql-general |
> Untrue, vacuum is *extremely* important for updating statistics. > If you have a lot of data in a table, and you have never vacuumed, you > might as well not have any indices. It'd be nice if you could seperate > the stat update from the storage reclaim. Actually, it'd be nice if you > could reuse storage, so that an actual vacuum wouldn't be necessary unless > you just wanted to free up disk space you might end up using again anyway. > > The vacuum also doesn't seem to be very efficient. In one of my > databases, a vacuum could take in excess of 24 hours, while I've written a > small SQL script that does a select rename and a insert into select from > that will do the same job in about ten minutes. This is a database that > cannot lock for more than a few minutes. This is serious. Why would an INSERT / RENAME be so much faster. Are we that bad with VACUUM? -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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