Re: vacuum analyze again...
От | Bruce Momjian |
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Тема | Re: vacuum analyze again... |
Дата | |
Msg-id | 200102201532.KAA25347@candle.pha.pa.us обсуждение исходный текст |
Ответ на | vacuum analyze again... (Jean-Christophe Boggio <cat@thefreecat.org>) |
Ответы |
Re: vacuum analyze again...
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Список | pgsql-general |
[ Charset ISO-8859-1 unsupported, converting... ] > Hi, > > In Oracle, there are 2 ways to do the equivalent of vacuum analyze : > > * analyze table xx compute statitics > * analyze table xx estimate statistics > > In the second form, you can tell on what percentage of the file you > will do your stats. This is useful to make a quick analyze on huge tables > that have a homogenous dispersion. > > Is there a way to "estimate" the statistics that vacuum analyze will > use instead of "computing" them ? No, we have no ability to randomly pick rows to use for estimating statistics. Should we have this ability? -- Bruce Momjian | http://candle.pha.pa.us pgman@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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