Re: Equivalent praxis to CLUSTERED INDEX?
От | Bruce Momjian |
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Тема | Re: Equivalent praxis to CLUSTERED INDEX? |
Дата | |
Msg-id | 200408280354.i7S3slb21543@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: Equivalent praxis to CLUSTERED INDEX? (Gaetano Mendola <mendola@bigfoot.com>) |
Ответы |
Re: Equivalent praxis to CLUSTERED INDEX?
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Список | pgsql-performance |
Gaetano Mendola wrote: > | Right. My point was that non-full fill is valuable for us only when > | doing clustering, while for Oracle it is a win even in non-cluster cases > | because of the way they update in place. > > Don't you think this will permit also to avoid extra disk seek and cache > invalidation? If you are updating the row (0,1) I think is less expensive > put the new version in (0,2) instead of thousand line far from that point. It would, but does that outweigh the decreased I/O by having things more densely packed? I would think not. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073
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