Re: [HACKERS] mdnblocks is an amazing time sink in huge relations

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От Bruce Momjian
Тема Re: [HACKERS] mdnblocks is an amazing time sink in huge relations
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Msg-id 199910200357.XAA04714@candle.pha.pa.us
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Ответ на Re: [HACKERS] mdnblocks is an amazing time sink in huge relations  (Vadim Mikheev <vadim@krs.ru>)
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> I agreed that there is no way to get accurate estimation for
> # of rows to be seen by a query...
> Well, let's keep up-to-date # of rows present in relation:
> in any case a query will have to read them and this is what
> we need to estimate cost of simple scans, as for costs of
> joins - now way, currently(?) -:(
> 
> But please remember that there is another SCC goal -
> faster catalog access...

I want to index access more cache entries on cache miss for 7.0.

--  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,
Pennsylvania19026
 


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