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Re: Postgres 9.0 has a bias against indexes

From: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
To: Igor Neyman <ineyman(at)perceptron(dot)com>
Cc: Mladen Gogala <mladen(dot)gogala(at)vmsinfo(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Wilson <david(dot)t(dot)wilson(at)gmail(dot)com>, Kenneth Marshall <ktm(at)rice(dot)edu>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Postgres 9.0 has a bias against indexes
Date: 2011-01-27 21:33:17
Message-ID: AANLkTi=GrGRte=DGwQ=Z=F5wss-kL5vERT-WT9t3-AbS@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, Jan 27, 2011 at 2:32 PM, Igor Neyman <ineyman(at)perceptron(dot)com> wrote:
>> On Oracle?  Then how can it get the values it needs without
>> having to hit the data store?
>
> It doesn't.
> It does "INDEX UNIQUE SCAN" and then "TABLE ACCESS BY INDEX ROWID".

Ahhh, ok.  I thought Oracle used covering indexes by default.

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