From: Rajesh Kumar Mallah <mallah@trade-india.com>
Organization: Infocom Network Limited
To: Stephan Szabo <sszabo@megazone23.bigpanda.com>
Subject: Re: planner question..
Date: Thu, 17 Apr 2003 20:42:16 +0530
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References: <20030417071102.V87131-100000@megazone23.bigpanda.com>
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On Thursday 17 Apr 2003 7:42 pm, Stephan Szabo wrote:
> On Thu, 17 Apr 2003, Rajesh Kumar Mallah wrote:
> > I think there shud be more documentation on
> > understanding EXPLAIN (ANALYZE) output.
> > once i found an webpage but lost it.
>
> I believe there's one inside the docs on performance or optimization.

I have seen that and saw a better one somewhere else which i
cant recall.


> > where do u see its expecting 5000 not 100000?
> >
> > > > | Aggregate  (cost=23982.58..23982.58 rows=1 width=0) (actual
> > > > | time=22872.97..22872.97 rows=1 loops=1)                          |
> > > > | -> Seq Scan on profile_master  (cost=0.00..23970.40 rows=4871
> > > > | width=0) (actual time=328.44..22730.69 rows=102090 loops=1) |
>
> In the Seq Scan line, it's got rows=4871.  That's the number it thinks are
> going to match the filter/index condition.

Thanks for spotting , i will go thru the docs once again though :)

regds
mallah.

-- 
Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

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