From: Stephan Szabo <sszabo@megazone23.bigpanda.com>
To: Rajesh Kumar Mallah <mallah@trade-india.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: planner question..
Date: Thu, 17 Apr 2003 07:12:37 -0700 (PDT)
Message-ID: <20030417071102.V87131-100000@megazone23.bigpanda.com> (raw)
In-Reply-To: <200304171927.08124.mallah@trade-india.com>
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.
>
> 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.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: sszabo@megazone23.bigpanda.com, mallah@trade-india.com
Subject: Re: planner question..
In-Reply-To: <20030417071102.V87131-100000@megazone23.bigpanda.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox