Re: planner question..

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.