| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Jussi Pakkanen <jpakkane(at)gmail(dot)com> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: BUG #4462: Adding COUNT to query causes massive slowdown |
| Date: | 2008-10-09 12:05:10 |
| Message-ID: | 48EDF376.80801@gmx.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs |
Jussi Pakkanen wrote:
> However when I try to count the amount of distinct codes, I get this:
>
>
> EXPLAIN SELECT COUNT(DISTINCT code) FROM log;
> QUERY PLAN
> ----------------------------------------------------------------------------
> -----
> Aggregate (cost=100801488.30..100801488.31 rows=1 width=10)
> -> Seq Scan on log (cost=100000000.00..100721245.24 rows=32097224
> width=10)
> (2 rows)
This looks like you have one of the enable_${plantype} parameters turned
off. 100000000 is the penalty that is added when a plantype if turned off.
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