Re: Fwd: Help required on query performance - Mailing list pgsql-sql

From Scott Marlowe
Subject Re: Fwd: Help required on query performance
Date
Msg-id dcc563d11001311713x55abc77bjfb1e13dc8397d469@mail.gmail.com
Whole thread Raw
In response to Re: Fwd: Help required on query performance  (Dave Clements <dclements89@gmail.com>)
Responses Re: Fwd: Help required on query performance  (Dave Clements <dclements89@gmail.com>)
List pgsql-sql
On Sun, Jan 31, 2010 at 6:09 PM, Dave Clements <dclements89@gmail.com> wrote:
> I did the re-analyze serveral times, using the command:
>
> ANALYZE tablename;
>
> Is there any other command as well or another way to do that?

It's important that the stats target get increased as well, it looks
like you're not getting enough buckets to get a good estimate of rows
to be returned for various conditions.

# show default_statistics_target ;default_statistics_target
---------------------------10

# alter database smarlowe set default_statistics_target=200;
ALTER DATABASE
# analyze;

Then run the explain analyze again and see if your row estimates are
closer and if the plan changes.


pgsql-sql by date:

Previous
From: Dave Clements
Date:
Subject: Re: Fwd: Help required on query performance
Next
From: Dave Clements
Date:
Subject: Re: Fwd: Help required on query performance