Re: Optimizing Bitmap Heap Scan.

From: niraj patel <npatel(at)gridsolv(dot)com>
Subject: Re: [PERFORM] Optimizing Bitmap Heap Scan.
To: "Grzegorz Jaśkiewicz" <gryzman(at)gmail(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Date: Tuesday, December 8, 2009, 1:50 PM

Hi gryzman,

I have run vacuum full analyze on the cmrules tables. The version of pstgres is 8.2.13. How should I change stats to 100 ?

Thanks
From: Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>
To: niraj patel <npatel(at)gridsolv(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Sent: Tue, 8 December, 2009 7:12:49 PM
Subject:
Re: [PERFORM] Optimizing Bitmap Heap Scan.

it looks like it might choose wrong plan, cos it gets the stats wrong.
Try increasing number of stats to 100.
Btw, what version it is ?

in psql
mydb=# set default_statistics_target = 100;