Postgres Pro
Downloads
Home   >   mailing lists

Re: Optimizing Bitmap Heap Scan. - Mailing list pgsql-performance

From Lennin Caro
Subject Re: Optimizing Bitmap Heap Scan.
Date
Msg-id 89433.74453.qm@web59514.mail.ac4.yahoo.com
Whole thread Raw
In response to Re: Optimizing Bitmap Heap Scan.  (niraj patel <npatel@gridsolv.com>)
Responses Re: Optimizing Bitmap Heap Scan.  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
Re: Optimizing Bitmap Heap Scan.  (Robert Haas <robertmhaas@gmail.com>)
List pgsql-performance
Tree view
From: niraj patel <npatel@gridsolv.com>
Subject: Re: [PERFORM] Optimizing Bitmap Heap Scan.
To: "Grzegorz Jaśkiewicz" <gryzman@gmail.com>
Cc: pgsql-performance@postgresql.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@gmail.com>
To: niraj patel <npatel@gridsolv.com>
Cc: pgsql-performance@postgresql.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;


pgsql-performance by date:

Previous
From: Jonathan Foy
Date:
Subject: Vacuum running out of memory
Next
From: Robert Haas
Date:
Subject: Re: error occured in dbt2 against with postgresql