Re: Optimizing Bitmap Heap Scan.

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От Lennin Caro
Тема Re: Optimizing Bitmap Heap Scan.
Дата
Msg-id 89433.74453.qm@web59514.mail.ac4.yahoo.com
обсуждение исходный текст
Ответ на Re: Optimizing Bitmap Heap Scan.  (niraj patel <npatel@gridsolv.com>)
Ответы Re: Optimizing Bitmap Heap Scan.  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
Re: Optimizing Bitmap Heap Scan.  (Robert Haas <robertmhaas@gmail.com>)
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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;


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