Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> Re: Should we stop analyzing?

Re: Should we stop analyzing?

From: Tanel Poder <tanel.poder.003_at_mail.ee>
Date: Tue, 30 Dec 2003 15:29:35 -0800
Message-ID: <F001.005DB49A.20031230152935@fatcity.com>








actually with this parameter description I pointed you to, there were pointers to perf tuning guide:
 
<quote about optimizer_dynamic_sampling parameter>

You control dynamic sampling with the OPTIMIZER_DYNAMIC_SAMPLING parameter, which can be set to a value from 0 to 10.

</quote>
 
I haven't tested what happens when you already have statistics and specify dynamic sampling hint, then which stats are used after all... but it's very easy to check out with 10053 trace, it has a lines about dynamic sampling in it when Oracle uses or tries to use dynamic sampling.
 
Tanel.
 
 
----- Original Message -----
From: "Jamadagni, Rajendra" <Rajendra.Jamadagni@espn.com>
To: "Multiple recipients of list ORACLE-L" <ORACLE-L@fatcity.com>
Sent: Wednesday, December 31, 2003 12:24 AM
Subject: RE: Should we stop analyzing?

> Tanel,
>
> I know the values, you are missing my question ... let me re-phrase it ...
>
> 1. To have CBO use dynamic sampling do you have to specify the hint?
> or
> 2. CBO will do that automatically?
>
> Just to let you know, Oracle 9ir2 docs main page is my home page on Mozilla firebird browser and Metalink is my homepage on IE.
> Raj
> --------------------------------------------------------------------------------
> Rajendra dot Jamadagni at nospamespn dot com
> All Views expressed in this email are strictly personal.
> QOTD: Any clod can have facts, having an opinion is an art !
>
>
> -----Original Message-----
> Sent: Tuesday, December 30, 2003 2:44 PM
> To: Multiple recipients of list ORACLE-L
>
>
> Go to tahiti.oracle.com and search for the optimizer_dynamic_sampling
> parameter, you'll see descriptions for it's different values there.
>
> Tanel.
> --
> Please see the official ORACLE-L FAQ:
http://www.orafaq.net
> --
> Author: Jamadagni, Rajendra
>   INET:
Rajendra.Jamadagni@espn.com
>
> Fat City Network Services    -- 858-538-5051
http://www.fatcity.com
> San Diego, California        -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to:
ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from).  You may
> also send the HELP command for other information (like subscribing).
>
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).
Received on Tue Dec 30 2003 - 17:29:35 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US