Oracle-L: RE: col_usage$ question

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 18 Nov 2003 09:59:25 -0800
Message-ID: <F001.005D710F.20031118095925@fatcity.com>

Thanks Wolfgang.

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, November 18, 2003 11:59 AM To: Multiple recipients of list ORACLE-L

That is a new table in Oracle 9 and is used by Oracle to track what columns are used in predicates. At present the only use of that information that I am aware of is in the procedure dbms_stats.gather_table_stats ( ..., method_opt => 'for columns ... size auto');

At 09:29 AM 11/18/2003, you wrote:

>Does anyone know what this table (sys.col_usage$) is used for? To me it
>sounds like something that CBO might appreciate ... but any ideas? It is
>referenced by dbms_stats and dbms_stats_internal packages ...
>
>Thanks in advance
>Raj
>--------------------------------------------------------------------------------
>
>Rajendra dot Jamadagni at nospamespn dot com

Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com

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Author: Jamadagni, Rajendra
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Received on Tue Nov 18 2003 - 11:59:25 CST