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RE: Monitor Index Usage

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 11 Nov 2003 05:44:29 -0800
Message-ID: <F001.005D6542.20031111054429@fatcity.com>


Richard ... thanks for this advise ... now I can add that to my list of "observations" ...

Thanks
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 11, 2003 8:20 AM To: Multiple recipients of list ORACLE-L

Note that 9.2 has the nice family of v$segment_statistic views that can give you this level of information very easily. It has advantages over v$object_usage in that is gives you an indication on how often indexes are used, rather than that they've been used.

Although sampling and other factors may impact their accuracy, those indexes that have a very high ratio of logical reads to db block changes you know are highly used for "legitimate" index accesses, those closer to a 2-1 ratio are only being accessed mainly due to dml changes.

A bit of investigation and experimentation and these views can be very useful.

Cheers

Richard



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Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com
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