RE: HOW TO KNOW INDEX NOT IN USE?

From: Mark Leith <mark_at_cool-tools.co.uk>
Date: Mon, 04 Feb 2002 13:50:11 -0800
Message-ID: <F001.004057AB.20020204134049@fatcity.com>

Could you conclusively say that? What about those obscure indexes that may have been added for long running reports that get run once every quarter / year end what ever.. Just for example.. Without knowing the nature of the system as well.. It would be pretty hard to tell if an index was *never* used.

-----Original Message-----

Sent: 04 February 2002 20:45
To: Multiple recipients of list ORACLE-L

Hmm...

One option might be to monitor x$bh for blocks belonging to that object every ten minutes for a week. If it doesn't appear, the object can pretty conclusively be called "not in use".

Paul
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Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, February 04, 2002 3:31 PM

Seema,

It is always better to include the OS and database versions to the post :)

Okay.. To answer your question.. If you are using Oracle9i you can find that by querying V$OBJECT_USAGE after turning the monitoring option for the index. If it is pre Oracle9i database there is no direct way of doing this.

Best Regards,
K Gopalakrishnan
Bangalore, INDIA

-----Original Message-----

Sent: Monday, February 04, 2002 9:55 AM
To: Multiple recipients of list ORACLE-L

Hi
I there any view which can tell us which indexes are not in use? Thx
-Seema

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