RE: HOW TO KNOW INDEX NOT IN USE?

Tony is thinking along the same lines I was. Go ahead and capture the outlines and then querying the DD where the indexes aren't found in the OL$HINTS.HINT_TEXT column could tell you what indices haven't been used. Something like:

select i.owner, i.table_name, i.index_name from dba_indexes i, outln.OL$HINTS h
where index_name not like ('%'||hint_text||'%')   and owner not in ('SYS','SYSTEM','PORTAL30','DES6I')

Just add the schema's to exclude. Only as good as the code coverage from your collection timeframe but still seems like a pretty solid approach.

Anyone tried this? I've kicked it around but have never actually tried it in anything other than a test environment.

Regards,

Larry G. Elkins
elkinsl_at_flash.net
214.954.1781
-----Original Message-----
Sent: Monday, February 04, 2002 4:31 PM
To: Multiple recipients of list ORACLE-L

Another option you have if your Oracle version is high enough is to use Stored Outlines. Enable automatic generation of stored outlines for a full processing cycle as defined by the application (full month, Qtr, etc.) Then extract all of the indexes used during that cycle from OL$HINTS.HINT_TEXT
(i.e.. WHERE HINT_TEXT LIKE 'INDEX%'). If all of your application code has
been traversed in the cycle then this list will be pretty darn close to real usage. Even if you can't wait until year-end processing, you can eliminate the bulk of code to be mined for embedded SQL and focus on those once-a-year programs.
HTH
Tony Aponte
-----Original Message-----
Sent: Monday, February 04, 2002 12:55 PM 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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Author: Larry Elkins
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