RE: Index question

From: Lex de Haan <lex.de.haan_at_naturaljoin.nl>
Date: Tue, 10 Aug 2004 17:11:45 +0200
Message-ID: <JFEEIGBIDOCCDALDIPLNGEDCCHAA.lex.de.haan@naturaljoin.nl>

is this a range scan or an equality search? for equality searches, the difference will be minimal -- but range scans will be more expensive. how much? that depends...

is the performance "good enough"? then leave it as is!

Kind regards,
Lex.  

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

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Rick Stephenson Sent: Tuesday, August 10, 2004 16:09
To: Oracle ListServ (oracle-l_at_freelists.org) Subject: Index question

I have a query that references Table t column c in the where clause. Table t already has an index on (column c, column d). Is there any reason to add an index to table t that contains just column c? I know that Oracle will use the other index because of the leading column, but is there a performance hit due to it being a composite index?  

I am running Oracle EE 9.2.0.5.  

Thanks,  

Rick Stephenson  

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Received on Tue Aug 10 2004 - 10:20:13 CDT