RE: How many is too many
Date: Fri, 12 Aug 2011 19:42:13 +0000
Message-ID: <BAA6E28B6241F046AED1E62D8697516C4E393D58_at_COPDCEXMB08.cable.comcast.com>
I don't think it is so much a number as "is the index used". You can use the "alter index [no]monitoring" command to turn on monitoring and then watch v$object_usage to see which are used. Make sure you observe over a good time period to ensure you don't miss any reports that are not run too often.
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Ram Raman
Sent: Thursday, August 11, 2011 2:45 PM
To: ORACLE-L
Subject: How many is too many
Listers,
I am looking at a table in our system and it has 12 indexes, we are planning on adding another one. I am aware of the effects of having too many indexes, but in this case adding an extra index helps a certain query that runs slow. Other queries and most other operations against the table are acceptable too. I see a few tables like this; is there a number above which is considered a no-no when it comes to adding more indexes.
PS. The tables and queries are structured in a way that seem to require several indexes - it is a third party product.
TIA,
Ram.
-- http://www.freelists.org/webpage/oracle-lReceived on Fri Aug 12 2011 - 14:42:13 CDT