Re: How many is too many
- From: Kellyn Pot'vin <kellyn.potvin@xxxxxxxxx>
- To: "Jed_Walker@xxxxxxxxxxxxxxxxx" <Jed_Walker@xxxxxxxxxxxxxxxxx>, "veeeraman@xxxxxxxxx" <veeeraman@xxxxxxxxx>, ORACLE-L <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 12 Aug 2011 12:48:12 -0700 (PDT)
When stating an index audit, monitoring was what I was referring to, but in
10g, you have to get a lock on the object to turn on the monitoring...This can
be the biggest hurdle, more so than the overhead of the index or monitoring for
usage.
Kellyn
________________________________
From: "Walker, Jed S" <Jed_Walker@xxxxxxxxxxxxxxxxx>
To: "veeeraman@xxxxxxxxx" <veeeraman@xxxxxxxxx>; ORACLE-L
<oracle-l@xxxxxxxxxxxxx>
Sent: Friday, August 12, 2011 1:42 PM
Subject: RE: How many is too many
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] 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.
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