Dear List,
Firstly - Merry Christmas to those who have not already departed for the
holiday season.
I'm currently doing some investigation based around indexes and would like
everyone's opinion: What is everyone's preferred approach to identify
redundant (as in "never used by Oracle") indexes? I believe Oracle 9 might
have a feature to set a flag on objects and then check back later to see if
they have been accessed however we're still stuck on 8.1.7.4 (Solaris).
Some of my thoughts include:
* Can query for physical disk i/o at a tablespace level easily, however
more difficult to go to an object level.
* Could create a trace file and then inspect explain plans for existence of
index accesses, however trace file probably not practical to capture for a
long period of time.
* Ideal statistic would be something along the lines of "index x used y
times in last 24 hours", however a simple "index x was used in the last 24
hours" would be ok.
Obviously we are searching for indexes to remove and identifying those
which aren't queried over a set period of time would be good candidates for
a starting point. Any advice you might have would be greatly appreciated.
Regards,
Mark.
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Author: Mark Richard
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