Feedback on query for monitoring index usage in 9i

From: Jesse, Rich <Rich.Jesse_at_quadtechworld.com>
Date: Wed, 28 Jul 2004 12:17:52 -0500
Message-ID: <FBE1FCA40ECAD41180400050DA2BC54004E93BBC@qtiexch2.qgraph.com>

Hey all,

Now that we've upgraded to 9.2.0.5.0, I'm looking to see which indexes = are not being used over time, thanks to the new feature. Trying to = monitor this is a pain using the V$OBJECT_USAGE view (which itself is an = oddity -- where's the V_$?) because it'll only show indexes in the = current schema that are already being monitored. I'd like to see = indexes for the whole DB so I can see which ones are not being monitored = as well. So I came up with this SQueaL, based on V$OBJECT_USAGE:

SELECT u.name "OWNER",

	io.name "INDEX_NAME",
	t.name "TABLE_NAME",
	DECODE(bitand(i.flags, 65536), 0, 'NO', 'YES') "MONITORING",
	DECODE(bitand(NVL(ou.flags,0), 1), 0, 'NO', 'YES') "USED",
	ou.start_monitoring "START_MONITORING",
	ou.end_monitoring "END_MONITORING"

FROM sys.obj$ io, sys.obj$ t, sys.ind$ i, sys.object_usage ou, sys.user$ = u

WHERE t.obj# =3D i.bo#
	AND io.owner# =3D u.user#
	AND io.obj# =3D i.obj#
	AND u.name NOT IN ('SYS','SYSTEM')
	AND i.obj# =3D ou.obj#(+);

The output looks to be correct on our test DBs, but I'd like to get some = feedback from y'all as to any possible gotchas.

Thanks!
Rich

Rich Jesse                        System/Database Administrator
rich.jesse_at_quadtechworld.com      QuadTech, Sussex, WI USA


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Received on Wed Jul 28 2004 - 12:14:38 CDT