increase in waits when index monitoring is on
- From: Dba DBA <oracledbaquestions@xxxxxxxxx>
- To: ORACLE-L <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 8 Feb 2012 14:35:47 -0500
DB Version: 10.2.0.5
I want to turn index monitoring on in spots to see if some of our indexes
are being used. We have an very active OLTP, so before doing that I am
running some tests of index monitoring.
Has anyone else noticed this? This is fairly large for the simple tests I
am running
tool: runstats
I have a database all to myself
Using one of our tables.
2 indexes
1 column non-unique
4 column unique
I made a copy of this table with the same indexes. So one table would have
index monitoring turned on and one did not have index monitoring turned.
The increase in waits happens on inserts. I am inserting 50 records at a
time as a test.
I have run this test many times and the waits are consistent. I also
dropped and created new tables. This increase is consistent.
I also change the test so that the 2nd insert is to the table with index
monitoring.
I am not turning index monitoring on during the test. I have 2 different
tables. One with index monitoring and one with out (doing that would skew
the results)
Run 1 is on a table with index monitoring on 1 non-unique index
Run 2 does not have index monitoring on.
LATCH.library cache lock 214 32 -182
LATCH.row cache objects 321 93 -228
STAT...recursive calls 304 2 -302
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