RE: autotrace issue
- From: "Yasin Baskan" <yasbs@xxxxxxxxxxxxxx>
- To: <madan.sanjay@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 14 Oct 2005 14:37:08 +0300
Isn't it normal that the plan changes with the actual value in the where
clause. That is what the optimizer does. You can use a bind variable
instead of that literal and see what the plan is.
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Sanjay Madan
Sent: Friday, October 14, 2005 2:01 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: autotrace issue
Hi ,
Oracle 9.2.0.5 on AIX
Partitioned table ( list) ~ 10 mil rows in all distibuted almost equally
across 5 partitions
field1 ( used in the query) is not the PK.
My autotrace ( traceonly explain) output for a particular query changes
with the actual value of the input parameter.
select .......
where ...........
and field1 = 123456
autotrace output shows an Index range scan whereas
select .......
where ...........
and field1 = 1234561
autotrace output shows a full table scan
(not the exact input values) ...
I have tried values
-both within and outside the field lengths of field1
-values actually existing in the table
-values NOT existing in the table.
It seems to be happening randomly. For most values it shows an index
range scan.
For others (fewer) it shows a full table scan.
Any hints as to what could be happening or where I should look to solve
the problem ?
Thanks
sanjay
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