RE: Misbehaving select
- From: Jonathan Lewis <jonathan@xxxxxxxxxxxxxxxxxx>
- To: "jack@xxxxxxxxxxxx" <jack@xxxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 5 Nov 2013 08:00:19 +0000
Is it a hash cluster or an index cluster ?
What is the cluster key ?
What's the index definition for the index being used
Can you report the actual execution plan - including predicate section.
Regards
Jonathan Lewis
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] on behalf
of Jack van Zanen [jack@xxxxxxxxxxxx]
Sent: 05 November 2013 00:56
To: oracle-l@xxxxxxxxxxxxx
Subject: Misbehaving select
Hi All,
Oracle 10.2.0.5
AIX 6.1
We have this select statement on a table that is in a cluster by itself and has
an index on it.
if we run the following version of our select it uses the index and returns 2
rows
SELECT distinct(m.channel_number)
FROM table_x m
where m.channel_number=503
and m.metering_system_sid=53799
AND m.gmt_day = to_date('10-09-2013','dd-mm-yyyy')
AND m.VERSION = 1
501 <---- wrong result as we specifically wan t only 503
503
If we force it to use full table scan it returns 1 row
SELECT /*+ full(m) parallel(m 8) */ distinct(m.channel_number)
FROM table_x m
where m.channel_number=503
and m.metering_system_sid=53799
AND m.gmt_day = to_date('10-09-2013','dd-mm-yyyy')
AND m.VERSION = 1
503
Which is correct. this assumes something is not quite right with index, correct?
We have dropped and recreated the index but that was no joy.
I have tried to find something on metalink that would point to possible bug,
but my searches have not come up with anything worthwhile.
Can anybody else shed some light on this
Jack van Zanen
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