Re: Column order in indices (oracle 9.2)
- From: genegurevich@xxxxxxxxxxxxxxxxxxxxx
- To: "Derya Oktay" <deryaoktay@xxxxxxxxx>
- Date: Tue, 1 Aug 2006 09:29:44 -0500
Derya,
I have tried a hint, but the explain plan did not change. The stats were
created too. I have opened a SR with
oracle to see what they say
thank you
Gene Gurevich
"Derya Oktay"
<deryaoktay@gmail
.com> To
genegurevich@xxxxxxxxxxxxxxxxxxxxx,
08/01/2006 08:36 oracle-l <oracle-l@xxxxxxxxxxxxx>
AM cc
Subject
Re: Column order in indices (oracle
9.2)
Hi
Using a hint may force to use your index. It may also give an idea if it is
really possible to use the provided index. Further, CBO runs on calculated
statistics be sure you work on correct statistic. The last but not least
is, Oracle may choose the way it use indexes according to table sizes.
Regards.
Derya.
On 8/1/06, genegurevich@xxxxxxxxxxxxxxxxxxxxx <
genegurevich@xxxxxxxxxxxxxxxxxxxxx> wrote:
Hi everybody:
I remember reading that in Oracle 9.2 and higher the order of the columns
in an index does not matter.
That is oracle will be able to quickly search on a column even if it is
not
a leading one. I have a table
with a primary key consisting of three columns. When a table is queried
based on the third column,
the data start coming out immediately, but when I use the second column
the
query just sits there.
Is that an expected behavior? Did I misunderstood something about the
column order?
thanks for any insight
Gene Gurevich
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