RE: Oracle Partitioning
- From: TJ Kiernan <tkiernan@xxxxxxxxxxx>
- To: "'JBECKSTROM@xxxxxxxxx'" <JBECKSTROM@xxxxxxxxx>, oracle-l-freelists <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 28 Oct 2013 14:26:15 +0000
As with everything, especially Oracle-related, it depends. Query performance
is a part of the consideration. Information lifecycle management and
contention prevention are some other benefits to consider.
As for your questions on query performance, you can certainly reduce the amount
of data scanned if your queries happen to filter on the partition key.
Depending on your partitioning scheme, you may actually find that index access
is more costly than full scans on a few partitions. Indexes can (and generally
should, unless you're maintaining primary/unique keys) be partitioned as well -
either local (using the same partition key as the table) or global -
partitioning on some other column(s). A little bit of research and planning
goes a long way.
HTH,
T. J.
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-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Jeffrey Beckstrom
Sent: Monday, October 28, 2013 8:58 AM
To: oracle-l-freelists; oracle-db-l
Subject: Oracle Partitioning
We are looking into the possibility of licensing the Partitioning option. My
understanding of partitioning is that it only helps when the optimizer can
eliminate partitions. Doesn't that mean that it is primarily of benefit when
accessing the tables via full table scans? In that case, the optimizer could
eliminate partitions from scanning. If, however, you are accessing the data
via an index\, would there be any benefit?
Is my understanding of this correct?
Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority Information Systems
1240 W. 6th Street
Cleveland, Ohio 44113
.
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