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  Oracle Tips by Burleson

OCP Instructors Guide for Oracle DBA Certification

Chapter 5 - Oracle Database Objects

Which Partitioning Technique Do I Choose?

Range/hash composite partitioning provides the manageability and availability benefits of range partitioning with the data distribution advantages of hash partitioning. Data skew is unlikely, because the user can always add or drop subpartitions within a partition to maintain even distribution of each container. Rolling windows of historical data are easily maintained by adding or dropping primary partitions with no effect on subpartitions in other primary partitions.

The range-list composite partitioning method provides for partitioning based on a two-level hierarchy. For example, the primary partition could be based on a date range to allow rolling window operation to occur and the second level could be based on a logical grouping (a list of state codes (i.e. PA, NY, OH, etc.) is an good example of a logical grouping). The data would be divided according to the date range and divided again according to the state’s abbreviation.

The Oracle Database Performance Tuning (1Z0-033) certification test will contain a few questions on tablespace partitioning.  Test candidates should understand:

  • The basic partitioning algorithms (range, list, hash, composite)

  • How to specify partitioning during table creation

  • When to use a specific partitioning algorithm

The above text is an excerpt from:

OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot

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