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composite partitioning tips

Oracle Database Tips by Donald BurlesonFebruary 17, 2015

Question:  How does composite partitioning work in Oracle?  When would I choose composite partitioning over regular partitioning?

Answer:  Composite partitioning partitions the data rows using the range method, and within each partition, Oracle subpartitions the data using many methods.  Oracle experts note that composite partitioning supports historical operations, such as adding new range partitions, but also provides higher degrees of parallelism for DML operations and finer granularity of data placement through sub-partitioning.

Range-Hash composite partition:  (as of Oracle 8i)This composite partitioning uses range partitioning first, then spreads data into a hash partition. Possible usage: range partition by date of birth then hash partition by name; store the results into the hash partitions.  Composite range-hash partitioning provides the improved manageability of range partitioning and the data placement, striping, and parallelism advantages of hash partitioning.

Range-List composite partitioning:  (as of Oracle9i) This composite partitioning uses range partitioning  first, then spreads data into list partitioning. Possible usage: range partition by date of birth then list partition by state, then store the results into the list partitions.  Composite range-list partitioning provides the manageability of range partitioning and the explicit control of list partitioning for the subpartitions.

Starting in Oracle11g we see these additional composite partitioning methods:

Range-Range composite partitioning: (as of 11g)  This composite partitioning uses range partitioning  first, and then spreads the data again based on range.

List-Range composite partitioning: (as of 11g)  This composite partitioning uses list partition first, and then spreads the data again based on range partitioning .

List-Hash composite partitioning: (as of 11g)  This composite partitioning uses list partitioning first, and then spreads the data again based on hash.

List-List composite partitioning: (as of 11g)  This composite partitioning uses  list partitioning first, and then spreads the data again based on  list partitioning.

Interval-Hash
composite partitioning: Interval partitioning is an enhancement to range partitioning in Oracle 11g and interval partitioning automatically creates time-based partitions as new data is added.  This composite partitioning uses interval partitioning  first, and then spreads the data again based on a hash partition.

Interval-List
composite partitioning: (as of 11g)  This composite partitioning uses  interval partitioning first, and then spreads the data again based on a sub list.

Interval-Range
composite partitioning: (as of 11g)  This composite partitioning uses  interval partitioning first, and then spreads the data again based on range.

Also see my notes on partition pruning to improve response time.

Please see related partitioning pages:

Justifying Oracle partitioning

Oracle Partitioning

Oracle interval partitioning tips

Oracle Partition Key Statistics & tuning

   
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