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hash partition tips

Oracle Database Tips by Donald BurlesonFebruary 16, 2015

Question:  How do I use the hash partition feature of Oracle partitioning?  Are there examples of using a hash partition, and when should I use hash partitioning?

Answer:  Just like a hash key, hash Partitioning transforms a partitioning key value and maps it to given partition.  Hash partitions use their hashing algorithm to assign rows into partitions, giving the effect of maintaining a relatively even number of records in each partition.

The Oracle docs note that hash partitions have several advantages over range partitioning:

"Hash partitioning enables easy partitioning of data that does not lend itself to range or list partitioning. It does this with a simple syntax and is easy to implement. It is a better choice than range partitioning when:

  • You do not know beforehand how much data maps into a given range

  • The sizes of range partitions would differ quite substantially or would be difficult to balance manually

  • Range partitioning would cause the data to be undesirably clustered

  • Performance features such as parallel DML, partition pruning, and partition-wise joins are important

The concepts of splitting, dropping or merging partitions do not apply to hash partitions. Instead, hash partitions can be added and coalesced."

Please see related partitioning pages:

Justifying Oracle partitioning

Oracle partitioning methods

oracle partitioning tips

Oracle Partitioning

Oracle interval partitioning tips

Oracle Partition Key Statistics & tuning

   
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