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Partition Wise Joins

edited Feb 26, 2015 6:05AM in Database Administration (MOSC) 2 commentsAnswered ✓

The most fundamental parallel execution optimization is a partition-wise join.

If two rather large tables are often joined together in SQL statements, consider the potential benefits of partition-wise joins.

A partition wise join is a join between two tables that are partitioned on the same column with the same partitioning scheme.

Partition-wise joins can be full or partial. Oracle decides which type of join to use.

Partition-wise joins offer benefits :

■ Reduction of Communications Overhead

■ Reduction of Memory Requirements

What exactly is full  PWJ and partial PWJ ?

Question is how oracle decide which PWJ has to be use ?

how PWJ offer benefits ( in simple way) ?

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