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Oracle band join tips

Oracle Tips by Donald BurlesonMarch 10, 2017

Question: What is the 12.2 new feature called a "band join".  How does this band join differ from other join types?

Answer:  The Oracle 12 release 2 software release a new join type called a band join.  The Oracle docs note that the band join is a special type of non-equijoin in which key values in one data set must fall within the specified range (“band”) of the second data set.

The same table can serve as both the first and second data sets. Starting in Oracle Database 12c Release 2 (12.2), the database evaluates band joins more efficiently. The optimization avoids the unnecessary scanning of rows that fall outside the defined bands. The optimizer uses a cost estimate to choose the join method (hash, nested loops, or sort merge) and the parallel data distribution method. In most cases, optimized performance is comparable to an equijoin.

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