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OIC(A) again

Issues with OICA/OIC (OPTIMIZER_INDEX_COST_ADJ/OPTIMIZER_INDEX_CACHING) parameters have already been mentioned many times. Recently I’ve noticed one more and I think I didn’t see this case somewhere else on the Internet so I’ll share it.

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Native full outer join

Starting with version 11gR1 Oracle database uses native FULL JOIN implementation based on HASH JOIN whenever possible. It’s good to know that this functionality first appeared in Oracle and could be used to overcome different issues, including performance and bugs. Here is an example appeared on the SQL.ru recently:

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