What is Tri merger and what the syntax or how to sort merge in the optimization of the performance


Hello

new IAM for performance how to sort merge and when to do it.

Thanks in advance.

Hello

Merge sort is a method to join two sets of results, which is essentially:

-First game on the join results sort key

-Then put spell on the join key

-Then merge them to produce the output

Like other methods (hash join, nested... loops joins) the cost of the operation is calculated by the CBO, which chooses the cheaper plan.

You can force the plan with the use_merge hint... but why would you do?

Tags: Database

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