Sql Engine - Query Plan (Step|Operation)

Oracle Database Sql Processing


A query plan step is essentially an relational operator with its arguments.


A operation may be:

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An Operation that implements a mathematics set function. A set operation does not return records to the next operation until all of the rows have been processed in contrast to row operation, returning...
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How to read a query plan (ie a execution tree) ? Each row in the output table corresponds to a single step in the execution plan. The first step is the furthest indented to the right. As it's...
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A row operation returns the first records to the next operation quickly. NESTED LOOPS

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