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What is the minimum execution time that a query/statement for a parallel execution

As per documentation its 30 seconds

The parameter is (from 11gr2) is parallel_min_time_threshold which invokes the automatic degree of parallelism when the query execution goes beyond 30 seconds.

Nevertheless, whether you have object parallelism (table/index degree) set or not, if parallel_degree_policy is set to Limited or Auto, Oracle uses parallelism for any queries depends on […]