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PARALLEL_ADAPTIVE_MULTI_USER, when set to
true, enables an adaptive algorithm designed to improve performance in multiuser environments that use parallel execution. The algorithm automatically reduces the requested degree of parallelism based on the system load at query startup time. The effective degree of parallelism is based on the default degree of parallelism, or the degree from the table or hints, divided by a reduction factor.
The algorithm assumes that the system has been tuned for optimal performance in a single-user environment.
Tables and hints use the default degree of parallelism.
Oracle Database SQL Language Reference for more information about optimizer hints