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Oracle® Database Reference
11g Release 1 (11.1)

B28320-03
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PARALLEL_ADAPTIVE_MULTI_USER

Property Description
Parameter type Boolean
Default value true
Modifiable ALTER SYSTEM
Range of values true | false

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.

See Also:

Oracle Database Performance Tuning Guide for more information on tuning parallel execution and on the algorithm described here