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Note that you can set some parameters in such a way that Oracle Database is constrained. Note that parallel statement queuing is only active if PARALLEL_DEGREE_POLICY is set to AUTO.ĭescribes the number of parallel execution processes or threads that a CPU can handle during parallel execution. The number of parallel execution server processes available to run queries before parallel statement queuing is used. The execution time, as estimated by the optimizer, above which a statement is considered for automatic parallel query and automatic derivation of DOP.Ĥ X CPU_COUNT X PARALLEL_THREADS_PER_CPU X ACTIVE_INSTANCE
Parallels settings serial#
With the default value of 0, a parallel statement executes serial if no parallel server processes are available. Specifies the minimum percentage of requested parallel execution processes required for parallel execution. Increasing this setting can help balance the startup cost of a parallel statement, but requires greater memory usage as these parallel execution processes are not removed until the database is shut down. Specifies the number of parallel execution processes to be started and reserved for parallel operations, when Oracle Database is started up.
Parallels settings how to#
See Oracle Database Performance Tuning Guide for descriptions of how to use PGA_AGGREGATE_TARGET in different scenarios. The value of PGA_AGGREGATE_TARGET can be derived when MEMORY_TARGET is set. If you set it too high, memory resource shortages may occur during peak periods, which can degrade performance. If you set this parameter too low, some queries may not have a parallel execution process available to them during query processing. As demand increases, Oracle Database increases the number of processes from the number created at instance startup up to this value. Specifies the maximum number of parallel execution processes and parallel recovery processes for an instance. Restricts parallel execution to the current Oracle RAC instance.ĬPU_COUNT x PARALLEL_THREADS_PER_CPU x (2 if PGA_AGGREGATE_TARGET > 0 otherwise 1) x 5 These buffers are allocated out of the shared pool. The size of the buffers used by the parallel execution servers to communicate among themselves and with the query coordinator. By default, all of these features are disabled. Table 8-3 Parameters and Their Defaults ParameterĬauses parallel execution SQL to throttle degree of parallelism (DOP) requests to prevent system overload.ĬPU_COUNT X PARALLEL_THREADS_PER_CPU X ACTIVE_INSTANCESĬontrols the maximum DOP a statement can have when AUTO DOP is in use.Ĭontrols whether auto DOP, parallel statement queuing and in-memory parallel execution are used.