Parallel Execution and
Oracle RAC parameters
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It is recommended to set the parameters PARALLEL_FORCE_LOCAL on each instance,
to ensure that parallel requests do not span instances.
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As of 11gR2,
EBS customers must set the value of this parameter to TRUE and then are no longer required to set parallel_instance_groups and instance groups for the purpose of
preventing inter-instance sql parallelism in RAC environments.
parallel_force_local=TRUE
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