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Eliminate "parallel degree" terminology.
This terminology provoked widespread complaints. So, instead, rename the GUC max_parallel_degree to max_parallel_workers_per_gather (leaving room for a possible future GUC max_parallel_workers that acts as a system-wide limit), and rename the parallel_degree reloption to parallel_workers. Rename structure members to match. These changes create a dump/restore hazard for users of PostgreSQL 9.6beta1 who have set the reloption (or applied the GUC using ALTER USER or ALTER DATABASE).
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@ -167,7 +167,7 @@
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#effective_io_concurrency = 1 # 1-1000; 0 disables prefetching
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#max_worker_processes = 8 # (change requires restart)
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#max_parallel_degree = 2 # max number of worker processes per node
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#max_parallel_workers_per_gather = 2 # taken from max_worker_processes
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#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is immediate
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# (change requires restart)
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#backend_flush_after = 0 # 0 disables,
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