<xref linkend="guc-max-worker-processes">. Note that the requested

number of workers may not actually be available at run time. If this

occurs, the plan will run with fewer workers than expected, which may

be inefficient.The default value is 2.Setting this value to 0

be inefficient. Setting this value to 0, which is the default,

disables parallel query execution.

</para>

Costdisable_cost=1.0e10;

intmax_parallel_workers_per_gather=2;

intmax_parallel_workers_per_gather=0;

boolenable_seqscan= true;

boolenable_indexscan= true;

},

&max_parallel_workers_per_gather,

2,0,1024,

0,0,1024,

NULL,NULL,NULL

},

#effective_io_concurrency = 1# 1-1000; 0 disables prefetching

#max_worker_processes = 8# (change requires restart)

#max_parallel_workers_per_gather =2# taken from max_worker_processes

#max_parallel_workers_per_gather =0# taken from max_worker_processes

#old_snapshot_threshold = -1# 1min-60d; -1 disables; 0 is immediate

# (change requires restart)

#backend_flush_after = 0# 0 disables, default is 0