l of processes
         established by <a class="xref" href="runtime-config-resource.html#GUC-MAX-WORKER-PROCESSES">max_worker_processes</a>, limited
         by <a class="xref" href="runtime-config-resource.html#GUC-MAX-PARALLEL-WORKERS">max_parallel_workers</a>.  Note that the requested
         number of workers may not actually be available at run time.
         If this occurs, the utility operation will run with fewer
         workers than expected.  The default value is 2.  Setting this
         value