Default PSORT_NPROCS values for detached indexes
If the PSORT_NPROCS environment variable is set, the
database server uses the specified number of sort threads as an upper
limit for ordinary sorts. If PSORT_NPROCS is not set, parallel
sorting does not take place. If you have a single-CPU virtual processor,
the database server uses one thread for the sort. If PSORT_NPROCS is
set to 0
, the database server uses three threads
for the sort.