Ensure enough memory
To maximize available memory and scan resources, the automatically sets
the PDQPRIORITY environment variable to 100
,
if it is not already set. If the PDQPRIORITY environment
variable is set, HPL uses that value.
If the PDQPRIORITY environment variable is
set to 0
or if the PDQPRIORITY environment
variable is disabled on the database server, then HPL cannot unload
multiple devices.