PSO

from The Free On-line Dictionary of Computing (8 July 2008)
Oracle Parallel Server
Parallel Server Option
PSO

   <database> (OPS) An {Oracle} configuration that allows for
   multiple Oracle servers running on seperate computers to
   access the same database files simultaneously.

   Normally used for {high availability}, running parallel
   servers can improve performance by spreading out {CPU} load,
   however, it requires data to be partitioned correctly.

   This feature is enabled with the Parallel Server Option (or
   "PSO").

   Oracle Parallel Server Option FAQ
   (http://orafaq.com/faqops.htm).

   (2003-04-05)