To allow multiprocessor configurations to be used to the best advantage, the database system supports external/internal tasking that can be configured.
The aim here is to allow the maximum possible number of database sessions to be supported by the minimum possible number of operating system threads.
The configuration of the database system controls the degree of external/internal tasking using the two general database parameters MAXUSERTASKS and MAXCPU.
On a computer, four processors are available for the database instance. No more than 800 database sessions should be running simultaneously.
You set MAXCPU to four, and MAXUSERTASKS to 800.
The database instance can then utilize up to four processors by establishing four operating system threads, each of which performs internal tasking for up to 200 users.