System values: Performance overview
You can use IBM® i performance system values to view and change priority, performance adjustments, and processing values for the system.
To access the performance category of system values from IBM Navigator for i, select Configuration and Services and then select System Values.
IBM Navigator for i uses descriptive names for system values. The following table provides a quick overview of the performance system values available in IBM Navigator for i (and their counterparts in the character-based interface).
| Name in IBM Navigator for i | Description of system value | Name in character-based interface |
|---|---|---|
| Base memory pool maximum eligible threads | This system value specifies the maximum number of eligible threads for the base memory pool. | QBASACTLVL |
| Base memory pool minimum size | This system value specifies the minimum base memory pool. | QBASPOOL |
| Communications arbiter jobs at restart | This system value specifies the number of communications arbiter system jobs that are available to process work for controllers and devices. | QCMNARB |
| Communications configuration recovery | This system value specifies whether communications recovery attempts are made and how many attempts to take. | QCMNRCYLMT |
| Allow background database statistics collection | This system value specifies the types of requests for database file statistics collection that are allowed to be processed by system job QDBFSTCCOL. | QDBFSTCCOL |
| Dynamically adjust job priorities of interactive jobs | This system value sets the job priorities of interactive jobs | QDYNPTYADJ |
| Dynamically adjust job priorities within priority bands | This system value sets the task scheduling policy. | QDYNPTYSCD |
| Lock libraries in a user job's library search list | This system value prevents other jobs from deleting or renaming the libraries in the search list. | QLIBLCKLVL |
| Maximum eligible threads | This system value specifies the maximum number of eligible threads. | QMAXACTLVL |
| Machine memory pool size | This system value specifies the size of the machine memory pool. | QMCHPOOL |
| Available display station pass-through server jobs | This system value specifies the number of pass-through server jobs that are available to process IBM i display station pass-through, IBM i Access workstation function (WSF), and other 5250 emulation programs on programmable workstations. | QPASTHRSVR |
| Automatically adjust memory pools and activity levels | This system value specifies when to automatically adjust memory pools and activity levels. | QPFRADJ |
| Parallel processing for queries and indexes | This system value specifies whether to use parallel processing. | QQRYDEGREE |
| Database query time limit | This system value sets the time limit for a database query. | QQRYTIMLMT |
| Automatically adjust thread resources | This system value specifies whether the system should dynamically make adjustments to the affinity of threads currently running on the system. | QTHDRSCADJ |
| Thread affinity | This system value specifies whether secondary threads have affinity to the same group of processors and memory as the initial thread. | QTHDRSCAFN |
| Move interactive jobs to base pool at end of time slice | This system value specifies whether to move interactive jobs to the base pool at the end of the time slice. | QTSEPOOL |