VSAM Performance Enhancement › VPE Operation › VPE Rules Table › SYSOPT Statement

SYSOPT Statement

The following section explains the SYSOPT statement.

SYSOPT	[ALLOW=YES|NO]
[,PRECEDENCE=VPEDD|RULES]

The SYSOPT statement sets global system options. There can be at most one SYSOPT statement. It can be omitted if desired. These options set the default values for your system. They are global in nature and apply to all jobs, steps, and VSAM files unless overridden by more specific rules or special VPE DD cards.

ALLOW=YES|NO

Specifies whether the special VPE DD cards are active or not. If ALLOW=YES is specified (the default), then the special VPE DD cards will affect the operation of VPE. If ALLOW=NO is specified, then any special VPE DD cards will not affect the operation of VPE. Exceptions: The VPEIGNR and VPEVIGNR Control DD cards always disable VPE in that jobstep.

PRECEDENCE=VPEDD|RULES

Specifies which of the two VPE controlling mechanisms takes precedence when there is a conflict between them. If PRECEDENCE=VPEDD is specified (the default), then the special VPE DD statements present in the application JCL take precedence over any conflicting rules in the VPE Rules Table. If PRECEDENCE=RULES is specified, then the opposite is true. This parameter only makes sense if ALLOW=YES is specified.