z/OS MVS JCL Reference
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Defaults

z/OS MVS JCL Reference
SA23-1385-00

In compatibility mode, if no PERFORM parameter is specified or if the specified PERFORM number fails validity checks, the system uses an installation default specified at initialization. If the installation did not specify a default, the system uses a built-in default:

Default Use
1 For non-TSO/E job steps
2 For TSO/E sessions

See z/OS MVS Initialization and Tuning Guide for details.

Parent topic: PERFORM parameter

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