JCL ⭐ Featured
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Q: What is PERFORM parameter?

Answer:
PERFORM assigns service class. PERFORM=n (1-999). JES/WLM determines resource allocation. Higher may get more resources. Installation dependent. Modern systems use WLM service classes instead.
perform priority resources
CICS ⭐ Featured
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Q: What is INVOKE SERVICE?

Answer:
INVOKE SERVICE calls web service. EXEC CICS INVOKE SERVICE. PIPELINE processing. SOAP/REST support. Modern integration. Requires CICS TS 3.1+.
invoke webservice soap
CICS ⭐ Featured
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Q: What is CICS Liberty?

Answer:
CICS Liberty embeds Java server. Run Java apps in CICS. RESTful services. Modern application development. Coexists with COBOL. Container environment.
liberty java container
COBOL
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Q: What is SERVICE RELOAD?

Answer:
SERVICE RELOAD refreshes segmented program overlays. Forces segment reload from disk. Rarely needed with virtual storage. From overlay management era. May affect performance. Better to restructure program than use frequently.
service reload segments