JCL ⭐ Featured
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Q: Explain SPACE parameter options

Answer:
SPACE=(unit,(primary,secondary,directory)). Unit: TRK/CYL/block-size. Primary allocated first, secondary in 15 increments. Directory only for PDS. RLSE releases unused. CONTIG requires contiguous. Example: SPACE=(CYL,(10,5,20),RLSE)
space allocation storage
JCL ⭐ Featured
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Q: What is RLSE subparameter?

Answer:
RLSE releases unused space at close. SPACE=(CYL,(10,5),RLSE). Returns unused secondary allocations. Good practice for new datasets. Saves disk space. May cause allocation issues if reextended.
rlse space release
VSAM ⭐ Featured
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Q: How to handle RLS (Record Level Sharing)?

Answer:
RLS allows VSAM access without exclusive control. Define with SHAREOPTIONS and LOG. Enable RLS at VSAM level. CF lock structure coordinates. Better than old batch/CICS conflicts.
rls sharing cf
CICS
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Q: Explain CICS web support

Answer:
CICS handles HTTP. EXEC CICS WEB READ/WRITE. URIMAP defines URLs. Programs handle requests. JSON/XML responses. Modern application interface.
web http urimap