VSAM ⭐ Featured
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Q: Explain SHAREOPTIONS parameter

Answer:
SHAREOPTIONS(crossregion,crosssystem). Values: 1=exclusive, 2=read share/write exclusive, 3=full sharing, 4=full sharing no buffer refresh. SHAREOPTIONS(2 3) is common. Higher sharing needs application coordination.
shareoptions sharing concurrency
JCL ⭐ Featured
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Q: What is REGION parameter?

Answer:
REGION specifies memory limit. REGION=0M means no limit (use system default). REGION=4M limits to 4MB. On JOB card affects all steps, on EXEC affects that step. Below 16M line: REGION=2048K. Modern systems often use REGION=0M.
region memory allocation
CICS ⭐ Featured
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Q: Explain CICS regions

Answer:
CICS region is address space. TOR (Terminal Owning) owns terminals. AOR (Application Owning) runs programs. FOR (File Owning) owns files. MRO connects regions. Workload distribution.
region tor aor
CICS
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Q: What is MRO?

Answer:
MRO (Multi-Region Operation) connects CICS regions. Function shipping sends requests to owning region. Transaction routing sends terminal to AOR. DPL (Distributed Program Link) for remote LINK.
mro distributed regions
CICS
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Q: What is CICS resource protection?

Answer:
Protection via RACF/external security. SEC=YES on region. QUERY SECURITY for checks. SECLABEL for levels. Program security attributes.
protection security racf