CICS ⭐ Featured
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Q: What is CHANNEL/CONTAINER?

Answer:
Channels group containers for data passing. EXEC CICS PUT CONTAINER(name) CHANNEL(chan) FROM(data). GET retrieves. Modern alternative to COMMAREA. No 32KB limit. Typed data support.
channel container data
CICS ⭐ Featured
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Q: How to do interval control?

Answer:
START with INTERVAL/AFTER for delayed execution. EXEC CICS START TRANSID(xx) INTERVAL(001000). Or AFTER HOURS(1) MINUTES(30). For scheduled background work. Data via FROM or CHANNEL.
interval start schedule
CICS ⭐ Featured
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Q: How to use RETRIEVE command?

Answer:
RETRIEVE gets data passed via START. EXEC CICS RETRIEVE INTO(area) LENGTH(len). Data from START FROM parameter. Or RETRIEVE CHANNEL for containers. One retrieve per start.
retrieve start data
CICS
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Q: Explain START command

Answer:
START schedules transaction for later. EXEC CICS START TRANSID(trans) AFTER HOURS(1) FROM(data). INTERVAL or TIME for specific time. Data passed in channel/container or FROM/LENGTH. Background processing.
start schedule async