CICS ⭐ Featured
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Q: What is the purpose of COMMAREA in CICS?

Answer:

COMMAREA (Communication Area) is used to pass data between programs or between transactions in pseudo-conversational programming.

Uses:

  • Pass data between LINK/XCTL programs
  • Save data between pseudo-conversational transactions
  • Maximum size: 32KB

How it works:

  1. Calling program: COMMAREA option on LINK/XCTL/RETURN
  2. Called program: DFHCOMMAREA in LINKAGE SECTION
  3. Check EIBCALEN for length (0 = no COMMAREA)
* Calling program
EXEC CICS LINK
    PROGRAM('SUBPROG')
    COMMAREA(WS-DATA)
    LENGTH(100)
END-EXEC.

* Called program
LINKAGE SECTION.
01 DFHCOMMAREA PIC X(100).

IF EIBCALEN > 0
    MOVE DFHCOMMAREA TO WS-DATA
END-IF.
experienced interview
VSAM ⭐ Featured
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Q: Explain RECORDSIZE parameter

Answer:
RECORDSIZE(average maximum). For variable length records. Average used for space calculation. Maximum is hard limit. Fixed length: same average and max. Space formula uses average.
recordsize variable length
VSAM ⭐ Featured
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Q: What is maximum VSAM key length?

Answer:
Maximum key length is 255 bytes. KEYS(255 offset). Practical limits lower for performance. Index size grows with key. Keep keys reasonably sized.
key length maximum
VSAM
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Q: What causes file status 34?

Answer:
Status 34 is boundary violation or record too large. Record exceeds defined maximum. Check RECORDSIZE definition. May have wrong record format. Truncation not automatic.
status-34 boundary error