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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.
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CICS ⭐ Featured
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Q: What is COMMAREA and how to use it?

Answer:
COMMAREA (Communication Area) passes data between programs and transactions. EXEC CICS LINK/XCTL COMMAREA(data) LENGTH(len). Receiving program has DFHCOMMAREA in LINKAGE. Max 32KB. Preserved across pseudo-conversational iterations.
commarea data communication
DB2
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Q: What is SQLCA structure?

Answer:
SQLCA (SQL Communication Area) contains execution results. SQLCODE for return code. SQLERRM for message. SQLERRD(3) for rows affected. SQLWARN for warnings. INCLUDE SQLCA in WORKING-STORAGE. Check after each SQL statement.
sqlca structure error