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Q: What is GRANT and REVOKE?
Answer:
GRANT gives privileges: GRANT SELECT ON table TO user. REVOKE removes: REVOKE SELECT ON table FROM user. Privileges: SELECT, INSERT, UPDATE, DELETE, EXECUTE. WITH GRANT OPTION allows re-granting. Essential for security.
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Q: How to delete VSAM cluster?
Answer:
IDCAMS DELETE ds.name CLUSTER. Or DELETE ds.name FILE(ddname) if DD provided. PURGE overrides retention. ERASE clears data. DELETE removes catalog entry and data/index components.
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Q: Explain DE-EDIT function
Answer:
FUNCTION DE-EDIT converts edited numeric back to numeric. Original: '1,234.56-'. DE-EDIT result: -1234.56. Removes edit characters, preserves numeric value and sign. Useful when receiving edited display data needing calculation.
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Q: What is NOSCRATCH?
Answer:
NOSCRATCH on DELETE keeps data space. Entry removed from catalog but space not released. Rarely used. Normal DELETE releases space. May be useful for recovery scenarios.
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Q: How to use temporary storage?
Answer:
TS queue stores data across tasks. EXEC CICS WRITEQ TS QUEUE(name) FROM(data). READQ retrieves. DELETEQ removes. ITEM number for multiple items. MAIN/AUXILIARY for storage type. Named by string.
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Q: What is ABEND command?
Answer:
ABEND deliberately terminates. EXEC CICS ABEND ABCODE('XXXX'). Causes transaction abend with code. NODUMP suppresses dump. CANCEL removes HANDLE ABEND first. Use for unrecoverable errors.
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Q: How to use UNION?
Answer:
UNION combines SELECT results. UNION removes duplicates, UNION ALL keeps all. Column count and types must match. ORDER BY at end only. UNION expensive due to sort. Use UNION ALL if duplicates OK or impossible.
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Q: How to handle SMS conversion?
Answer:
SMS manages storage automatically. Migrate VSAM to SMS: DATACLAS, STORCLAS, MGMTCLAS. ACS routines for assignment. Remove explicit VOL/UNIT. Benefits: automation, management.
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Q: Explain INHIBIT attribute
Answer:
INHIBIT prevents certain operations. ALTER INHIBITSOURCE prevents REPRO from. ALTER INHIBITTARGET prevents REPRO to. Used for protection. PERMIT removes restriction.
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Q: What is HANDLE ABEND?
Answer:
HANDLE ABEND traps abends. EXEC CICS HANDLE ABEND PROGRAM(abend-prog) or LABEL(abend-para). Allows cleanup before termination. CANCEL removes handler. Use for graceful error handling.
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Q: What is DELETE command?
Answer:
DELETE removes record. EXEC CICS DELETE FILE(name) RIDFLD(key). Or after READ UPDATE: DELETE FILE(name). KEYLENGTH/GENERIC for range delete. NOTFND if key missing. NUMREC returns count deleted.
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Q: What is BIF DEEDIT?
Answer:
BIF DEEDIT removes edit characters. EXEC CICS BIF DEEDIT FIELD(data) LENGTH(len). Converts edited numeric to raw. Removes $, commas, etc. Useful for BMS numeric input.
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Q: How to concatenate strings?
Answer:
Use CONCAT(str1, str2) or || operator. CONCAT('Hello', ' ', 'World'). || works same: col1 || col2. Handles VARCHAR properly. NULL concatenation yields NULL (use COALESCE). RTRIM to remove trailing spaces.