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Q: What is RLSE subparameter?
Answer:
RLSE releases unused space at close. SPACE=(CYL,(10,5),RLSE). Returns unused secondary allocations. Good practice for new datasets. Saves disk space. May cause allocation issues if reextended.
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Q: What is ISSUE ABEND?
Answer:
ISSUE ABEND requests dump without termination. EXEC CICS ISSUE ABEND. Diagnostic snapshot. Continue execution. Alternative to full ABEND. Debug technique.
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Q: Explain DB2 logging
Answer:
DB2 logs all changes for recovery. Active log (circular), archive log (offloaded). LOG YES/NO on DDL. COMMIT writes to log. Recovery uses logs. Log full causes issues - monitor usage.
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Q: What is CHECK utility?
Answer:
CHECK validates data integrity. CHECK DATA TABLESPACE db.ts. Finds constraint violations, orphan rows. CHECK INDEX validates index structure. CHECK LOB for LOB issues. Run periodically or after issues.
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Q: How to handle -803 SQLCODE?
Answer:
-803 is duplicate key violation. Primary key or unique index constraint. Check SQLERRD(3) for index ID. Solutions: check data, use IGNORE_DUPLICATE, handle in program logic. May indicate data quality issue.