Rule Definition
The OR operator often generates a table scan.
Remediation
Try to reduce the use of "OR" logical operator in DB2 queries.
Violation Code Sample
SELECT(COND);
WHEN(A)
DO;
...
END;
WHEN(B)
DO;
...
END;
WHEN(C)
DO;
...
END;
Fixed Code Sample
SELECT(COND);
WHEN(A)
DO;
...
END;
WHEN(B)
DO;
...
END;
WHEN(C)
DO;
...
END;
OTHERWISE
DO;
...
END;
Related Technologies
Technical Criterion
Efficiency - SQL and Data Handling Performance
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