DB2 9 for z/OS Hints and Tips for Application Programmers

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INTERSECT/EXCEPT V8 V9 R1 R2 R1 R2 R1 R2 UNION INTERSECT EXCEPT subselect (fullselect) DISTINCT UNION EXCEPT ALL subselect (fullselect) INTERSECT
INSTEAD OF Triggers V8 • No unified mechanism for controlling read and write access by an application (e.g. encryption) • Views are used for read access control • Triggers on base table are used for write access control • No INSERT/UPDATE/DELETE for read-only views (e.g. joins) V9 • A new type of trigger (in addition to BEFORE and AFTER triggers) • Can only be defined on views • DB2 only executes the triggeredaction instead of the action against the subject view • application still believes all operations are performed against the view • Provides means to update views that are considered read-only by DB2
Page 1 and 2: DB2 9 for z/OS Hints and Tips for A
Page 3 and 4: DB2 9 - A Rich, Features Filled Rel
Page 5 and 6: ORDER BY and FETCH FIRST in Subsele
Page 7 and 8: New Techniques to Retrieve LOBs: FE
Page 9 and 10: New Data Types: BINARY and VARBINAR
Page 11 and 12: New Data Type: BIGINT V8 BIGINT (bi
Page 13 and 14: Virtual Indexes a.k.a. ‘What If
Page 15 and 16: TRUNCATE TABLE V8 Alternative way o
Page 17: MERGE Example MERGE INTO account AS
Page 21 and 22: Support for Optimistic Locking V8 W
Page 23 and 24: LOB Performance and Concurrency Enh
Page 25 and 26: Miscellaneous LOB File Reference su
Page 27 and 28: More Stored Procedures Enhancements
Page 29 and 30: DB2 9 for z/OS RedBooks & RedPapers

DB2 9 for z/OS Hints and Tips for Application Programmers

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