DB2 9 & 10 for z/OS Overview

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Migration Planning WorkshopTimestamp with Time Zone• New data type TIMESTAMP WITH TIME ZONE– SET SESSION TIME ZONE or rely on IMPLICIT_TIMEZONE (DECP)– Year.month.day.hour.minutes.seconds+-timezone• Example: 2011-07-06-11.00.000000-06:00• Comparison takes place after converting internally to UTC• DB2 Special Registers:– CURRENT TIME ZONE special register: ( data type = DECIMAL(6,0) )• Contains the difference between UTC and local time at the current server.– SESSION TIME ZONE special register: ( data type = VARCHAR(128))• Identifies the time zone of the application process.98© 2011 IBM Corporation
Migration Planning WorkshopOptimistic Locking Support• Built-in timestamp for each row or page– Automatically updated by DB2 as a GENERATED ALWAYScolumn– Allows simple timestamp predicate to validate that row hasnot changed since last access• Eliminates need for complex predicates onWebSphere CMP updates, improves performance99© 2011 IBM Corporation
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DB2 9 & 10 for z/OS Overview

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