March 2003
Intermediate to advanced
282 pages
9h 13m
English
book
IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
by Jouko Jantti, Juan Jesœs Iniesta Mart’nez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
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© Copyright IBM Corp. 2003. All rights reserved. 47
Chapter 3. Data sharing integrity
components
Database integrity is a fundamental design point of IMS and is defined as:
To maintain integrity, database updates must occur only on a transaction consistent basis,
meaning that:
None of the effects of a transaction can be visible to other programs until the transaction
reaches a commit point. The data items that will be affected by updates are inaccessible
(locked) during the updating process.
All the effects of a transaction (multiple updates to multiple databases) are made available
to other applications and programs after the commit point f
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