December 2011
Intermediate to advanced
410 pages
9h 59m
English
book
CICS Transaction Server from Start to Finish
by Chris Rayns, Sarah Bertram, George Bogner, Chris Carlin, Andre Clark, Amy Ferrell, Gordon Keehn, Peter Klein, Ronald Lee, Erhard Woerner
Content preview from CICS Transaction Server from Start to Finish
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104 CICS Transaction Server from Start to Finish
3.1 VSAM and RLS
Virtual Sequential Access Method (VSAM) was introduced as a collection of
three data set organizations, sequential, indexed and direct-access by IBM in the
early 1970s. Historically, access to the VSAM files was facilitated by CICS on
behalf of the program being executed. This function shipping was managed by
any sending CICS, but access to the data was managed by the FOR. As
business requirements changed, the affinity created by having data directly
accessed by one CICS region on one LPAR became apparent. Even though the
shared data table function was available, this can only be facilitated on one LPAR
as read operations only.
Record Level Sharing (RLS) allows multiple CICS regions ...
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