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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Chapter 4. Additional data sharing facilities 89
timestamps are consistent across all IMSs and can be used by the SDEP Scan utility to
sort the SDEPs after scanning them and before writing them to the output file. The net
effect is that they appear to the end user to be in chronological sequence, just as they
were when they were not shared.
SDEP CI format changes
There have also been some changes to the format of the SDEP CI itself. There are some
new flags and the IMSID of the IMS system which filled that CI. In all, there are an
additional eight bytes of overhead added to the SDEP CI.
Use of the IRLM
Prior to IMS Version 6, SDEP segments and CIs were never locked. The only locking
came in the form of an internal CSDB latch which serial ...
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