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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84 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
4.2 Fast Path DEDB VSO sharing
The virtual storage option (VSO) was introduced with IMS Version 5 to replace MSDBs. VSO
provides similar benefits to main storage database users, because there is no call related I/O.
Before shared VSO, basic VSO used OS/390 data spaces as its local cache storage area for
DEDB AREA data. There are also a few additional enhancements included with the basic
VSO feature:
Insert and delete calls are supported.
VSO Fast Path AREAs are supported by DBRC.
Standard utilities are now available to the user.
VSO allows designs to use the full DEDB hierarchical model.
Field level (FLD) calls are supported, so that applications that access MSDB ...
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