October 2011
Intermediate to advanced
510 pages
18h 48m
English
book
IBM IMS Version 12 Technical Overview
by Paolo Bruni, Isabelle Bruneel, Angie Greenhaw, Dougie Lawson, Jorge Alberto Luz Ribeiro, Egide Van Aershot
Content preview from IBM IMS Version 12 Technical Overview
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66 IBM IMS Version 12 Technical Overview
2.9.3 OSAM data extent blocks
Previous IMS versions created two DEBs for each OSAM data set. The DEB contains
information about the physical characteristics of the data set and other information that the
control program uses. For database data sets, these DEBs were in the DLISAS region. For
system data sets, these DEBs were in the control region.
IMS 12 has changed the storage requirements for OSAM DEBs. IMS 12 eliminates one of the
DEBs for each OSAM data set. Because each DEB requires approximately 300 bytes, this
reduction might be significant for users with many OSAM database data sets.
2.9.4 Reduced aliases in RESLIB
Various IMS load modules contain aliases, which make them error-prone when service ...
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