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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68 IBM IMS Version 12 Technical Overview
3.1 Full function database enhancements
IMS 12 provides several improvements for traditional databases. Within this category, the
database types HIDAM, HDAM, HISAM, and SHISAM are classified, with or without
secondary indexes and logical relationships.
3.1.1 Overview of the database pool storage enhancements
In IMS Version 12, the storage for certain database pools is now obtained in 31-bit virtual
storage backed by
64-bit real storage. If you page fix any of these pools and have 64-bit real
storage on your processor, you might see a reduction in the use of 31-bit fixed real frames,
which can influence system paging.
The 31-bit virtual storage for the following database pools is now backed up by 64-bit ...
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