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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72 IBM IMS Version 12 Technical Overview
When VSAM or OSAM buffers are updated or deleted, the system is obliged to execute
quiescing activity to implement the new values. This is differs for VSAM and OSAM, as
explained here:
For VSAM, when the UPDATE POOL command is issued to add, change, or delete one or
more VSAM buffer pools, IMS must internally quiesce application activity against the
affected buffer pools. The UPDATE POOL command must wait until all update activity has
been committed and hardened to the database data sets
For OSAM, when the UPDATE POOL command is issued to add, change, or delete one or
more OSAM buffer pools, IMS must ...
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