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 1. Introduction to the Parallel Sysplex 31
Other structure characteristics, such as changing the entry-to-element ratio of a list structure,
can only be initiated by a connector (or by the system if AUTOALTER is enabled). For IMS
structures, only CQS will initiate an alter, and then only to alter the size if it detects that the
structure has reached some user specified threshold of data elements in use.
AUTOALTER
When autoalter is enabled, the system may initiate a structure alter based on one of two
factors:
If the system detects that the storage in use in a structure has reached a structure full
threshold specified in the policy, it may increase the size to relieve the constraint. At this
time it may also alter the entry-to-element ...
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