June 2003
Intermediate to advanced
392 pages
13h 3m
English
book
IMS in the Parallel Sysplex Volume III IMSplex Implementation and Operations
by Jouko Jantti, Juan Jesús Iniesta Martínez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume III IMSplex Implementation and Operations
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Chapter 2. Implementing IMS shared queues 53
may be able to take one only occasionally, such as once a day. So the log stream staging and
spill data sets may need to be able to hold two days worth of log data. A lot depends on how
frequently structure checkpoints can be taken.
Spill data sets
System Logger spill data sets are used to off load MSGQ and EMHQ log streams when
structure reaches HIGHOFFLOAD threshold. They are single extent VSAM linear data sets. If
it is SMS managed, which is recommended, consider defining the following SMS parameters
in LOGR policy:
DATACLAS
STORCLAS
MGMTCLAS
SIZE
System Logger dynamically allocates up to 168 volumes for the spill data sets when needed.
Starting from OS/390 Release 3, the user may specify the ...
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