October 2006
Intermediate to advanced
160 pages
4h 9m
English
book
DB2 for z/OS: Data Sharing in a Nutshell
by Paolo Bruni, Mark Anders, KyengDong Park, Mark Rader, Judy Ruby-Brown
Content preview from DB2 for z/OS: Data Sharing in a Nutshell
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Chapter 3. The coupling facility 53
The idea behind these recommendations is to trickle castout at a reasonable
cost, so the other thresholds trigger castout instead of the GBP checkpoint. For
large GBPs, the checkpoint would castout many pages at once.
If you knew exactly which type of data is in each GBP (such as frequently
re-referenced, never re-referenced) you can choose better thresholds than those
we describe. Our experience is that most users do not know or the content is
mixed (BP2 for indexes) or organized functionally (BP3 for partitioned table
spaces, BP4 for Application A), so the general case will be best.
In order to minimize the ...
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