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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128 Data Sharing in a Nutshell
These guidelines also apply if you implement system-managed duplexing:
If you currently have a single CF engine per CF, add a second engine when
peak CF CPU utilization exceeds 25%.
If you have a multi engine CF, add another engine when peak CF CPU
utilization exceeds 50%.
7.5 Lock avoidance: CLSN versus GCLSN
Lock avoidance in a data sharing environment uses the same techniques as
those for non-shared DB2s. The only new concept added for this environment is
the global commit log sequence number (GCLSN). For non-GBP-dependent
page sets or partitions, each member uses a local commit log sequence number
(CLSN), which is the lowest uncommitted log sequence number for all active
transactions for a given page set. ...
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