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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54 Data Sharing in a Nutshell
3.3.1 Group buffer pools (GBP) or user-managed pools
Group buffer pool duplexing was introduced in DB2 V5, in the late 1990s. It was
important because a total CF failure involved lengthy recovery and there were no
other alternatives at the time.
WIthout duplexing, there are two conditions that can occur if there is a disruption
to the CF or its connections:
Condition 1: If there is connectivity lost between a CF and one of the
members of the data sharing group, but there is at least one other member
that can read the GBP, the condition is detected automatically by a DB2 with
connectivity. If the STRUCTURE REBUILDPERCENT parameter is coded
(we recommend 1%) and it is less than the SFM weight, then a DB2 with
connectivity ...
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