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 59
3.4.2 System-managed duplexing for DB2 lock and other structures
System-managed duplexing can provide protection against a double failure.
The duplexed lock structure and SCA will fall back to simplex, as the duplexed
GBPs would do. As we have seen at 3.3.2, “System-managed duplexing” on
page 55, none of this processing occurs without the cost of about 3 times or
more than a simplexed lock access. It is probable that a conversion to
asynchronous will occur for most locks. The asynchronous lock service time
(as measured by the RMF CF activity report) is likely to be the predominate lock
access time, and is significantly longer than synchronous access.
While the ICF itself is less expensive than an external ...
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