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 2. Data sharing architecture 21
If a single member with update interest and multiple members with read-only
interest exist, IRLM propagates fewer locks than when all members have
update interest in the same page set.
All P-locks that are held beyond the local IRLM are owned by a member, not
by an individual work unit. This reduces lock propagation by requiring that
only the most restrictive lock mode for an object on a given member be
propagated to the coupling facility. A new lock that is equal to, or less
restrictive than, the lock currently being held is not propagated.
IRLM can release many locks with just one request to the CF. This can occur,
for example, after a transaction commits and has two or more locks that need ...
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