March 2003
Intermediate to advanced
282 pages
9h 13m
English
book
IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
by Jouko Jantti, Juan Jesœs Iniesta Mart’nez, Knut Kubein, Bill Stillwell, Gary Wicks
Content preview from IMS in the Parallel Sysplex Volume I: Reviewing the IMSplex Technology
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52 IMS in the Parallel Sysplex, Volume I: Reviewing the IMSplex Technology
Level or state
Locks are requested at a level. This is also called the
state.
The level is used to determine
whether another lock holder can hold the lock concurrently. The IRLM uses a matrix to
determine if two levels match. Levels typically vary according to what the requestor might
do with the resource. For example, a reader requests a Level 4 lock for a database record.
An updater requests a Level 6 record for a database record. Level 4 locks are compatible
with each other, but not with Level 6 locks. This allows two readers to share a database
record, while an up ...
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