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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Chapter 3. Data sharing integrity components 65
direct space search algorithm, even when the bit map is referenced, the block or control
interval is locked.
Space reclaim and key sequenced data sets
In the block level data sharing environment, KSDS data component CIs for the HISAM
primary data set, HIDAM index, and any secondary index are protected by global block locks:
A level 3 private lock is obtained for the erase of a key sequenced data set record.
A level 4 private lock is obtained for the insertion or replacement of a KSDS record.
A level 6 private lock is obtained for a record insert resulting in a KSDS CI, or CA split.
High update activity to KSDSs
Updates to a KSDS require the busy lock for the data set. This lock is held only f ...
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