February 2003
Intermediate to advanced
360 pages
11h 25m
English
book
Moving Data Across the DB2 Family
by Paolo Bruni, Michael Ho, Marko Milek, Arne Nilsen, Jose Mari Michael Sanchez
Content preview from Moving Data Across the DB2 Family
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Chapter 7. IBM DB2 High Performance Unload for z/OS 121
7.1.2 Strong points of HPU
There are the things HPU does to make it stand up to its name. To maximize performance,
HPU uses buffering and synchronization techniques:
Buffering When reading data rows, HPU directly accesses the VSAM clusters
containing the table space.This direct use of VSAM takes maximum
advantage of VSAM’s buffering capability, which lets an entire cylinder
be read with a single I/O.
Synchronization HPU permits the parallel execution of several unloads that are
accessing the same table space; it does this by synchronizing the
unloads. Each row extracted from a table space is offered
successively to each of the unloads executed under HPU control, so
that a single read satisfies ...
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