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It is recognized that XML, which is widely adopted across industries for its flexibility and portability, is nonetheless verbose and its manipulations incur more overhead than its relational counterparts. Even though z/OS XML System Services is an efficient system level XML parser on z/OS, additional general CPU cost reduction is possible. With the proper software and hardware, local DB2 calls to z/OS XML System Services are redirected to a IBM System z Application Assist Processor (zAAP) specialty engine. Included are invocations from the attachments that run in TCB mode. DB2 already has functions that can be redirected to the System z Integrated Information Processor (zIIP) specialty engine.
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