International Business Machines Corporation

Barry Warren Knapp

Thomas Paul Giordano

David Rolland Welsh

Robert J Bestgen

Robert Paul Mech

A method and computer program product are provided for processing and combining data sets including bitmaps in a computer system. A plurality of initial data subsets to be combined are processed and data structure statistics containing predefined data attributes are built for each of the plurality of initial subsets. Checking for a dynamic selection attribute for each of the plurality of initial subsets is performed. Responsive to the dynamic selection attribute not being identified, the intermediate storage requirements for producing the combined final data set is selectively optimized. Responsive to identifying the dynamic selection attribute, both intermediate result regeneration and intermediate storage requirements for producing a combined final data set are selectively optimized.

Method and computer program product for processing and combining data sets including bitmaps

A method and computer program product are provided for paging control using a reference structure in a computer system. The reference structure is scanned to identify a next selected entry for an IO range building routine. The next selected entry is compared with a set hardlimit value. Responsive to the next selected entry being greater than the hardlimit value, the IO range building routine is exited. A shortlimit value is identified. The next selected entry is compared with the identified shortlimit value. Responsive to the next selected entry being greater than the identified shortlimit value, the IO range building routine is exited. A first array is used for storing entry IDs for selected entries found from scanning the reference structure and a second array is used for tracking blocks of storage used for the selected entries.

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Rochester, MN, United States of America

Barry Warren Knapp