International Business Machines Corporation

Trevor A Geisler

David C Reed

Max D Smith

Thomas C Reed

A method for enabling data set changes to be reverted to a prior point in time or state is disclosed. In one embodiment, such a method includes providing a data set comprising one or more data elements and a specified number of generations of the data elements. In certain embodiments, the data set is a partitioned data set extended (PDSE) data set, and the data elements are 'members' within the PDSE data set. The method further includes tracking changes made by a job to data elements of the data set. The method further references, in a data structure (also referred to herein as a 'cluster') associated with the job, previous generations of the data elements changed by the job. In certain embodiments, the data structure is stored in the data set. A corresponding system and computer program product are also disclosed.

PDSE member generation clustering and recovery

A method for dynamically modifying data set generation depth is disclosed herein. In one embodiment, such a method includes providing a data set comprising one or more data elements. For each data element, a maximum generations number is designated that specifies a maximum number of generations of the data element to retain in the data set. The method monitors an access rate (e.g., creation rate, update rate, etc.) for each data element and dynamically alters, for each data element, the maximum generations number in accordance with the data element's access rate. In certain embodiments, the maximum generations number of a data element is increased as its access rate increases. Similarly, the maximum generations number of a data element may be decreased as its access rate decreases. A corresponding system and computer program product are also disclosed.

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Tucson, AZ, United States of America

Trevor A Geisler