Bmc Software, Inc.

Shawn B Wikle

Linda S Ball

William R Cunningham

Carla C Birk

A computer program operating in accordance with the invention monitors WRITE requests issued by a data-writing program that accesses data sets, e.g., for updating the data sets, and READ requests issued by a data-reading program that accesses data sets, e.g., for copying the data. While a series of READ requests (e.g., a data set copying operation) is in progress, the computer program monitors all WRITE requests issued for the data set in question by the data-writing program. If the data-reading program has not yet read the data portion (e.g., a data page) that is to be updated, the computer program selectively creates a cached image of the data portion as it existed at the beginning of the series of READ requests and delivers the cached image to the data-reading program, thereby reducing the potential for internal inconsistencies in the copied data. The computer program advantageously permits such caching to be performed without the need for specialized caching hardware.

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Austin, TX, United States of America

Shawn B Wikle