William R Cunningham

US Patent:

7024420, Apr 4, 2006

Filed:

Apr 30, 2002

Appl. No.:

10/135652

Inventors:

Linda S. Ball - Austin TX, US
William R. Cunningham - Austin TX, US
Stanley James Dee - Austin TX, US
Thomas G. Price - Austin TX, US

Assignee:

BMC Software, Inc. - Houston TX

International Classification:

G06F 17/30

US Classification:

707102, 707101

Abstract:

Techniques to provide run-time access to a database image through a target database management system (DBMS) are described. An empty database in the target DBMS (the “target database”) is created having substantially the same schema as the database image. At run-time, queries directed to the target database are intercepted and redirected to the database image. Information returned in response to the redirected query is modified so that internal database identifiers retrieved from the database image are replaced with like database identifiers associated with the target database management system. Thus, run-time access to database image content is provided without the need to load the database image's data content into a target database.

US Patent:

56642172, Sep 2, 1997

Filed:

Aug 3, 1993

Appl. No.:

8/102084

Inventors:

William Russell Cunningham - Austin TX
Michael Laurie Perry - Austin TX

Assignee:

BMC Software, Inc. - Houston TX

International Classification:

H01J 300

US Classification:

395821

Abstract:

A method of caching I/O requests permits caching in the MVS environment independent of the access method protocol used to initiate an I/O request (e. g. , QSAM, VSAM, Media Manager). In addition, objects can be user-prioritized for residence in the cache.

US Patent:

52222357, Jun 22, 1993

Filed:

Feb 1, 1990

Appl. No.:

7/473663

Inventors:

Thomas E. Hintz - Austin TX
William R. Cunningham - Austin TX

Assignee:

BMC Software, Inc. - Sugar Land TX

International Classification:

G06F 300
G06F 700
G06F 938

US Classification:

395600

Abstract:

The reorganization method of DB2 data files explores parallel processing, and asynchronous I/O to a great extent. It includes means to estimate an optimum configuration of system resources, such as storage devices (DASD devices), memory, and CPUs, etc, during reorganizations. The method mainly consists of four components, (1) concurrent indexing, (2) concurrent unloading of data file partitions, (3) efficient reloading of DB2 data pages and DB2 space maps, and (4) means to reduce access constraints to the DB2 recovery table.

US Patent:

62021362, Mar 13, 2001

Filed:

Feb 27, 1997

Appl. No.:

8/807313

Inventors:

Shawn B. Wikle - Austin TX
William R. Cunningham - Austin TX
Carla C. Birk - Austin TX
Linda S. Ball - Austin TX

Assignee:

BMC Software, Inc. - Houston TX

International Classification:

G06F 1216

US Classification:

711162

Abstract:

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.