Richard A Carr

US Patent:

7246123, Jul 17, 2007

Filed:

Aug 6, 2001

Appl. No.:

10/343862

Inventors:

Richard W. Carr - Palo Alto CA, US
Barbara E. Schilling - Palo Alto CA, US
Johanne C. Corbeil - Mountain View CA, US
Harry P. Scott - Duxbury MA, US

Assignee:

Carr Scott Software Incorporated - Duxbury MA

International Classification:

G06F 17/30

US Classification:

707 10, 707101, 707102, 707103 Y, 7071041

Abstract:

In processing system that includes a processing element communicatively coupled to a storage system for storage of database files () managed by a database management system () having a transaction management facility (), file access operations from application processes are intercepted and checked to determine if the operation is from a non-transactional process, and if so, whether an automatic transaction should be started for the operation.

US Patent:

57404330, Apr 14, 1998

Filed:

Aug 28, 1996

Appl. No.:

8/704111

Inventors:

Richard W. Carr - Palo Alto CA
Brian Garrard - Speldhurst, GB2
Malcolm Mosher - Los Gatos CA

Assignee:

Tandem Computers, Inc. - Cupertino CA

International Classification:

G06F 1230

US Classification:

395618

Abstract:

A local computer system has a local database, application programs that modify the database and a transaction manager that stores audit records in a local audit trail reflecting the application programs' modifications to the local database. A remote computer system has a backup database. A remote data duplication facility (RDF) is distributed in the local computer system and the remote computer for maintaining synchronization of the backup database with the local database. The RDF has an extractor process and a receiver process. The extractor process has multiple updater processes, extracts audit records from the local audit trail and transmits them to the receiver process, which distributes them to the updater processes which in tuna initiate redo operations of database modifications in at least a subset of the audit records against the backup database. Should the audit records not arrive in proper sequence, the receiver transmits an error message to the extractor process, which extracts audit records from a restart audit trail position value.

US Patent:

58359150, Nov 10, 1998

Filed:

Dec 6, 1996

Appl. No.:

8/761725

Inventors:

Richard W. Carr - Palo Alto CA
Brian Garrard - Kent, GB2
Malcolm Mosher - Los Gatos CA

Assignee:

Tandem Computer - Cupertino CA

International Classification:

G06F 1730

US Classification:

707202

Abstract:

A local computer system has a local database, application programs that modify the local database, and a transaction manager that stores audit records in a local audit trail reflecting those application program modifications to the local database. Each audit record has an associated audit trail position. A remotely located computer system has a backup database. A remote data duplication facility (RDF) is partially located in the local computer system and partially in the remote computer for maintaining virtual synchronization of the backup database with the local database. The RDF includes an extractor process executed by said local computer system, and a receiver process and a plurality of updater processes executed by the remote computer system. The extractor process extracts audit records from the local audit trail and transmits those records to the receiver process. When the receiver process detects that it is receiving audit records not in accordance with a predefined sequence, it transmits an error message to the extractor process.

US Patent:

47180021, Jan 5, 1988

Filed:

Jun 5, 1985

Appl. No.:

6/741659

Inventors:

Richard W. Carr - Palo Alto CA

Assignee:

Tandem Computers Incorporated - Cupertino CA

International Classification:

G06F 1300

US Classification:

364200

Abstract:

An improved method for communicating updated information among processors in a distributed data processing system. The system includes a plurality of distributed interconnected processors each having a memory. The method includes the steps of prioritizing the processors into a predetermined order, establishing one of the processors as a control processor for the broadcast of update messages, developing an update message in at least one of the processors, selecting in accordance with the control processor one of the processors which has developed an update message as a sender processor, broadcasting the update message of the sender processor to each of the processors, and causing the next processor in order to be selected as control processor in the event that the former control processor fails in service. As one preferred use, the method enables the system to transmit atomic global update messages with a tolerance to multiple processor faults.