公开(公告)号：CA2167902A1

公开(公告)日：1996-07-25

申请号：CA2167902

申请日：1996-01-23

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W ,  GARRARD BRIAN ,  MOSHER MALCOLM JR

IPC: G06F11/14 ,  G06F11/20 ,  G06F17/30

Abstract: A local computer system has a local database, application programs thatmodify 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. A remotely located computer system has a backup database. A remote data duplication facility (RDF) maintains virtual synchronization of the backup database with the local database. The RDF includes an extractor process executed by the 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. The receiver distributes the received audit records to a plurality of image trail files in the remote computer system for processing by updater processes, which initiate redo operations of database modifications denoted in at least a subset of the audit records against the backup database. A catalog manager on the local computer system performs online database restructurings while application programs continue to modify the database. The transaction manager stores a Stop Updaters audit record in the local audit trail when each online database restructuring successfully completes. The extractor process transmits the Stop Updaters audit record to the remote computer system and the receiver process moves a copy each received Stop Updaters audit record into all of the image trails. Finally, each updater process stops execution when it reads a Stop Updaters audit record in its assigned image trail file.

公开(公告)号：AU570362B2

公开(公告)日：1988-03-10

申请号：AU5809886

申请日：1986-05-30

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F15/177 ,  G06F11/00 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：NO173474B

公开(公告)日：1993-09-06

申请号：NO862180

申请日：1986-06-02

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F11/00 ,  G06F11/18 ,  G06F15/177 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：MX164435B

公开(公告)日：1992-08-13

申请号：MX271586

申请日：1986-06-05

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F11/00 ,  G06F15/177 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173 ,  G06F13/18

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：AU5809886A

公开(公告)日：1986-12-11

申请号：AU5809886

申请日：1986-05-30

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F15/177 ,  G06F11/00 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：NO862180A

公开(公告)日：1986-12-08

申请号：NO862180

申请日：1986-06-02

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F15/177 ,  G06F11/00 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173 ,  G06F

CPC classification number: G06F15/161 ,  G06F11/20 ,  G06F11/2028 ,  G06F11/2041 ,  G06F11/2048 ,  G06F11/2097

公开(公告)号：CA1254303A

公开(公告)日：1989-05-16

申请号：CA510767

申请日：1986-06-04

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F15/177 ,  G06F11/00 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173 ,  G06F11/30

Abstract: METHOD FOR MULTIPROCESSOR COMMUNICATIONS An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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 falls in service. As one preferred use, the method enables the system to transmit atomic global update messages with a tolerance to multiple processor faults. TTTTT6/10577-23

公开(公告)号：NO862180D0

公开(公告)日：1986-06-02

申请号：NO862180

申请日：1986-06-02

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F11/00 ,  G06F15/177 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173 ,  G06F

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：NO173474C

公开(公告)日：1993-12-15

申请号：NO862180

申请日：1986-06-02

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F11/00 ,  G06F15/177 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.

公开(公告)号：DE3685609T2

公开(公告)日：1992-12-24

申请号：DE3685609

申请日：1986-05-14

Applicant: TANDEM COMPUTERS INC

Inventor： CARR RICHARD W

IPC: G06F15/177 ,  G06F11/00 ,  G06F11/18 ,  G06F11/20 ,  G06F15/16 ,  G06F15/173

Abstract: An improved method for communicating updated information among processors in a distributed data processing system is disclosed. 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.