Hewlett-Packard Development Company, L.p.

Compaq Computer Corporation, Inc.

Tandem Computers Incorporated

Yu-Cheung Cheung

William J Carley

Sitaram V Lanka

Charles Stuart Johnson

Albert C Gondi

Trina R Wisler

David J Wisler

Charles W Johnson

David Wisler

A Registration protocol is used in transaction processing for normal operations. If an error occurs, the system reverts to a Full Broadcast protocol. The Registration Protocol reduces the number of messages that are sent among CPUs in a cluster thereby permitting performance improvements in the system. The Registration Protocol has Begin, DPCheck, PhaseFlush and Phase(lock release) phases just as does the Full Broadcast Protocol, thereby permitting the Full Broadcast protocol to step in at any phase after an error is detected.

Hybrid method for flushing transaction state in a fault-tolerant clustered database

A symmetrical processing system includes a number of processor units sharing a memory element. At least a portion of the memory element is partitioned so that separate memory partitions are made exclusively available to some if not all the processor units.

Partitioning memory shared by multiple processors of a distributed processing system

A computing system comprising a number of multiple processor unit nodes interconnectively connected by a communications system to form a cluster is initialized in a manner that creates separate, independent execution environments for each processor unit. Each multiple processor unit node is configured to operate as a symmetric multiprocessing system with a single, shared memory. During a Startup procedure, memory area segments are created for each processor unit, providing processes running on that processor unit with mutually exclusive access to the associated memory area segment. Startup determines an order of the nodes of the cluster system, and establishes a Coordinator process in the lowest numbered processor unit in the first node of the order. The Coordinator process, when created, directs the remainder of the Startup procedure, and constructs a succession list that identifies the next processor unit in the order to take over the Coordinator process should the first fail.

Method for sequential and consistent startup and/or reload of multiple

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Yu-Cheung Cheung