Remote duplicate database facility with improved throughput and

Details Remote duplicate database facility with improved throughput and Remote duplicate database facility with improved throughput and

1996-08-28

1998-04-14

Lintz, Paul R.

395617, 395620, 39518214, G06F 1230

Patent

active

057404330

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.

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Guerrero, Jorge, "RDF: An Overview", Tandem Systems Review, Oct. 1991, pp. 34-43.
Senf, Wouter, et al., "RDF Synchronization", Tandem Systems Overview, Summer 1992, pp. 6-23.

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