System and method for stopping updates at a specified timestamp

Details System and method for stopping updates at a specified timestamp System and method for stopping updates at a specified timestamp

1997-01-30

1998-08-25

Lintz, Paul R.

Data processing: database and file management or data structures

Database design

Data structure types

707201, 707204, 39518214, G06F 1730

Patent

active

057993220

ABSTRACT:
A primary computer system has a 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. A plurality of parallel backup systems are used to provide "triple contingency protection" of the data on the primary computer system. However, if the primary system suffers a sudden catastrophic failure, the parallel backup systems will generally be left in inconsistent states. To restart the application programs on one of the backup system, the parallel backup are first synchronized with each other, and then transaction processing is restarted with one of the backup systems as the new primary system, and the other backup systems as the backups to the new primary system. In addition, in order to enable any single backup system's database to be brought into a self consistent state, backup volume Updaters are stopped after database updates for all transactions committed on the primary system before a specified time have been completely applied to the backup system's database. After any reports requiring a self consistent database have been generated, operation of the Updaters is resumed.

REFERENCES:
patent: 5740433 (1998-04-01), Carr et al.
Jorge Guerrero, "RDF: An Overview", Tandem Systems Review, Oct. 1991, pp. 34-43.
Wouter Senf, et al., "RDF Synchronization", Tandem Systems Review, Summer 1992, pp. 6-23.

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