Data processing: database and file management or data structures – Database design – Data structure types
Reexamination Certificate
2006-11-22
2009-12-01
Fleurantin, Jean B. (Department: 2162)
Data processing: database and file management or data structures
Database design
Data structure types
C707S793000, C707S793000, C707S793000, C707S793000, C707S793000, C714S004110, C714S712000, C714S718000
Reexamination Certificate
active
07627584
ABSTRACT:
Techniques used in an automatic failover configuration having a primary database system, a standby database system, and an observer for preventing divergence among the primary and standby database systems while increasing the availability of the primary database system. In the automatic failover configuration, the primary database system remains available even in the absence of both the standby and the observer as long as the standby and the observer become absent sequentially. The failover configuration further permits automatic failover only when the observer is present and the standby and the primary are synchronized and inhibits state changes during failover. The database systems and the observer have copies of failover configuration state and the techniques include techniques for propagating the most recent version of the state among the databases and the observer and techniques for using carefully-ordered writes to ensure that state changes are propagated in a fashion which prevents divergence.
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Girkar Mahesh Baburao
Guzman Raymond
McGuirk Robert R.
Fleurantin Jean B.
Ly Anh
Nelson Gordon E.
Oracle International Corporation
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