Hewlett-packard Development Company, L.P.

Oracle International Corporation

Mark H Johnson

Ronald Obermarck

Michael D Derocher

Holger Hampf

Sam Lucente

Shizunori S Kobara

Tim Chuang

Peter Falt

Hector Santos

Andre′ De Salis

Jayson Pegler

Thomas G Magorka

Sarah Rosenbach

Printer

This invention discloses a highly accurate and efficient means to identify a failing component in a network with a minimum of testing. Developed to Support the Compaq Computer ServerNet&reg; system area LAN technology, the methods and apparatus disclosed can be applied to any LAN based system with routing tables that are fixed and known for the duration of the testing. Disclosed new methods include a means to determine a minimal set of tests, a means to use global statistics to identify the most likely failing component, and a further means to refine the failing component list. This invention was reduced to practice.

Network component failure identification with minimal testing

A method and apparatus for reapplying changes to a database is disclosed. A recovery log is provided for recording all changes applied to the database so that the changes may be reapplied to the database during database recovery. Whenever a change is written to a storage device, the recovery log is updated to indicate that the particular change has been written to the storage device. During recovery, the data in the recovery log is sorted by file ID, data block ID, record type and version ID.

Method and apparatus for reapplying changes to a database

A method and apparatus for reapplying changes to a database uses a recovery log for recording all changes applied to the database so that the changes may be reapplied to the database during database recovery. Whenever a change is written to a storage device, the recovery log is updated to indicate that the particular change has been written to the storage device. During recovery, the data in the recovery log is sorted by file ID, data block ID, record type and version ID.

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Los Gatos, CA, United States of America

Mark H Johnson