Method and apparatus for transferring data from the cache of...

Details Method and apparatus for transferring data from the cache of... Method and apparatus for transferring data from the cache of...

G - Physics

06

F

G06F 11/14 (2006.01) G06F 12/02 (2006.01) G06F 15/16 (2006.01)

Patent

CA 2448050

A method and apparatus are provided for transferring a resource from the cache of one database server to the cache of another database server without first writing the resource to disk. When a database server (Requestor) desires to modify a resource, the Requestor asks for the current version of the resource. The database server that has the current version (Holder) directly ships the current version to the Requestor. Upon shipping the version, the Holder loses permission to modify the resource, but continues to retain the resource in memory. When the retained version of the resource, or a later version thereof, is written to disk, the Holder can discard the retained version of the resource. Otherwise, the Holder does not discard the retained version. Using this technique, single-server failures are recovered without having to merge the recovery logs of the various database servers that had access to resource.

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