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

G - Physics – 06 – F

Patent

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

Patent

CA 2320240

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 the resource.

L'invention concerne un procédé et un appareil de transfert d'une ressource de la mémoire cache d'un serveur de base de données à la mémoire cache d'un autre serveur de base de données sans écriture préalable de la ressource sur un disque. Lorsqu'un serveur de base de données (Demandeur) souhaite modifier une ressource, le Demandeur demande une version courante de la ressource. Le serveur de base de données détenant la version courante (Détenteur) expédie directement la version courante au Demandeur. En expédiant la version, le Détenteur perd la possibilité de modifier la ressource, mais continue de garder la ressource en mémoire. Lorsque la version gardée de la ressource, ou une version ultérieure, est écrite sur un disque, le Détenteur peut supprimer la version gardée de la ressource. Autrement, le Détenteur ne supprime pas la version gardée. Grâce à cette technique, on peut rattraper les défaillances de serveur unique sans devoir fusionner les journaux de reprise des multiples serveurs de base de données qui avaient accès à la ressource.

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