Parallel recovery by non-failed nodes

Details Parallel recovery by non-failed nodes Parallel recovery by non-failed nodes

G - Physics

06

F

G06F 11/20 (2006.01) G06F 9/46 (2006.01)

Patent

CA 2532048

Various techniques are described for improving the performance of a shared- nothing database system in which at least two of the nodes that are running the shared-nothing database system have shared access to a disk. Specifically, techniques are provided for recovering the data owned by a failed node using multiple recovery nodes operating in parallel. The data owned by a failed node is reassigned to recovery nodes that have access to the shared disk on which the data resides. The recovery logs of the failed node are read by the recovery nodes, or by a coordinator process that distributes the recovery tasks to the recovery nodes.

L'invention concerne des techniques variées pour améliorer la performance d'un système de base de données à partage zéro, dans lequel au moins deux noeuds d'exécution du système de base de données à partage zéro disposent d'un accès partagé à un disque. En particulier, l'invention concerne des techniques permettant de récupérer les données appartenant à un noeud défaillant, en faisant appel à plusieurs noeuds de récupération fonctionnant en parallèle. Les données de ce noeud défaillant sont réattribuées à des noeuds de récupération disposant d'un accès au disque partagé sur lequel se trouvent les données. Les journaux de récupération du noeud défaillant sont lus par les noeuds de récupération, ou par un procédé coordinateur qui distribue les tâches de récupération au noeud de récupération.

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