Importance

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Abstract

A method and apparatus for removing changes made by a dead transaction is provided. According to the method, a first change is performed by the dead transaction prior to a second change. The first change made by the dead transaction is then undone prior to undoing the second change made by the dead transaction. According to another aspect of the invention, a method and apparatus for applying changes in redo records to make a particular resource reflect changes made to the particular resource in volatile memory before a failure is provided. The method includes establishing links that link together a set of redo records that contain changes made to the particular resource. The links are then followed to apply the changes contained in the set of redo records to cause the particular resource to reflect the changes made to the particular resource in volatile memory before the failure. According to another aspect of the invention, a method and apparatus for applying changes in two or more redo records in parallel is provided. According to the method, a plurality of resources are locked by a dead transaction. A plurality of sets of redo records are established that do not contain any redo records that depend on any redo records in any other set of redo records. The plurality of sets of redo records are applied in parallel relative to one another.

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First Claim