Patent ID: 9563521
Date: 2017-02-07
CPC Classifications: G06F

Claim:
1. A method comprising: receiving, at a first node in a cluster of nodes of a database system, from a second node in the cluster of nodes, a request for first data that the first node has modified; wherein each node in the cluster of nodes executes one or more database server instances; prior to the first node durably storing redo data that indicates one or more changes that have been made to the first data, sending, from the first node, to the second node in the cluster of nodes, the first data that includes the one or more changes; wherein sending the first data comprises sending timestamp data that indicates when the redo data was generated at the first node; wherein sending the timestamp data to the second node comprises sending, to the second node, a plurality of timestamp values; wherein each timestamp value of the plurality of timestamp values indicates when certain redo data, upon which the first data depends, was generated by a different respective instance of a plurality of instances in the cluster of nodes; wherein the method is performed by one or more computing devices.