Failover and recovery for replicated data instances

Details Failover and recovery for replicated data instances Failover and recovery for replicated data instances

2009-10-26

2011-12-06

Ehne, Charles (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S004100, C714S004120, C714S006100, C714S006200, C714S006310, C714S011000, C714S012000, C714S043000

Reexamination Certificate

active

08074107

ABSTRACT:
Replicated instances in a database environment provide for automatic failover and recovery. A monitoring component can periodically communicate with a primary and a secondary replica for an instance, with each capable of residing in a separate data zone or geographic location to provide a level of reliability and availability. A database running on the primary instance can have information synchronously replicated to the secondary replica at a block level, such that the primary and secondary replicas are in sync. In the event that the monitoring component is not able to communicate with one of the replicas, the monitoring component can attempt to determine whether those replicas can communicate with each other, as well as whether the replicas have the same data generation version. Depending on the state information, the monitoring component can automatically perform a recovery operation, such as to failover to the secondary replica or perform secondary replica recovery.

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