Amrish Srivastava from 7003 Emerson Ln, San Ramon, CA 94582, age 54, Phone: (925)5569265

Amrish Srivastava Phones & Addresses

Distributed Systems

Information Technology And Services

Time-Based Checkpoint Target For Database Media Recovery
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US Patent:

20150317212, Nov 5, 2015
Filed:

May 5, 2014
Appl. No.:

14/270117
Inventors:

- Redwood Shores CA, US
Yunrui Li - Fremont CA, US
Mahesh Baburao Girkar - Cupertino CA, US
Amrish Srivastava - San Ramon CA, US
International Classification:

G06F 11/14
Abstract:

A method, apparatus, and system for a time-based checkpoint target is provided for standby databases. Change records received from a primary database are applied for a standby database, creating dirty buffer queues. As the change records are applied, a mapping is maintained, which maps timestamps to logical times of change records that were most recently applied at the timestamp for the standby database. On a periodic dirty buffer queue processing interval, the mapping is used to determine a target logical time that is mapped to a target timestamp that is prior to a present timestamp by at least a checkpoint delay. The dirty buffer queues are then processed up to the target logical time, creating an incremental checkpoint. On a periodic header update interval, file headers reflecting a consistent logical time for the checkpoint are also updated. The intervals and the checkpoint delay are adjustable by user or application.