Invention Grant
- Patent Title: Method and apparatus for data rollback
- Patent Title (中): 数据回滚的方法和装置
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Application No.: US11649180Application Date: 2007-01-03
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Publication No.: US08880480B2Publication Date: 2014-11-04
- Inventor: Joydip Kundu , Archie W. Brown , Douglas A. Voss , Qinqin Wang
- Applicant: Joydip Kundu , Archie W. Brown , Douglas A. Voss , Qinqin Wang
- Applicant Address: US CA Redwood Shores
- Assignee: Oracle International Corporation
- Current Assignee: Oracle International Corporation
- Current Assignee Address: US CA Redwood Shores
- Agency: Kraguljac Law Group, LLC
- Main IPC: G06F17/30
- IPC: G06F17/30 ; G06F11/14 ; G06F11/16

Abstract:
A database rollback processor allows rollback, or rewind, of the data and metadata to a point at which a failover or other metadata change occurred, therefore “rewinding” the metadata to a previous consistent point. The rollback processor identifies transaction entries in a redo log resulting in changes to the metadata. The changes are identified backward to a target recovery time. Transactions affecting the metadata are stored in a stack. The transactions are then backed out of the metadata according to the stack to restore the metadata to the state at the target recovery time. Data changes from the redo log may then be applied to the corresponding metadata as it existed at the target recovery time. Since the target recovery time is not bound by the timing of the snapshots, but rather may be at an arbitrary point chosen as the target recovery time, a failover, replication or recovery operation need not rely on the snapshot time.
Public/Granted literature
- US20080162590A1 Method and apparatus for data rollback Public/Granted day:2008-07-03
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