- 专利标题: Time-based checkpoint target for database media recovery
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申请号: US16215046申请日: 2018-12-10
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公开(公告)号: US11048599B2公开(公告)日: 2021-06-29
- 发明人: Jonghyun Lee , Yunrui Li , Mahesh Baburao Girkar , Amrish Srivastava
- 申请人: Oracle International Corporation
- 申请人地址: US CA Redwood Shores
- 专利权人: Oracle International Corporation
- 当前专利权人: Oracle International Corporation
- 当前专利权人地址: US CA Redwood Shores
- 代理机构: Hickman Becker Bingham Ledesma LLP
- 主分类号: G06F16/00
- IPC分类号: G06F16/00 ; G06F11/00 ; G06F11/20 ; G06F11/14 ; G06F16/10 ; G06F16/23
摘要:
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.
公开/授权文献
- US20190108107A1 TIME-BASED CHECKPOINT TARGET FOR DATABASE MEDIA RECOVERY 公开/授权日:2019-04-11
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