发明授权
- 专利标题: Storage control method for database recovery in logless mode
- 专利标题(中): 数据恢复存储控制方法
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申请号: US11396644申请日: 2006-04-04
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公开(公告)号: US07353335B2公开(公告)日: 2008-04-01
- 发明人: Nobuo Kawamura
- 申请人: Nobuo Kawamura
- 申请人地址: JP Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JP Tokyo
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2006-026676 20060203
- 主分类号: G06F17/30
- IPC分类号: G06F17/30 ; G06F3/06 ; G06F12/00
摘要:
The present invention is constituted so as to enable the recovery of a database even when a log comprising a DB update history is not created. When executing a transaction in the logless mode, a logless-start log is created and written to a primary log VOL 55A at the start of this transaction, and this logless-start log is also written to a secondary log VOL 55B. Thereafter, batch processing is carried out for a DB of a primary DB VOL 51A, and while this transaction is being executed, the pair-split state of the DB VOL is cancelled either prior to the start or after the end of the batch processing, and if the difference between the DB VOLs is eliminated subsequent to the end of batch processing, a logless-end log is created and written to the primary log VOL 55A, and this log is also written to the secondary log VOL 55B.