发明授权
- 专利标题: Guaranteed undo retention
- 专利标题(中): 保证撤销保留
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申请号: US10920874申请日: 2004-08-17
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公开(公告)号: US07437525B2公开(公告)日: 2008-10-14
- 发明人: Wanli Yang , Bipul Sinha , Amit Ganesh
- 申请人: Wanli Yang , Bipul Sinha , Amit Ganesh
- 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 Palermo Truong & Becker LLP
- 主分类号: G06F12/16
- IPC分类号: G06F12/16
摘要:
Techniques are provided for guaranteed undo retention. The techniques include a database server attempting to store undo information in undo storage. In order to store the undo information, the database server may overwrite expired undo records; write to empty undo extents; allocate new undo extents and write to the newly-allocated extents; or overwrite unexpired undo records that do not have guaranteed undo retention. If an undo record does not have guaranteed undo retention, then the undo record may be overwritten before the expiration time has elapsed. If no undo extent is empty or unallocated, and if all of the undo records are unexpired and have guaranteed undo retention, then the database system has, at least temporarily, run out of usable and reusable space and an error may be reported to an appropriate party.
公开/授权文献
- US20050015563A1 Guaranteed undo retention 公开/授权日:2005-01-20
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