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    • 3. 发明授权
    • Fine-grain policy-based snapshots
    • 细粒度的基于策略的快照
    • US08352431B1
    • 2013-01-08
    • US12661894
    • 2010-03-25
    • Boris V. ProtopopovArkady KanevskyJurgen LeschnerRossen Dimitrov
    • Boris V. ProtopopovArkady KanevskyJurgen LeschnerRossen Dimitrov
    • G06F17/00
    • G06F17/30088G06F11/1446G06F11/2056G06F17/30082G06F2201/84
    • Providing a snapshot copy of data includes selectively collecting a plurality of data objects based on evaluation of a predicate associated with each of the data objects and performing a snapshot operation in connection with modifying at least one of the plurality of data objects. The snapshot operation may be performed prior to modifying the at least one of the plurality of data objects. The snapshot operation may be a copy on write operation. Providing a snapshot copy of data may also include providing a data structure that maintains a plurality of snapshot instances. The data structure may be a table. Each of the snapshot instances may include at least one of: an object set description, a timestamp indicating when the snapshot was initiated, a snapshot name and a handling policy.
    • 提供数据的快照副本包括基于与每个数据对象相关联的谓词的评估来选择性地收集多个数据对象,并且与修改多个数据对象中的至少一个数据对象相关联地执行快照操作。 可以在修改多个数据对象中的至少一个数据对象之前执行快照操作。 快照操作可以是写操作的复制。 提供数据的快照副本还可以包括提供维护多个快照实例的数据结构。 数据结构可以是表。 每个快照实例可以包括以下至少一个:对象集描述,指示何时启动快照的时间戳,快照名称和处理规则。