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    • 5. 发明申请
    • Concurrently Accessing Data
    • 同时访问数据
    • US20110282850A1
    • 2011-11-17
    • US12777272
    • 2010-05-11
    • Vaibhav KamraPradeep MadhavarapuCristian DiaconuJun FangSrini AcharyaMichael WarmingtonMaciej PlazaArtem OksSankhyayan Debnath
    • Vaibhav KamraPradeep MadhavarapuCristian DiaconuJun FangSrini AcharyaMichael WarmingtonMaciej PlazaArtem OksSankhyayan Debnath
    • G06F17/30
    • G06F16/2343G06F16/1774
    • A database management system having a database component, which includes a lock manager, and a filesystem component. The filesystem component is configured to: generate a mapping between one or more filesystem access modes, one or more filesystem sharing modes and one or more database locks, receive a request from a filesystem stack to perform one or more actions on data in a database, identify a filesystem access mode and a filesystem share mode of the request, determine which one of the database locks corresponds to the filesystem access mode and the filesystem share mode of the request based on the mapping, and receive a notification lock on the data from the lock manager when no other database locks conflict with the notification lock, wherein the notification lock corresponds to the one of the database locks. After receiving the notification lock on the data, the lock manager is configured to send a notification to the filesystem component when a subsequent request from a database stack includes accessing the data.
    • 具有包括锁管理器和文件系统组件的数据库组件的数据库管理系统。 所述文件系统组件被配置为:生成一个或多个文件系统访问模式,一个或多个文件系统共享模式和一个或多个数据库锁之间的映射,从文件系统栈接收对数据库中的数据执行一个或多个动作的请求, 识别请求的文件系统访问模式和文件系统共享模式,基于映射确定数据库锁中的哪一个对应于文件系统访问模式和请求的文件系统共享模式,并且接收来自 当没有其他数据库锁与通知锁冲突时,锁管理器,其中通知锁对应于数据库锁之一。 在收到关于数据的通知锁定之后,锁管理器被配置为当来自数据库堆栈的后续请求包括访问数据时向文件系统组件发送通知。