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    • 76. 发明授权
    • Method and apparatus for asynchronous version advancement in a three version database
    • 三版本数据库中异步版本升级的方法和装置
    • US06351753B1
    • 2002-02-26
    • US09252805
    • 1999-02-19
    • Hosagrahar V. JagadishInderpal S. MumickMichael Rabinovich
    • Hosagrahar V. JagadishInderpal S. MumickMichael Rabinovich
    • G06F1730
    • G06F17/30356Y10S707/99953Y10S707/99954
    • A method and apparatus is provided for asynchronous version advancement in a three version database. For a distributed database, read transactions are executed using a first version of a database. Update transactions are executed such that information is written into a second version of the database. The second version may include less than all of the information contained in the first version. A database version begins to be advanced at each node such that the information in the second version becomes available for read transactions. For an update transaction that starts on a node after the database version has been advanced, the update transaction is executed such that the update transaction writes information into a third version of the database. The advancement of the database version is completed such that the second version becomes the first version and the third version becomes the second version. For a centralized database, the protocol reduces of the number of versions from four to three.
    • 提供了一种用于三版本数据库中的异步版本提升的方法和装置。 对于分布式数据库,使用第一版数据库执行读取事务。 执行更新事务,使得信息被写入数据库的第二版本。 第二个版本可能包含少于第一个版本中包含的所有信息。 数据库版本在每个节点开始被提升,使得第二个版本中的信息可用于读取事务。 对于在数据库版本升级后在节点上启动的更新事务,执行更新事务,以便更新事务将信息写入数据库的第三个版本。 完成数据库版本的推进,使得第二版本成为第一个版本,第三个版本成为第二个版本。 对于集中式数据库,该协议将版本数量从4个减少到3个。