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    • 10. 发明授权
    • Method for providing session consistency guarantees
    • 提供会话一致性保证的方法
    • US5581753A
    • 1996-12-03
    • US314971
    • 1994-09-28
    • Douglas B. TerryAlan J. DemersKarin PetersenMichael J. SpreitzerMarvin M. TheimerBrent B. Welch
    • Douglas B. TerryAlan J. DemersKarin PetersenMichael J. SpreitzerMarvin M. TheimerBrent B. Welch
    • G06F12/00G06F11/14G06F13/00G06F17/30
    • G06F17/30371G06F11/1402Y10S707/99952
    • The present invention provides client-selected consistency guarantees to clients of a weakly consistent replicated database on a per "session" basis. The clients have access to utilities which allow the clients to, individually or collectively, define a "session" over which the selected guarantees are enforced. A "session" is broadly defined as a sequence of logically related Reads and Writes to the database. Sessions are initiated and terminated substantially independently of other sessions which may exist concurrently. Clients are allowed, however, to clone sessions and/or merge sessions with other clients. Clients select a minimum relevant subset of guarantees from among a set of pre-defined consistency guarantees, where "relevancy" is a client determined factor. At any given time, the system may be enforcing a number of different combinations of consistency guarantees. The guarantees ensure that all clients participating in a particular session view the database as having certain conditions of data consistency--the consistency of which is only provided with respect to the participants' Read and Write requests. Clients are allowed to downgrade their selected guarantees during the course of their sessions. One implementation of the present invention permits the selection of any one of four consistency guarantees.
    • 本发明在每个“会话”的基础上向弱一致的复制数据库的客户端提供客户选择的一致性保证。 客户可以访问实用程序,这些实用程序允许客户单独或集体定义执行所选保证的“会话”。 “会话”被广泛地定义为数据库的逻辑相关的读取和写入序列。 会话的启动和终止基本上独立于可能同时存在的其他会话。 但是,允许客户端克隆会话和/或与其他客户端合并会话。 客户从一组预定义的一致性保证中选择最小相关的担保子集,其中“相关性”是客户确定的因素。 在任何给定的时间,系统可能会执行许多不一致性保证的组合。 保证确保参与特定会话的所有客户都将数据库视为具有某些数据一致性的条件 - 其一致性仅针对参与者的读取和写入请求提供。 允许客户在会议过程中降级其选定的担保。 本发明的一个实现允许选择四个一致性保证中的任何一个。