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    • 24. 发明授权
    • Failure transparency for update applications under single-master configuration
    • 在单主机配置下的更新应用程序的故障透明度
    • US07600149B2
    • 2009-10-06
    • US11231204
    • 2005-09-20
    • Bruce G. LindsayInderpal S. NarangVijayshankar Raman
    • Bruce G. LindsayInderpal S. NarangVijayshankar Raman
    • G06F11/00
    • G06F11/1482
    • A method masking data failures, when a master copy of data is unavailable comprises storing a single master copy of data and a replica copy of the data; writing to the master using a middleware component; and reading from either the master or the replica using the middleware component, when the master copy is unavailable. When the master is unavailable, the writes are stored in a table located in the middleware component as stored write requests, in which the stored write requests comprise UDI's to be made to the master. The reads are also performed from the table and the replica when the master is unavailable. When the master becomes available, the stored write requests are propagated to the master. Thus, the middleware allows the writes to run during times when the master is unavailable.
    • 当数据的主副本不可用时,屏蔽数据故障的方法包括存储数据的单个主副本和数据的副本副本; 使用中间件组件向主人写信; 并且当主副本不可用时,使用中间件组件从主控或副本读取。 当主机不可用时,写入存储在位于中间件组件中的表中作为存储的写入请求,其中所存储的写入请求包括将要写入主机的UDI。 当主机不可用时,也从表和副本执行读取。 当主机可用时,存储的写入请求被传播到主机。 因此,中间件允许写入在主机不可用的时间内运行。
    • 25. 发明授权
    • System and method for asynchronous data replication without persistence for distributed computing
    • 异步数据复制的系统和方法,无需持续分布式计算
    • US07287043B2
    • 2007-10-23
    • US10645221
    • 2003-08-21
    • Bruce G. LindsayInderpal S. NarangVijayshankar Raman
    • Bruce G. LindsayInderpal S. NarangVijayshankar Raman
    • G06F7/00G06F17/30
    • G06F17/30578
    • A system and method of lightweight asynchronous data replication that avoids the need for any persistent store at the replication source or communication channel, and is independent of the underlying data formats, wherein the method of data replication comprises replicating deltas from a source, embedding replication tracking information in the replicated deltas, wherein the tracking information comprises a timestamp and a sequence number, and applying deltas at a target. The tracking information is used to ensure that each delta is applied exactly once. In the event of a crash in the system, the target analyzes the tracking information to determine which deltas have been applied, and requests retransmission of replicated data from the source starting from the earliest unapplied delta. The source and target are treated as only delta producers and consumers, and as such the invention is applicable to replication between arbitrary data source formats.
    • 轻量级异步数据复制的系统和方法,避免了复制源或通信通道上任何持久存储的需要,并且独立于底层数据格式,其中数据复制的方法包括从源复制三角形,嵌入复制跟踪 复制三角形中的信息,其中所述跟踪信息包括时间戳和序列号,以及在目标上应用三角形。 跟踪信息用于确保每个增量都应用一次。 在系统崩溃的情况下,目标分析跟踪信息以确定已应用哪些增量,并且从最早未应用的增量开始从源发送重传数据。 源和目标仅被视为增量生成器和消费者,因此本发明适用于任意数据源格式之间的复制。
    • 27. 发明授权
    • Method for refreshing multicolumn tables in a relational data base using
minimal information
    • 使用最少信息在关系数据库中刷新多列表的方法
    • US4631673A
    • 1986-12-23
    • US693500
    • 1985-01-22
    • Laura M. HaasBruce G. Lindsay
    • Laura M. HaasBruce G. Lindsay
    • G06F12/00G06F7/22G06F17/30G06F15/20
    • G06F17/30595Y10S707/99939Y10S707/99952
    • A method for refreshing a relational data base snapshot manifest in the form of remote read-only copies of selected portions of a base table. The method takes advantage of the fact that each tuple of the base table has a unique identifier TID associated therewith from the time the record is inserted until it is deleted. The TID references the physical location of the tuple within its relation. Two system-maintained fields are added to the base table. These are PREVTID and update ID. One system-maintained column is required in the snapshot table, i.e. BASE TID. Lastly, a column in the catalog of the snapshot is also maintained, i.e. SNAPHIGH.When the refresh of the snapshot table is required, a single scan of the base relation, in ascending TID sequence, is performed on the base table. The scan produces a series of messages which contain the incremental changes required to update the snapshot table to the current state of the base relation. Upon receipt of the messages at the snapshot table site, a single skip sequential pass across the snapshot in BASE TID sequence is performed to apply the incremental changes. This refreshes the snapshot table to the required state.
    • 用于以基表的所选部分的远程只读副本的形式刷新关系数据库快照清单的方法。 该方法利用了从插入记录直到被删除的时间之后,基表的每个元组具有与其相关联的唯一标识符TID的事实。 TID在其关系中引用元组的物理位置。 两个系统维护的字段被添加到基表中。 这些是PREVTID和更新ID。 快照表中需要一个系统维护的列,即BASE TID。 最后,还保留快照目录中的列,即SNAPHIGH。 当需要刷新快照表时,在基表上执行以升序TID序列的基本关系的单次扫描。 扫描产生一系列消息,其中包含将快照表更新为基本关系的当前状态所需的增量更改。 在快照表站点接收到消息后,将执行BASE TID序列中快照的单次跳过顺序,以应用增量更改。 将快照表刷新到所需状态。