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    • 5. 发明授权
    • Method and system for controlling recovery downtime
    • 控制恢复停机时间的方法和系统
    • US06351754B1
    • 2002-02-26
    • US09103630
    • 1998-06-23
    • William H. Bridge, Jr.Boris KlotsJuan R. LoaizaAshok Joshi
    • William H. Bridge, Jr.Boris KlotsJuan R. LoaizaAshok Joshi
    • G06F1730
    • G06F11/1461G06F11/1471G06F2201/80Y10S707/99938Y10S707/99953
    • A method and system for reducing overhead associated with recovering after a failure. According to the method, a checkpoint value is maintained that indicates which records of a plurality of records have to be processed after the failure. The plurality of records contain change information that corresponds to a plurality of data blocks. A target checkpoint value is determined based on a desired number of data block reads that will be required during a redo phase of recovery. Changes contained in volatile memory are then written to nonvolatile memory to advance the checkpoint value to at least the target checkpoint value. According to another aspect of the invention, the target checkpoint value is determined using a circular queue of offset buckets. The offset buckets are used to store index values that are associated with buffers in the ordered list. The target checkpoint value is periodically set equal to an index value that is contained in an offset bucket. According to another aspect of the invention, the target checkpoint value is determined by calculating a maximum number of records that should be processed after the failure. The maximum number of records is based on the desired number of data block reads that will be required during the redo phase of the recovery. The target checkpoint value is updated based on the maximum number of records.
    • 一种降低与故障恢复相关的开销的方法和系统。 根据该方法,维护检查点值,其指示在故障之后必须处理多个记录的哪些记录。 多个记录包含对应于多个数据块的改变信息。 基于在恢复的重做阶段将需要的数据块读取的期望数目来确定目标检查点值。 随后将易失性存储器中的变更写入非易失性存储器,将检查点值提升至至少目标检查点值。 根据本发明的另一方面,使用偏移桶的圆形队列来确定目标检查点值。 偏移量桶用于存储与排序列表中的缓冲区相关联的索引值。 目标检查点值周期性设置为等于包含在偏移量桶中的索引值。 根据本发明的另一方面,通过计算在故障之后应该处理的最大记录数来确定目标检查点值。 记录的最大数量是基于恢复重做阶段所需要的数据块读取所需的数量。 基于记录的最大数量更新目标检查点值。
    • 7. 发明申请
    • APPARATUS AND METHOD FOR CONTROLLABLY RELEASING A SUBSTANCE
    • 控制释放物质的装置和方法
    • US20110303760A1
    • 2011-12-15
    • US12950053
    • 2010-11-19
    • Ashok JoshiTruman WoldDavid EreksonJohn Howard Gordon
    • Ashok JoshiTruman WoldDavid EreksonJohn Howard Gordon
    • A61L9/04
    • A61L9/127A61L2209/131A61L2209/132
    • An apparatus for controllably releasing a substance is disclosed herein. In one embodiment, such an apparatus includes a chamber to store a non-gaseous fluid. An outlet communicates with a bottom of the chamber to dispense the non-gaseous fluid. An inlet communicates with a top of the chamber to enable gas to flow into the chamber. To regulate the flow of non-gaseous fluid through the outlet, a regulator element is coupled to the inlet to regulate the flow of gas into the chamber. In certain embodiments, to provide more consistent release rates, the chamber includes a short wide portion situated above a relatively long narrow portion. Such a configuration generates more consistent head pressure and thus more consistent release rates for the non-gaseous fluid. A corresponding method is also disclosed herein.
    • 本文公开了可控释放物质的装置。 在一个实施例中,这种装置包括用于存储非气态流体的室。 出口与室的底部连通以分配非气态流体。 入口与室的顶部连通,以使气体能够流入腔室。 为了调节通过出口的非气态流体的流动,调节器元件联接到入口以调节进入室的气体流。 在某些实施例中,为了提供更一致的释放速率,腔室包括位于相对长的狭窄部分上方的短宽度部分。 这种配置产生更一致的头部压力,从而产生非气态流体的更一致的释放速率。 本文还公开了相应的方法。
    • 8. 发明申请
    • EFFICIENT NETWORK DATA TRANSFER
    • 有效的网络数据传输
    • US20090037424A1
    • 2009-02-05
    • US11831809
    • 2007-07-31
    • Margaret SusairajSumanta ChatterjeeAshok Joshi
    • Margaret SusairajSumanta ChatterjeeAshok Joshi
    • G06F17/30
    • H04L67/1097G06F17/30575H04L67/2861
    • An approach for providing efficient network data transfer service is provided. In one embodiment, a first database server receives, from a second database server, a first request to access a first storage subsystem. Here, the second database server cannot access first data in the first storage subsystem without another database server transmitting the first data to the second database server. In response, the first database server provides the second database server a first set of access primitives. Using the first set of access primitives, the second database server may access data stored in the first storage subsystem that may be otherwise not accessible. As a result, the first database server receives, from the second database server, a first data access request to access first data stored in the first storage subsystem.
    • 提供了一种提供高效网络数据传输服务的方法。 在一个实施例中,第一数据库服务器从第二数据库服务器接收访问第一存储子系统的第一请求。 这里,第二数据库服务器无法访问第一个存储子系统中的第一个数据,而另一个数据库服务器将第一个数据发送到第二个数据库服务器。 作为响应,第一数据库服务器向第二数据库服务器提供第一组访问原语。 使用第一组访问原语,第二数据库服务器可以访问存储在第一存储子系统中可能以其他方式不可访问的数据。 结果,第一数据库服务器从第二数据库服务器接收访问存储在第一存储子系统中的第一数据的第一数据访问请求。