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    • 3. 发明授权
    • Method and system for data processing with recovery capability
    • 具有恢复能力的数据处理方法和系统
    • US07251716B2
    • 2007-07-31
    • US10849222
    • 2004-05-20
    • Noriko NagaeNobuo KawamuraTakayoshi Shimokawa
    • Noriko NagaeNobuo KawamuraTakayoshi Shimokawa
    • G06F12/00
    • G06F11/1471G06F12/0866
    • The data processing system controls, from the database management system on a host computer, the storage device subsystem which stores log data supplied from the database management system; allocates on a disk cache in the storage device subsystem in advance a log-dedicated buffer area of a size equal to that of the log data output between checkpoints; writes log data into the buffer area; and, in the event of a host computer failure, reads out the log data from the disk cache without making access to a disk device. Since the log information required for the recovery of the data processing device is cached on the storage device side, the time it takes to read the necessary log information can be shortened, which in turn reduces the system recovery time.
    • 数据处理系统从主计算机上的数据库管理系统控制存储从数据库管理系统提供的日志数据的存储设备子系统; 提前在存储设备子系统的磁盘缓存上分配与检查点之间输出的日志数据大小相等的日志专用缓冲区; 将日志数据写入缓冲区; 并且在主机计算机故障的情况下,从磁盘缓存读取日志数据,而不访问磁盘设备。 由于恢复数据处理设备所需的日志信息被缓存在存储设备侧,因此可以缩短读取所需日志信息所需的时间,从而缩短系统恢复时间。
    • 6. 发明授权
    • Data structure in database, database system for managing database and database managing method and system
    • 数据库中的数据结构,管理数据库的数据库系统和数据库管理方法和系统
    • US07225178B2
    • 2007-05-29
    • US10084222
    • 2002-02-28
    • Takayoshi ShimokawaKazuo Masai
    • Takayoshi ShimokawaKazuo Masai
    • G06F17/30
    • G06F17/30289Y10S707/99931
    • Bookmark information indicative of a time corresponding to a given time series data piece for a predetermined time, state transition information indicative of a state of the time series data piece for the predetermined time, and the time series data piece are loaded in a database. The state transition information has one of a value indicative of an online state, a value indicative of a loading state, and a value indicative of a state in which data in the data area is empty. The time series data pieces for the predetermined times are loaded in a plurality of data areas of the database in sequence of times. In accordance with a data deletion request, state transition information corresponding to a data piece of information corresponding to a data piece of interest is set to a value indicating that the data piece of interest is empty.
    • 将指示与给定时间序列数据相对应的时间的信息预定时间,表示时间序列数据的状态转移信息预定时间,并将该时间序列数据片段加载到数据库中。 状态转移信息具有指示在线状态的值,表示负载状态的值和表示数据区域中的数据为空的状态的值。 将预定时间的时间序列数据按时间顺序加载到数据库的多个数据区域中。 根据数据删除请求,将与对应于感兴趣的数据片段的信息的数据段对应的状态转换信息设置为表示感兴趣的数据片段为空的值。