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    • 4. 发明授权
    • Error-detection in database update processes
    • 数据库更新过程中的错误检测
    • US5404502A
    • 1995-04-04
    • US22472
    • 1993-02-25
    • Wes WarnerGreg HopePaul Oeuvray
    • Wes WarnerGreg HopePaul Oeuvray
    • G06F11/14G06F11/00
    • G06F11/1402G06F2201/84G06F2201/87Y10S707/99953
    • A technique for integrity error detection in a temporal transaction oriented database system. The database system has records and processing rules. Each record has an effective time. Each processing rule has a range of effective times. The record types include transaction records, master records, shadow master records and snapshot records. Each transaction record or snapshot record is related to one master record and each master record may have a plurality of related transaction and snapshot records. Each snapshot record is a copy of its related master record at a given effective time. On the insertion of one or more backdated transaction records or reversal of one or more existing transaction records the master record is recalculated by replaying from a prior snapshot forward, all processing rules and transaction records, having appropriate effective times. A shadow master record is recalculated by simultaneously repeating each of the steps of the replay on the shadow master record, but in this case ignoring any new backdated transactions and including any newly reversed transaction records. The comparison of the shadow master record after replay and the value of the master record before replay indicates the presence or absence of an integrity error.
    • 一种用于在面向时间事务的数据库系统中完整性错误检测的技术。 数据库系统具有记录和处理规则。 每个记录都有一个有效的时间。 每个处理规则都有一个有效时间范围。 记录类型包括事务记录,主记录,阴影主记录和快照记录。 每个事务记录或快照记录与一个主记录相关,并且每个主记录可以具有多个相关的事务和快照记录。 每个快照记录是在给定有效时间内其相关主记录的副本。 在插入一个或多个后退交易记录或反转一个或多个现有交易记录时,通过从先前快照向前,具有适当有效时间的所有处理规则和交易记录重播来重新计算主记录。 通过同时重复在影子主记录上重播的每个步骤来重新计算影子主记录,但在这种情况下,忽略任何新的后期交易并包括任何新反转的交易记录。 重放后的影子主记录和重放前主记录的值的比较表示是否存在完整性错误。