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热词
    • 3. 发明授权
    • Lost write detection and repair
    • 丢失写检测和修复
    • US07627614B2
    • 2009-12-01
    • US11072111
    • 2005-03-03
    • Wei Ming HuMark DilmanJ. William LeeJuan R. LoaizaVinay Srihari
    • Wei Ming HuMark DilmanJ. William LeeJuan R. LoaizaVinay Srihari
    • G06F17/30
    • G06F11/1471G06F11/2094G06F2201/80G06F2211/1007Y10S707/99954
    • Techniques are provided for detecting lost writes so that data corruption can be avoided. According to one technique, lost writes are detected by comparing version numbers that are indicated in redo log entries with version numbers that are indicated in corresponding blocks in a standby database. According to one technique, which may be used in conjunction with the above technique, lost writes are detected by logging read operations that occur relative to a primary database, and comparing version numbers that are indicated in read log entries with version numbers that are indicated in corresponding blocks in a standby database. According to one technique, lost writes are detected by comparing, in response to read operations, (a) version numbers that are stored in a persistent in-memory cache with (b) version numbers that are indicated in corresponding blocks that are read from a primary database.
    • 提供了用于检测丢失写入的技术,从而可以避免数据损坏。 根据一种技术,通过将重做日志条目中指示的版本号与在备用数据库中的相应块中指示的版本号进行比较来检测丢失的写入。 根据可以与上述技术结合使用的一种技术,通过记录相对于主数据库发生的读取操作来检测丢失的写入,并且将读取日志条目中指示的版本号与在 备用数据库中的相应块。 根据一种技术,通过比较读取操作来检测丢失的写入,(a)存储在持久性内存高速缓存中的版本号,(b)版本号,其在从 主数据库。