Friday Oct 12, 2012

Crash/Instance Recovery与Media Recovery的本质区别

Crash/Instance Recovery针对需要恢复的实例从增量检查点(incremental checkpoint)开始apply redo应用重做日志。由于日志覆盖的先提条件是完成相关日志的logfile switch checkpoint,且从定义上说归档日志总是落后于实例的检查点,所以对于crash/instance recovery崩溃或实例恢复总是只需要访问读取在线的重做日志(online redo logfile)。[Read More]
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author's avatar The Maclean Liu
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