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  • 052-64

    Which two statements are true about setting the FAST_START_MTTR_TARGET initialization parameter to a nonzero value? (Choose two.)
    A.The MTTR advisor will be disabled.
    B.Automatic checkpoint tuning will be enabled.
    C.The value for the LOG_CHECKPOINT_INTERVAL initialization parameter will be override the value for FAST_START_MTTR_TARGET.
    D.The time taken to recover the instance after the crash is always exactly the same as the value given for the FAST_START_MTTR_TARGET initialization parameter

    启用 MTTR Advisor 需要设置 STATISTICS_LEVEL 和 FAST_START_MTTR_TARGET,故 A 错
      快速启动检查点功能是通过指定所需的非零恢复平均时间(MTTR)值来启用的,该值将用于设置FAST_START_MTTR_TARGET 初始化参数。此参数控制数据库对单个实例执行崩溃恢复所花费的时间量。启用快速启动检查点功能时,Oracle 将自动保持检查点的速度,已便达到请求的 MTTR.如果将该值设置为 0,将禁用此功能,故 B 正确
    FAST_START_MTTR_TARGET 会被 LOG_CHECKPOINT_INTERVAL 所覆盖,故 C 正确
    D 错误,是在所需时间内或在尽量接近此事件的范围内,并不是指定的时间点

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  • 原文地址:https://www.cnblogs.com/Babylon/p/8000422.html
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