Fast Start MTTR

导读：

　

　　

　　The Oracle Documentationnotes: The Target MTTR Oracle metric is the effective mean time to recover (MTTR) target in seconds. Usually, it should be equal to the value of the FAST_START_MTTR_TARGETinitialization parameter.

　　If FAST_START_MTTR_TARGETis set to such a small value that it is impossible to do a recovery within its time frame, then the TARGET_MTTRfield contains the effective MTTR target, which is larger than FAST_START_MTTR_TARGET. If FAST_START_MTTR_TARGETis set to such a high value that even in the worst-case (the whole buffer cache is dirty) recovery would not take that long, then the TARGET_MTTRfield contains the estimated MTTR in the worst-case scenario. This field is 0 if FAST_START_MTTR_TARGETis not specified.

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http://www.dba-oracle.com/m_target_mttr.htm