【多选题】
A <{p}>It is not possible if an archived log is missing.<{/p}>
B <{p}>It is performed automatically after the database is opened; however, blocks requiring recovery are not available until they are recovered.<{/p}>
C <{p}>Setting FAST_START_MTTR_TARGET to a lower value reduces instance recovery time by causingdirty buffers to be written to disk more frequently, thereby reducing the number of I/Os needed during instance recovery.<{/p}>
D <{p}>It is performed by the Recovery Writer (RVWR) background process.<{/p}>
E <{p}>Setting FAST_START_MTTR_TARGET to a higher value reduces instance recovery time by causing The log writer to write more frquently, thereby reducing the number of I/Os needed during instance recovery.<{/p}>
F <{p}>It is performed automatically while the database remains in MOUNT state. Then the database is opened.<{/p}>
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