<{p}>80、Which two are true about instance recovery?<{/p}>

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

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