【多选题】
A <{p}>AWR snapshots must be deleted when no longer required by ADDM<{/p}>
B <{p}>By default, MMON creates an AWR snapshot every 30 minutes.<{/p}>
C <{p}>ADDM can recommend extending the buffer cache<{/p}>
D <{p}>ADDM can recommend shrinking the buffer cache<{/p}>
E <{p}>They By default, AWR snapshots are automatically purged after eight days<{/p}>
F <{p}>TheADDM performs its 分析ysis only when a DBA requests it.<{/p}>
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