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