【多选题】
A Spacc is only reclamed when there is spacc pressure in the Fast Recovery Area(FRA)
B Space is always reclaimed automatically when the retention period for Flashback logs is lowered
C Space might be reclaimed proactively before space pressure occurs
D Space is always reclaimed proactively before space pressure occurs
E Space might be reclaimed automatically when the retention period for Flashback logs is lowered
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