Which two are true about reclaiming space used by Flashback logs in Oracle Database 19c and later releases? (Choose two.)
A. Space is always reclaimed automatically when the retention period for Flashback logs is lowered.
B. Space might be reclaimed proactively before space pressure occurs.
C. Space might be reclaimed automatically when the retention period for Flashback logs is lowered.
D. Space is only reclaimed when there is space pressure in the Fast Recovery Area. (FRA)
E. Space is always reclaimed proactively before space pressure occurs.

https://docs.oracle.com/en/database/oracle/oracle-database/19/bradv/maintaining-rman-backups.html#GUID-26C1A1E8-5555-4399-9DD1-39BA90E45A0C
Starting with Oracle Database Release 19c, the management of space in the fast recovery area is simplified. Oracle Database monitors flashback logs in the fast recovery area and automatically deletes flashback logs that are beyond the retention period. When the retention target is reduced, flashback logs that are beyond the retention period are deleted immediately.http://www.cndba.cn/hbhe0316/article/108608http://www.cndba.cn/hbhe0316/article/108608http://www.cndba.cn/hbhe0316/article/108608http://www.cndba.cn/hbhe0316/article/108608http://www.cndba.cn/hbhe0316/article/108608

The COMPATIBLE initialization parameter must be set to 19.0.0 or higher for flashback logs to be automatically deleted.

In scenarios where a sudden workload spike causes a large number of flashback logs to be created, the workload is monitored for several days before deleting flashback logs that are beyond the retention period. This avoids the overhead of recreating the flashback logs, if another peak workload occurs soon after.
Not convinced with the always. Looks like BC can be righthttp://www.cndba.cn/hbhe0316/article/108608http://www.cndba.cn/hbhe0316/article/108608

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