Forgotten restore point and flash recovery logs

Few  years ago we started to use this database for a new project. Previous one was expired and abandoned.
Flash recovery area was set quite big (1500GB) comparing to the database size (200GB) and we missed the fact that the flash area had a significant space used over the years.

SQL> SELECT * FROM   V$FLASH_RECOVERY_AREA_USAGE;

FILE_TYPE    PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
------------ ------------------ ------------------------- ---------------
CONTROLFILE                   0                         0               0
ONLINELOG                     0                         0               0
ARCHIVELOG                    0                         0               0
BACKUPPIECE                 .03                         0               6
IMAGECOPY                 13.13                         0              17
FLASHBACKLOG              44.04                         0            7019

44.04% used by FLASHBACKLOG  - - -

PERCENT_SPACE_RECLAIMABLE  - - -  says nothing to delete from flash.

db_flashback_retention_target is one day. database size is 200GB. flashback log size 660GB  -  seems quite wasteful.

database control:

 Current size of the flashback logs(GB) 660.563
 Lowest SCN in the flashback data 1318377092383
 Flashback Time Sep 10, 2010 5:18:35 PM

here we've got the key - flashback time - which indicates that there should be a restore point keeping all flashback before 2010.

select guarantee_flashback_database gua, storage_size, time, name
  from v$restore_point;

GUA  STORAGE_SIZE  TIME                                 NAME
------  ------------    -------------------------------      -----------------
YES    7.0927E+11  10-SEP-10 05.18.35.000000000 PM      BEOFRE_DELTA_POST

So, it is the guaranteed restore point to 10-SEP-2010. We just drop it since no need for any purpose (at least in a new project);

SQL> DROP RESTORE POINT BEOFRE_DELTA_POST; 
Restore point dropped.

as a result old logs removed from flash area.

FILE_TYPE    PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES
------------ ------------------ ------------------------- ---------------
CONTROLFILE                   0                         0               0
ONLINELOG                     0                         0               0
ARCHIVELOG                    0                         0               0
BACKUPPIECE                 .03                         0               6
IMAGECOPY                 13.13                         0              17
FLASHBACKLOG                  0                         0               1

Never forget guaranteed restore points. They are not being deleted automatically.

Thanks,