Check Flashback Recovery Area Size

show parameter db_recovery

NAME                       TYPE        VALUE                  
-------------------------- ----------- ---------------------- 
db_recovery_file_dest      string      F:\flash_recovery_area 
db_recovery_file_dest_size big integer 900G     

show parameter db_flashback

NAME                          TYPE    VALUE 
----------------------------- ------- ----- 
db_flashback_retention_target integer 720 

select space_used/(1024*1024*1024) gb_used, space_limit/(1024*1024*1024) gb_limit from v$recovery_file_dest;

   GB_USED   GB_LIMIT
---------- ----------
427.937144        900

select * from v$flash_recovery_area_usage;

FILE_TYPE               PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES     CON_ID
----------------------- ------------------ ------------------------- --------------- ----------
CONTROL FILE                             0                         0               0          0
REDO LOG                                 0                         0               0          0
ARCHIVED LOG                           .03                       .01              13          0
BACKUP PIECE                         46.85                         0              13          0
IMAGE COPY                               0                         0               0          0
FLASHBACK LOG                          .68                       .65             122          0
FOREIGN ARCHIVED LOG                     0                         0               0          0
AUXILIARY DATAFILE COPY                  0                         0               0          0

8 rows selected. 

Set FRA limit to be 90% of the drive size

alter system set db_recovery_file_dest_size=900G SCOPE=BOTH;