Oracle 闪回区(Oracle Flash recovery area)满了RMAN备份报错ORA-19804 ORA-19809

ORA-19809: limit exceeded for recovery files
ORA-19804: cannot reclaim 1561238528 bytes disk space from 21474836480 limit

[oracle@oracle11-1 ~]$ oerr ora 19804
19804, 00000, "cannot reclaim %s bytes disk space from %s limit"
// *Cause: Oracle cannot reclaim disk space of specified bytes from the
//         DB_RECOVERY_FILE_DEST_SIZE limit.
// *Action: There are five possible solutions:
//          1) Take frequent backup of recovery area using RMAN.
//          2) Consider changing RMAN retention policy.
//          3) Consider changing RMAN archived log deletion policy.
//          4) Add disk space and increase DB_RECOVERY_FILE_DEST_SIZE.
//          5) Delete files from recovery area using RMAN.
[oracle@oracle11-1 ~]$

alter system set db_recovery_file_dest_size=10G scope=both;

select * from v$recovery_file_dest;
show parameter db_recovery_file_dest
select * from v$flash_recovery_area_usage;