RMAN backup message ora-19809 ora-19804

rman Backup error message ：

ORA-19809: limit exceeded for recovery files

ORA-19804: cannot reclaim 52428800 bytes disk space from 2147483648 limit

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03009: failure of backup command on ORA_DISK_1 channel at 05/03/2022 10:35:27

ORA-19809: limit exceeded for recovery files

ORA-19804: cannot reclaim 52428800 bytes disk space from 2147483648 limit

The problem is db_recovery_file_dest_size There is not enough space for backup

terms of settlement ：

1： Clean up expired backups ,

2： increase recovery_file_dest_size Parameter value is ok ;

SQL> show parameter db_recover

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

db_recovery_file_dest                string      /oracle/flash_recovery_area

db_recovery_file_dest_size           big integer 2G

SQL> alter system set db_recovery_file_dest_size=4G scope=spfile;

System altered.

Restart the database