ORACLE之rman备份：ORA-19809和ORA-19804的解决方法

操作环境：redhat 6.4  oracle 12c

rman备份出错。之前出现过，好象重新backup database就可以了，今天又出现，纪录下

RMAN-03009: failure of Contrl file and SPFILE Autobackup command on ORA_DISK_1 channel at 06/06/2018 13:43:50
ORA-19809: limit exceeded for recovery files

ORA-19804: cannot reclaim 67108864 bytes disk space from 10737418240 bytes limit

SQL> show parameter db_recovery_file_dest;
NAME      TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest      string /opt/oracle/t1/flashback
db_recovery_file_dest_size      big integer 10G
alter system set db_recovery_file_dest_size=20g scope=both; --增加到20G试试
再次rman居然正常了。