备份数据库数据文件
> rman
RMAN> connect target /
RMAN> backup database;
RMAN> backup current controlfile spfile;
恢复库，需在mount下执行 或者 先把数据文件offline
SQL> startup mount
> rman target /
RMAN> restore database;
SQL> recover database;
恢复控制文件，nomount下执行
RMAN> restore controlfile;
查看备份
RMAN> list backup;
查看数据库表空间：
RMAN> report schema;
备份错误解决
ORA-19809: limit exceeded for recovery files
ORA-19804: cannot reclaim 52428800 bytes disk space from 2147483648 limit
SQL> show parameter db_recover
SQL> alter system set db_recovery_file_dest_size='10G';
