备份数据库注意事项：
1.备份的位置
2.是否使用FRA
3.备份位置的权限和空间
数据库备份
1.备份整个数据库
RMAN> backup database plus archivelog delete input;
Starting backup at 07-SEP-18 --备份日期
current log archived --归档？
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=931 device type=DISK
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=123 RECID=117 STAMP=986199636
channel ORA_DISK_1: starting piece 1 at 07-SEP-18
channel ORA_DISK_1: finished piece 1 at 07-SEP-18
piece handle=/u01/FRA/OCP/backupset/2018_09_07/o1_mf_annnn_TAG20180907T082036_fs4v8o8c_.bkp tag=TAG20180907T082036 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
channel ORA_DISK_1: deleting archived log(s)
archived log file name=/u01/FRA/OCP/archivelog/2018_09_07/o1_mf_1_123_fs4v8nfh_.arc RECID=117 STAMP=986199636
Finished backup at 07-SEP-18
Starting backup at 07-SEP-18
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/OCP/datafile/o1_mf_system_fb8w44fm_.dbf
input datafile file number=00003 name=/u01/app/oracle/oradata/OCP/datafile/o1_mf_undotbs1_fb8w44gd_.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/OCP/datafile/o1_mf_users_fb8w44gz_.dbf
input datafile file number=00002 name=/u01/app/oracle/oradata/OCP/datafile/o1_mf_sysaux_fb8w44g7_.dbf
input datafile file number=00005 name=/u01/app/oracle/oradata/OCP/datafile/o1_mf_example_fb8w6fnx_.dbf
channel ORA_DISK_1: starting piece 1 at 07-SEP-18
channel ORA_DISK_1: finished piece 1 at 07-SEP-18
piece handle=/u01/FRA/OCP/backupset/2018_09_07/o1_mf_nnndf_TAG20180907T082038_fs4v8q06_.bkp tag=TAG20180907T082038 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:02:35
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 07-SEP-18
channel ORA_DISK_1: finished piece 1 at 07-SEP-18
piece handle=/u01/FRA/OCP/backupset/2018_09_07/o1_mf_ncsnf_TAG20180907T082038_fs4vfmgs_.bkp tag=TAG20180907T082038 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 07-SEP-18
Starting backup at 07-SEP-18
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=1 sequence=124 RECID=118 STAMP=986199797
channel ORA_DISK_1: starting piece 1 at 07-SEP-18
channel ORA_DISK_1: finished piece 1 at 07-SEP-18
piece handle=/u01/FRA/OCP/backupset/2018_09_07/o1_mf_annnn_TAG20180907T082317_fs4vfogg_.bkp tag=TAG20180907T082317 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
channel ORA_DISK_1: deleting archived log(s)
archived log file name=/u01/FRA/OCP/archivelog/2018_09_07/o1_mf_1_124_fs4vfo07_.arc RECID=118 STAMP=986199797
Finished backup at 07-SEP-18
RMAN> list archivelog all;
specification does not match any archived log in the repository
##查看备份集的大小
RMAN> list backup of database summary;
List of Backups
===============
Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
------- -- -- - ----------- --------------- ------- ------- ---------- ---
4 B F A DISK 07-SEP-18 1 1 NO TAG20180907T082038
RMAN> list backup of archivelog all summary;
List of Backups
===============
Key TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
------- -- -- - ----------- --------------- ------- ------- ---------- ---
1 B A A DISK 07-SEP-18 1 1 NO TAG20180907T080602
3 B A A DISK 07-SEP-18 1 1 NO TAG20180907T082036
6 B A A DISK 07-SEP-18 1 1 NO TAG20180907T082317
原文：https://www.cnblogs.com/bondait/p/9607602.html