Database backup

[oracle@oracle01 ~]$ [oracle@oracle01 ~]$ rman target /   Recovery Manager: Release 11.2.0.4.0 - Production on Fri Jul 13 10:25:19 2018   Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.   connected to target database: ORA11GR2 (DBID=297877687)   RMAN> backup database;   Starting backup at 2018-07-13 10:25:28 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=38 device type=DISK 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/ora11gr2/system01.dbf input datafile file number=00002 name=/u01/app/oracle/oradata/ora11gr2/sysaux01.dbf input datafile file number=00005 name=/u01/app/oracle/oradata/ora11gr2/example01.dbf input datafile file number=00003 name=/u01/app/oracle/oradata/ora11gr2/undotbs01.dbf input datafile file number=00004 name=/u01/app/oracle/oradata/ora11gr2/users01.dbf channel ORA_DISK_1: starting piece 1 at 2018-07-13 10:25:28 channel ORA_DISK_1: finished piece 1 at 2018-07-13 10:26:15 piece handle=/u01/app/oracle/fast_recovery_area/ORA11GR2/backupset/2018_07_13/o1_mf_nnndf_TAG20180713T102528_fnj3dsn6_.bkp tag=TAG20180713T102528 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:47 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 2018-07-13 10:26:16 channel ORA_DISK_1: finished piece 1 at 2018-07-13 10:26:17 piece handle=/u01/app/oracle/fast_recovery_area/ORA11GR2/backupset/2018_07_13/o1_mf_ncsnf_TAG20180713T102528_fnj3g8bv_.bkp tag=TAG20180713T102528 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01 Finished backup at 2018-07-13 10:26:17   RMAN> quit     Recovery Manager complete. [oracle@oracle01 ~]$ cd /u01/app/oracle/oradata/ora11gr2/ [oracle@oracle01 ora11gr2]$ rm -rf system01.dbf [oracle@oracle01 ora11gr2]$ sqlplus / as sysdba   SQL*Plus: Release 11.2.0.4.0 Production on Fri Jul 13 10:27:13 2018   Copyright (c) 1982, 2013, Oracle.  All rights reserved.     Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options   SQL> shutdow abort; ORACLE instance shut down. SQL> startup ORACLE instance started.   Total System Global Area 1653518336 bytes Fixed Size                  2253784 bytes Variable Size            1006636072 bytes Database Buffers          637534208 bytes Redo Buffers                7094272 bytes Database mounted. ORA-01157: cannot identify/lock data file 1 - see DBWR trace file ORA-01110: data file 1: '/u01/app/oracle/oradata/ora11gr2/system01.dbf'     SQL> startup mount; ORA-01081: cannot start already-running ORACLE - shut it down first SQL> shut immediate ORA-01109: database not open     Database dismounted. ORACLE instance shut down. SQL> startup mount ORACLE instance started.   Total System Global Area 1653518336 bytes Fixed Size                  2253784 bytes Variable Size            1006636072 bytes Database Buffers          637534208 bytes Redo Buffers                7094272 bytes Database mounted. SQL> quit Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options [oracle@oracle01 ora11gr2]$ rman target /   Recovery Manager: Release 11.2.0.4.0 - Production on Fri Jul 13 10:28:24 2018   Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.   connected to target database: ORA11GR2 (DBID=297877687, not open)   RMAN> restore database;      Starting restore at 2018-07-13 10:28:41 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=20 device type=DISK   channel ORA_DISK_1: starting datafile backup set restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/ora11gr2/system01.dbf channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/ora11gr2/sysaux01.dbf channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/ora11gr2/undotbs01.dbf channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/ora11gr2/users01.dbf channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/ora11gr2/example01.dbf channel ORA_DISK_1: reading from backup piece /u01/app/oracle/fast_recovery_area/ORA11GR2/backupset/2018_07_13/o1_mf_nnndf_TAG20180713T102528_fnj3dsn6_.bkp channel ORA_DISK_1: piece handle=/u01/app/oracle/fast_recovery_area/ORA11GR2/backupset/2018_07_13/o1_mf_nnndf_TAG20180713T102528_fnj3dsn6_.bkp tag=TAG20180713T102528 channel ORA_DISK_1: restored backup piece 1 channel ORA_DISK_1: restore complete, elapsed time: 00:00:45 Finished restore at 2018-07-13 10:29:28   RMAN> recover database;   Starting recover at 2018-07-13 10:29:38 using channel ORA_DISK_1   starting media recovery media recovery complete, elapsed time: 00:00:01   Finished recover at 2018-07-13 10:29:39   RMAN> quit     Recovery Manager complete. [oracle@oracle01 ora11gr2]$ sqlplus / as sysdba   SQL*Plus: Release 11.2.0.4.0 Production on Fri Jul 13 10:29:53 2018   Copyright (c) 1982, 2013, Oracle.  All rights reserved.     Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options   SQL> alter database open;