recovering the database if system datafile is lost or
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recovering a database if system datafile is lost or damagesTRANSCRIPT
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RECOVERING THE DATABASE IF SYSTEM
DATAFILE IS LOST OR CORRUPTED
Posted by Narashim Reddy .R on August 16, 2009
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[oracle@reddy ~]$ export ORACLE_SID=rub
[oracle@reddy ~]$ sqlplus sys as sysdba
SQL*Plus: Release 10.2.0.1.0 Production on Fri Oct 31 16:26:10 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Enter password:
Connected to an idle instance.
SQL> startup;
ORACLE instance started.
Total System Global Area 348127232 bytes
Fixed Size 1219328 bytes
Variable Size 289408256 bytes
Database Buffers 50331648 bytes
Redo Buffers 7168000 bytes
Database mounted.
Database opened.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /home/oracle/rub/archive
Oldest online log sequence 0
Next log sequence to archive 1
Current log sequence 1
SQL> select name from v$datafile;
NAME
/home/oracle/rub/datafiles/system01.dbf
/home/oracle/rub/datafiles/undotbs1.dbf
/home/oracle/rub/datafiles/sysaux01.dbf
-
/home/oracle/rub/datafiles/users01.dbf
SQL> select name from v$controlfile;
NAME
/home/oracle/rub/control/c1.ctl
SQL> alter tablespace system begin backup;
Tablespace altered.
SQL> alter tablespace undotbs1 begin backup;
Tablespace altered.
SQL> alter tablespace sysaux begin backup;
Tablespace altered.
SQL> alter tablespace users begin backup;
Tablespace altered.
SQL> !
[oracle@reddy ~]$ mkdir backup
[oracle@reddy ~]$ cd rub/
[oracle@reddy rub]$ cd control/
[oracle@reddy control]$ ls
c1.ctl
[oracle@reddy control]$ cp c1.ctl /home/oracle/backup/
[oracle@reddy control]$ cd ..
[oracle@reddy rub]$ cd datafiles/
[oracle@reddy datafiles]$ ls
redo01.log redo02.log sysaux01.dbf system01.dbf temp01.dbf undotbs1.dbf
users01.dbf
[oracle@reddy datafiles]$ cp *.dbf /home/oracle/backup/
[oracle@reddy datafiles]$ cd ..
[oracle@reddy rub]$ cd archive/
[oracle@reddy archive]$ ls
[oracle@reddy archive]$ cd $ORACLE_HOME/dbs
[oracle@reddy dbs]$ ls
initrub.ora spfilerub.ora
[oracle@reddy dbs]$ cp initrub.ora /home/oracle/backup/
[oracle@reddy dbs]$ cp spfilerub.ora /home/oracle/backup/
[oracle@reddy dbs]$ cd /home/oracle/backup/
[oracle@reddy backup]$ ls
c1.ctl initrub.ora sysaux01.dbf system01.dbf temp01.dbf undotbs1.dbf
users01.dbf spfilerub.ora
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[oracle@reddy backup]$ exit
exit
SQL> alter tablespace system end backup;
Tablespace altered.
SQL> alter tablespace undotbs1 end backup;
Tablespace altered.
SQL> alter tablespace sysaux end backup;
Tablespace altered.
SQL> alter tablespace users end backup;
Tablespace altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> !
[oracle@reddy ~]$ cd rub/
[oracle@reddy rub]$ cd datafiles/
[oracle@reddy datafiles]$ ls
redo01.log redo02.log sysaux01.dbf system01.dbf temp01.dbf undotbs1.dbf
users01.dbf
[oracle@reddy datafiles]$ rm -rf system01.dbf
[oracle@reddy datafiles]$ cd
[oracle@reddy ~]$ exit
exit
SQL> startup;
ORACLE instance started.
Total System Global Area 348127232 bytes
Fixed Size 1219328 bytes
Variable Size 289408256 bytes
Database Buffers 50331648 bytes
Redo Buffers 7168000 bytes
Database mounted.
ORA-01157: cannot identify/lock data file 1 see DBWR trace file
ORA-01110: data file 1: /home/oracle/rub/datafiles/system01.dbf
SQL> !
[oracle@reddy ~]$ cd backup/
[oracle@reddy backup]$ ls
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c1.ctl initrub.ora sysaux01.dbf system01.dbf temp01.dbf undotbs1.dbf
users01.dbf
[oracle@reddy backup]$ cp system01.dbf /home/oracle/rub/datafiles/
[oracle@reddy backup]$ cd
[oracle@reddy ~]$ exit
exit
SQL> shutdown immediate;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL> startup;
ORACLE instance started.
Total System Global Area 348127232 bytes
Fixed Size 1219328 bytes
Variable Size 289408256 bytes
Database Buffers 50331648 bytes
Redo Buffers 7168000 bytes
Database mounted.
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1: /home/oracle/rub/datafiles/system01.dbf
SQL> recover datafile 1;
ORA-00279: change 373322 generated at 10/31/2008 16:30:29 needed for
thread 1
ORA-00289: suggestion : /home/oracle/rub/archive/arch_1_669569864_1.arc
ORA-00280: change 373322 for thread 1 is in sequence #1
Specify log: {=suggested | filename | AUTO | CANCEL}
Log applied.
Media recovery complete.
SQL> alter database open;
Database altered. . . . . . . .