Recover database without controlfile and redo logs

Question

Hi guys,
I am doing a testing with an Oracle Database 11.1.0.7.0, I want recover a database in this scenario without using RMAN:
-All controlfiles are missing
-All redo logs are missing
-I have a Backup Controlfile To Trace Resetlogs (bkp_controlfile.sql)
-The database is in archivelog mode
-The database was created with OMF (Oracle Managed Files)
So I have done this steps:
1) When the database was opened I rename all controlfiles and all redo logs
2) Shutdown Abort
3) I run the bkp_controlfile.sql, here I have a problem...
The database put in NOMOUNT, the controlfile was created and started the RECOVER DATABASE USING BACKUP CONTROLFILE, but when run ALTER DATABASE OPEN RESETLOGS; appear this:
ERROR at line 1:
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1:
'/u02/app/oracle/oradata/OMF/datafile/o1_mf_system_68hzcb2z_.dbf'I wasn´t expect this because I don´t want recover a datafile, I only want open with resetlogs.
Any suggestion to help me?
Thanks a lot.

Answer 1

Excelent! Thanks for your answers Markus and Hemant.
In conclusion...
- If we have all redo logs availables we can recreate the control file and recover the database without any problems using backup controlfile to trace noresetlogs*.
- if we haven´t all redo logs availables, there are 2 situations:
1) If the database shutdown properly:_ We will be able to open the database using recover database using backup controlfile until cancel*.
2) If the database doesn´t shutdown properly:_ We won´t be able to open the database with only a backup controlfile to trace.
With all this I close this thread. Was very good experience.
If anyone would add something will be welcome.
Thanks for all
I wish add the results of one of my tests: if I did all the steps in only one session of sqlplus I can shutdown properly the database, but if do the shutdown immediate* in a new session I can´t shutdown properly the database. Here I post the output:
ALL IN ONE SESSION*
[oracle@prueba ~]$ $ORACLE_HOME/bin/sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Wed Sep 22 13:58:10 2010
Copyright (c) 1982, 2008, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> ALTER SYSTEM SWITCH LOGFILE;
System altered.
SQL> SHUTDOWN IMMEDIATE
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> STARTUP
ORACLE instance started.
Total System Global Area  631914496 bytes
Fixed Size                  1315224 bytes
Variable Size             377491048 bytes
Database Buffers          247463936 bytes
Redo Buffers                5644288 bytes
Database mounted.
Database opened.
SQL> SHUTDOWN IMMEDIATE
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> @/home/oracle/bkp_controlfile.sql
ORACLE instance started.
Total System Global Area  631914496 bytes
Fixed Size                  1315224 bytes
Variable Size             377491048 bytes
Database Buffers          247463936 bytes
Redo Buffers                5644288 bytes
Control file created.
SQL> RECOVER DATABASE USING BACKUP CONTROLFILE UNTIL CANCEL;
ORA-00279: change 398764 generated at 09/22/2010 14:09:49 needed for thread 1
ORA-00289: suggestion :
/u02/app/oracle/flash_recovery_area/OMF/archivelog/2010_09_22/o1_mf_1_40_%u_.arc
ORA-00280: change 398764 for thread 1 is in sequence #40
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
CANCEL
Media recovery cancelled.
SQL> ALTER DATABASE OPEN RESETLOGS;
Database altered.
SQL> ALTER TABLESPACE TEMP ADD TEMPFILE '/u02/app/oracle/oradata/OMF/datafile/o1_mf_temp_69n3z3vv_.tmp' SIZE 50331648  REUSE AUTOEXTEND ON NEXT 655360  MAXSIZE 32767M;
Tablespace altered.
SQL>
ALL IN DIFERENT SESSIONS*
[oracle@prueba ~]$ $ORACLE_HOME/bin/sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Wed Sep 22 13:55:47 2010
Copyright (c) 1982, 2008, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> ALTER DATABASE BACKUP CONTROLFILE TO TRACE AS '/home/oracle/bkp_controlfile.sql' RESETLOGS;
Database altered.
SQL> SHUTDOWN IMMEDIATE
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> STARTUP MOUNT
ORACLE instance started.
Total System Global Area  631914496 bytes
Fixed Size                  1315224 bytes
Variable Size             377491048 bytes
Database Buffers          247463936 bytes
Redo Buffers                5644288 bytes
Database mounted.
SQL> ALTER DATABASE ARCHIVELOG;
Database altered.
SQL> ALTER DATABASE OPEN;
Database altered.
SQL> ALTER SYSTEM SWITCH LOGFILE;
System altered.
SQL> ALTER SYSTEM SWITCH LOGFILE;
System altered.
SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
[oracle@prueba ~]$ $ORACLE_HOME/bin/sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Wed Sep 22 13:58:10 2010
Copyright (c) 1982, 2008, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> SHUTDOWN IMMEDIATE
ORA-00210: cannot open the specified control file
ORA-00202: control file: '/u02/app/oracle/oradata/OMF/controlfile/o1_mf_69n3x6n5_.ctl'
ORA-27041: unable to open file
Linux Error: 2: No such file or directory
Additional information: 3