Recovery using backup controlfile

Question

hai,
can any one explain me on what is the difference between recovering database as,
recover database until cancel using backup controlfile;and
recover database until cancel;regards
ashik

Answer 1

Hi,
>>Note that you should only use a backup controlfile that was created via 'alter database backup controlfile to /path/to/your/controlfile_backup;'
Not exactly... we can use a control file that was made by a cold backup in order to recover a database.
SQL*Plus: Release 9.2.0.4.0 - Production on Tue Nov 21 21:10:19 2006
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
Enter user-name: / as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area   93394180 bytes
Fixed Size                   451844 bytes
Variable Size              67108864 bytes
Database Buffers           25165824 bytes
Redo Buffers                 667648 bytes
Database mounted.
Database opened.
SQL> create user SCOTT identified by TIGER default tablespace USERS quota unlimited on USERS;
User created.
SQL> grant connect to SCOTT;
Grant succeeded.
SQL> connect SCOTT/TIGER
Connected.
SQL> create table emp (cod number primary key);
Table created.
SQL> begin
2 for i in 1..10000 loop
3 insert into emp values (i);
4 end loop
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> select count(*) from emp;
  COUNT(*)
     10000
SQL> connect system/manager
Connected.
SQL> select name from v$archived_log;
NAME
/backup/archive/1_10.dbf
/backup/archive/1_11.dbf
/backup/archive/1_12.dbf
/backup/archive/1_13.dbf
4 rows selected.
SQL> select * from v$log;
    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM
1 1 14 512000 1 NO CURRENT 51849 22-NOV-06
         2          1         12     512000          1 YES INACTIVE                 51826 22-NOV-06
         3          1         13     512000          1 YES ACTIVE                   51840 22-NOV-06
SQL> connect / as sysdba
Connected.
Crash Simulation
SQL> shutdown abort
ORACLE instance shut down.
Lost Data files and Control Files Simulation
SQL> host
oracle@linux:/u01> rm oradata/BDRPS/*.dbf
oracle@linux:/u01> rm oradata/BDRPS/*.ctl
oracle@linux:/u01> ls -l oradata/BDRPS/
total 1524
-rw-r-----    1 oracle   oinstall   512512 2006-11-22 08:20 redo01.log
-rw-r-----    1 oracle   oinstall   512512 2006-11-22 08:18 redo02.log
-rw-r-----    1 oracle   oinstall   512512 2006-11-22 08:19 redo03.log
Restore Data Files and Control Files from last cold backup
oracle@linux:/u01> cp -a /backup/oradata/BDRPS/*.dbf oradata/BDRPS/
oracle@linux:/u01> cp -a /backup/oradata/BDRPS/*.ctl oradata/BDRPS/
oracle@linux:/u01> exit
exit
SQL> startup
ORACLE instance started.
Total System Global Area   93394180 bytes
Fixed Size                   451844 bytes
Variable Size              67108864 bytes
Database Buffers           25165824 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-00314: log 1 of thread 1, expected sequence# doesn't match
ORA-00312: online log 1 thread 1: '/u01/oradata/BDRPS/redo01.log'
Begin Recovery Process
SQL> recover database using backup controlfile;
ORA-00279: change 51548 generated at 11/07/2006 20:24:21 needed for thread 1
ORA-00289: suggestion : /backup/archive/1_10.dbf
ORA-00280: change 51548 for thread 1 is in sequence #10
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 52048 generated at 11/22/2006 08:18:35 needed for thread 1
ORA-00289: suggestion : /backup/archive/1_11.dbf
ORA-00280: change 52048 for thread 1 is in sequence #11
ORA-00278: log file '/backup/archive/1_10.dbf' no longer needed for this
recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 52056 generated at 11/22/2006 08:18:36 needed for thread 1
ORA-00289: suggestion : /backup/archive/1_12.dbf
ORA-00280: change 52056 for thread 1 is in sequence #12
ORA-00278: log file '/backup/archive/1_11.dbf' no longer needed for this
recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 52076 generated at 11/22/2006 08:18:37 needed for thread 1
ORA-00289: suggestion : /backup/archive/1_13.dbf
ORA-00280: change 52076 for thread 1 is in sequence #13
ORA-00278: log file '/backup/archive/1_12.dbf' no longer needed for this
recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
ORA-00279: change 52087 generated at 11/22/2006 08:18:37 needed for thread 1
ORA-00289: suggestion : /backup/archive/1_14.dbf
ORA-00280: change 52087 for thread 1 is in sequence #14
ORA-00278: log file '/backup/archive/1_13.dbf' no longer needed for this
recovery
In this moment, I don't have a sequence log 14 archived, then I will use the Current Log File Group for this recovery
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/u01/oradata/BDRPS/redo01.log
Log applied.
Media recovery complete.
SQL> alter database open;
alter database open
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;
Database altered.
SQL> connect SCOTT/TIGER
Connected.
SQL> select count(*) from emp;
  COUNT(*)
     10000Cheers