RECOVER IMAGE COPY WITH INCRMENTAL BACKUP

Question

dear all
i want to know what this comand do
recover copy of datafile 4 with tag ' ';
is this when take backup copy to datafile and i have incremental backup
when corruption occurs i write this command
instead of restore and recovery only this command is make the restore and applay incremental backup ???
MANY THANKS

Answer 1

there are some recovery scenarios.
1- If you lost all datafiles
SQL> startup mount;
RMAN> restore database;
RMAN> recover database;
SQL> alter database open;
2- if you lost a tablespace
SQL> alter tablespace users offline;
RMAN> restore tablespace users;
RMAN> recover tablespace users;
SQL> alter tablespace users online;
if you can not offline tablespace then
$ sqlplus “/ as sysdba”
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore tablespace users;
RMAN> recover tablespace users;
SQL> alter database open;
3- if you lost a datafile
SQL> alter database datafile '/oracle/oradata/users.dbf' offline;
RMAN> restore datafile '/oracle/oradata/users.dbf'
RMAN> recover datafile '/oracle/oradata/users.dbf'
SQL> alter database datafile '/oracle/oradata/users.dbf' online;
if you cannot offline datafile then
$ sqlplus “/ as sysdba”
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore datafile '/oracle/oradata/users.dbf';
RMAN> recover datafile '/oracle/oradata/users.dbf';
SQL> alter database open;
4- if you lost your controlfile
$ sqlplus “/ as sysdba”
SQL> shutdown abort;
SQL> startup nomount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> set dbid = 3970640872;
RMAN> restore controlfile;
SQL> alter database mount;
SQL> alter database open;
you will receive an error ORA-01589 when you open database
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
In this situation you must do;
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> recover database;
SQL> alter database open resetlogs;
RMAN> reset database;
if you open database with resetlogs, SCN number will be zero. In this situation all previous backups will be invalid. You must full backup.
5- May be a special situation. You need to incomplete recovery.
A. Time-Based incomplete recovery;
$ sqlplus "/ as sysdba"
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore database until time "to_date('06/05/11 12:0:00','DD/MM/YY HH24:MI:SS')";
RMAN> recover database until time "to_date('06/05/11 12:0:00','DD/MM/YY HH24:MI:SS')";
SQL> alter database open resetlogs;
B. SCN-Based incomplete recovery;
$ sqlplus "/ as sysdba"
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore database until scn 1000;
RMAN> recover database until scn 1000;
SQL> alter database open resetlogs;
C. archive log sequence based incomplete recovery;
$ sqlplus "/ as sysdba"
SQL> shutdown abort;
SQL> startup mount;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore database until sequence 9923;
RMAN> recover database until sequence 9923;
SQL> alter database open resetlogs;
6- if you need some archive logs in your backup
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN> restore ARCHIVELOG FROM TIME 'SYSDATE-1' UNTIL TIME 'SYSDATE';
Or
RMAN> restore ARCHIVELOG FROM TIME "to_date('07/11/05 00:00:01','MM/DD/YY HH24:MI:SS')
UNTIL TIME 'SYSDATE';
7- if your data block is corrupted you will receive an error below.
Hata:
ORA-01578: ORACLE data block corrupted (file # 8, block # 13)
ORA-01110: data file 8: '/oracle/oradata/users.dbf'
for recover data block;
$ rman target / catalog_user/ catalog_user_password@catalogdb
RMAN>blockrecover datafile 8 block 13;
For Block-Level Media Recovery - Concept & Example (Doc ID 144911.1)
8- if you have a image copy backup and your datafile number 2 has problems then you can switch datafile number2 to image copy.
RMAN>sql ‘alter database datafile 2 offline’;
RMAN>switch datafile 2 to copy;
RMAN>recover datafile 2;
RMAN>sql ‘alter database datafile 2 online’;