RMAN Recovery Scenario - system datafile corrupted or lost - What to do? 

High Level Steps:
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RMAN - Database backup:
rman target /
CONFIGURE CONTROLFILE AUTOBACKUP ON;
RMAN] backup database plus archivelog;
RMAN] backup database format='/u01/backup/backup_%d_%T_%U';
RMAN] backup archivelog all format='/u01/backup/archive_%d_%T_%U';
RMAN] list backup of tablespace system;
SQL] shut immediate
SQL] shut abort;
SQL] startup mount;
RMAN] restore datafile 1;
$ls -ld system*
SQL] select file#,checkpoint_change#, status, recover from v$datafile_header;
RMAN] recover datafile 1;
SQL] select checkpoint_change#, status, recover FROM v$datafile_header;
SQL] alter database open;
Please refer the below blog for more details:
mallik034.blog...
Regards,
Mallikarjun Ramadurg
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