DBID without Select OR RMAN

You can retive database id without Using v$view this way is useful when you losing your control file or data file and you need to know your DBID :

connect / as sysdba
SQL> startup nomount;
 
 
SQL> alter system dump datafile '/home/oracle/app/oracle/oradata/orcl/system01.dbf' block min 1 block max 2;
 
System altered.
 
tail -f /home/oracle/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_10680.trc
...
Start dump data block from file /home/oracle/app/oracle/oradata/orcl/system01.dbf minblk 1 maxblk 2
V10 STYLE FILE HEADER:
Compatibility Vsn = 186646528=0xb200000
Db ID=1229390655=0x4947033f, Db Name='ORCL'
...
SQL>  alter system dump datafile '/home/oracle/app/oracle/oradata/orcl/undotbs01.dbf'  block min 1 block max 2;
 
System altered.
 
tail -f /home/oracle/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_10680.trc
...
Start dump data block from file /home/oracle/app/oracle/oradata/orcl/undotbs01.dbf minblk 1 maxblk 2
V10 STYLE FILE HEADER:
Compatibility Vsn = 186646528=0xb200000
Db ID=1229390655=0x4947033f, Db Name='ORCL'

Thank you
Osama Mustafa

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