How to Restore spfile from backup

1.Connect to target Database with RMAN.

i)If you have lost your spfile while your database is running then,

RMAN> CONNECT TARGET /

ii)If your database is not up and you don't use recovery catalog then use,

RMAN>CONNECT TARGET /

RMAN>SET DBID 3386862614

2)Start the instance with dummy parameter file.

RMAN>STARTUP FORCE NOMOUNT

3) Restore server parameter file.

i)             To restore in default location,

RMAN>RESTORE SPFILE FROM AUTOBACKUP;

ii)            To restore in another location,

RMAN> RESTORE SPFILE TO 'new_location' FROM AUTOBACKUP;

iii)           If you want to restore to a pfile then use,

RMAN> RESTORE SPFILE TO PFILE '/tmp/initTEMP.ora';

4) Start the instance.

RMAN>STARTUP;