Why is Pfile not in RMAN - backup

Question

RMAN backups spfile together with controlfile. Why doesn't it support backing up pfile? Is is possible to configure it as to backup pfile too?
Thx.
Aliq.
Message was edited by:
user547746

Answer 1

pfiles are obsolete, and you should stop using them.Incorrect ,obsolete means not usable but one can use it and one using it,you can say its not recommended,on the basis of human readable pfile you created spfile .
Before spfile , pfile commented parameter mess the DBA when and what for used this parameter ,though DBA used comments by providing date and if it happens to change 20 times then he has to make comments 20 times ,with the invent of spfile you can save yours own pfile with dated version within filename i.e (initORCL15042008.ora) and then create the spfile from this pfile ,now you can maitnin yours pfile history easily as before.You can track when and what was changed.You can revert back to yours current instance as old one by creating spfile from oldpfile.
To OP
spfile is for single source of server parameters which is fact, thats why RMAN take spfile backup rather pfile.
You can also change some dynamic parameter during instance working ,you can change it in the spfile as well within instance memory.
Khurram