Oracle remove the parameter from spfile

How to remove the parameter from the spfile.

I was getting following in the alert log:

Deprecated system parameters with specified values:

remote_os_authent

End of deprecated system parameter listing

that means there is a deprecated system parameter which we are using. At the same time I was getting the following message while startup:

SQL> startup

ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance

ORACLE instance started.

Total System Global Area 544030720 bytes

Fixed Size 1337776 bytes

Variable Size 406849104 bytes

Database Buffers 130023424 bytes

Redo Buffers 5820416 bytes

Database mounted.

Database opened.

Steps to resolve the issue are:

SQL> alter system reset remote_os_authent scope=spfile sid='*';

System altered.

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 544030720 bytes

Fixed Size 1337776 bytes

Variable Size 406849104 bytes

Database Buffers 130023424 bytes

Redo Buffers 5820416 bytes

Database mounted.

Database opened.

SQL>