From Oracle FAQ
ORAPWD is a utility used to create a password file for an Oracle Database.
Run orapwd utility before:
- setting REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE|SHARED
- Grant SYSDBA/SYSOPER to users
In Oracle 11g, you can also grant SYSASM for ASM instances.
In Oracle 12c, you can also grant SYSDG, SYSBACKUP and SYSKM privileges.
Check V$PWFILE_USERS to see who was granted SYSDBA/SYSOPER access.
Create a new password file:
orapwd file=orapwSID password=oracle entries=5
If the password file already exists:
orapwd file=orapwSID password=oracle entries=5 FORCE=Y
The FORCE parameter is available starting from Oracle 10g. In Oracle 11g passwords become case sensitive, you can use the parameter IGNORECASE to change this behaviour; this parameter is no more available in Oracle 12c.
McPwfile is a program to check the content of your Oracle password files.