SQL connect /as sysdba;

SQL> connect /as sysdba;
Connected.
what's reason that we can access DB withoug password like that? and what parameter need to adjusted to control this?

This is called OS authentication. It means the OS has positively identified you as a dba, so you are not required to present a password to access the sysdba role.
If you are working on a Windows platform it is enough that two conditions are met, first you must belong to the ORA_DBA privileged group, either the user you use to locally connect or the user to connect through a domain account.
And the parameter SQLNET.AUTHENTICATION_SERVICES= (NTS) at the sqlnet.ora file. If this parameter is commented, you must authenticate using the password.
On a unix platform, you must belong to the privileged group declared at install time. Most frequently it is the dba or oinstall group.
It is only valid if you are logged on the same machine where the ORACLE_HOME resides. Otherwise the use of the password file and the remote_login_passwordfile is required.
~ Madrid.

Similar Messages

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    - UNIX: Checklist for Resolving Connect AS SYSDBA Issues Note [69642.1|https://metalink.oracle.com/metalink/plsql/f?p=130:14:3634364694467571378::::p14_database_id,p14_docid,p14_show_header,p14_show_help,p14_black_frame,p14_font:NOT,730067.1,1,1,1,helvetica]
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    >
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