OS authentication means that if you can log on to an authorized OS account, then you are allowed to connect to your database without the requirement of an additional password. OS authentication is administered by assigning special groups to OS accounts.
When you install the Oracle in Unix environment, you are required to specify at installation time the names of the OS groups (usually named oinstall or dba) that are assigned the database privileges of sysdba and sysoper. In a Windows environment, an OS group is automatically created (typically named ora_dba) and assigned to the OS user who installs the Oracle software.
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