Sql conn anything / anything as sysdba i am able connect to my database

Question

Hi
i facing a new problem in my Database 10g R1.
i am able to connect as sysdba with
sql> conn <anything>/<anything> as sysdba
from local or if i connect from any linux machine thr ssh <oracle_owner_name>@ip ...
if i show user command..
SQL> show user;
USER is "SYS"
for more details check the following...
[oracle@dbserver ~]$ !sq
sqlplus /nolog
SQL*Plus: Release 10.1.0.3.0 - Production on Tue Jan 8 17:13:34 2008
Copyright (c) 1982, 2004, Oracle. All rights reserved.
SQL> conn sys/admin123 as sysdba
Connected.
SQL> conn sys/rpcadmin123 as sysdba
Connected.
SQL> conn sys/manager as sysdba
Connected.
SQL> conn sys/123456 as sysdba
Connected.
SQL> conn sys/dhana as sysdba
Connected.
SQL> conn dasjdaas/djahdjkada89723 as sysdba
Connected.
SQL> alter user sys identified by admin123;
User altered.
SQL> conn sys/rpcadmin123 as sysdba
Connected.
SQL> shut immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> conn sys/xxx as sysdba
Connected to an idle instance.
SQL> startup
ORACLE instance started.
Total System Global Area 369098752 bytes
Fixed Size 779176 bytes
Variable Size 116137048 bytes
Database Buffers 251658240 bytes
Redo Buffers 524288 bytes
Database mounted.
Database opened.
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options

Answer 1

i think you are fully getting ,what's my problem...I think you mean that I am not :)
conn xyzklaspdsba/dakdoa as sysdba xyzklaspdsba would be a database user
Anyway if you scroll through the document, it states that the only requirement using operating system authentication to connect is;
CONNECT / AS SYSDBA or AS SYSOPER
From remote database connection
CONNECT /@net_service_name AS SYSDBA or AS SYSOPER
Simply said it does not consider the database username or password as O/S user belongs to OSDBA or OSOPER groups.
Hope it is clear.
Adith