Difference between CONNECT and CONNECT As SYSDBA

Hi All,
Can anyone explain me... what is the difference between this two..
SQL> SCOTT/TIGER@my_service;
you get only Scott related objects.
SQL> SCOTT/TIGER@my_service AS SYSDBA;
you get all SYS objects also..
What is happening inside.. how can u allow scott such as ordinary user to login as SYSDBA and giving all datadictionary access..
Thanks in advance

Hi,
This is because of Operating System authentication:test$ id
Here, I am the Oracle software owner, member of the dba group. ORA_DBA on Windows.
uid=103(oracle) gid=103(dba)
test$ sqlplus /nolog
SQL*Plus: Release 9.2.0.7.0 - Production on Ma Fev 7 13:15:47 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
I can connect with whatever user I want. Even if the login doesn't exists. The O.S. authenticates me.
SQL> connect / as sysdba
Connected.
SQL> show user
USER is "SYS"
SQL> connect IDont/Exist as sysdba
Connected.
SQL> show user
USER is "SYS"
SQL> connect / as sysoper
Connected.
SQL> show user
USER is "PUBLIC"
SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.7.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.7.0 - Production
test$ su - usernamehidden
Password:
(c)Copyr...
... (1,2).
test> id
Here, the user is member of the DBA group though not being the software owner.
uid=104(usernamehidden) gid=104(groupnamehidden) groups=103(dba)
test> sqlplus /nolog
SQL*Plus: Release 9.2.0.7.0 - Production on Tue Feb 7 13:17:45 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
And I still can connect without Oracle credentials.
SQL>conn / as sysdba
Connected.
SQL>exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.7.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.7.0 - Production
test>
logout...
test$ su -
Password:
(c)Copyr...
... (1,2).
You have mail.
Value of TERM has been set to "vt100".
WARNING: YOU ARE SUPERUSER !!
# id
User root is not in O.S. group DBA
uid=0(root) gid=3(groupnamehidden) groups=0(groupnamehidden),1(groupnamehidden),2(groupnamehidden),4(groupnamehidden),5(groupnamehidden),6(groupnamehidden),7(groupnamehidden),20(groupnamehidden)
# export ORACLE_HOME=/opt/oracle/Ora9i
# export ORACLE_SID=TEST
# export PATH=$PATH:$ORACLE_HOME/bin
# sqlplus /nolog
SQL*Plus: Release 9.2.0.7.0 - Production on Tue Feb 7 13:26:41 2006
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Hence O.S. user root must provide valid Oracle credentials in order to connect as sysdba.
SQL>conn / as sysdba
ERROR:
ORA-01031: insufficient privileges
SQL>conn sys/invalidpassword as sysdba
ERROR:
ORA-01031: insufficient privileges
SQL>conn sys as sysdba
Enter password:
Connected.This is all writen somewhere in TFM. Check it for further info.
Regards,
Yoann.

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