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Connecting DB with different users

When you connect using sysdba or sysoper, then you are sys or public user, no matter what username/password you provide :
$ sqlplus / as sysdba



SQL*Plus: Release 10.1.0.3.0 - Production on Mon Jan 2 18:00:59 2006



Copyright (c) 1982, 2004, Oracle.  All rights reserved.





Connected to:

Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - Production

With the Partitioning, OLAP and Data Mining options



SQL> sho user

USER is "SYS"

SQL> conn / as sysoper

Connected.

SQL> sho user

USER is "PUBLIC"

SQL> conn scott/tiger as sysdba

Connected.

SQL> sho user

USER is "SYS"

SQL> conn test/test as sysoper

Connected.

SQL> sho user

USER is "PUBLIC"
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