DBA, the user can login as SYS using the
following command
sqlplus "/ as
sysdba"
Voila! The user is connected as sys without
even knowing the password! Note how dangerous it is to leave the
passwords of people who login to UNIX under group DBA unsecured.
Therefore, be very careful in assigning UNIX users to the DBA group.
Typically, you would create two groups
There should be separate users for the Oracle
software installation and the Oracle account owner. In addition, you
should also create separate users to manage the database, such as
startup, shutdown, etc. These should not be controlled from the
software owner or other Oracle users. Besides these users, the DBA
group privileges should never be granted to anyone.
Tip: The Oracle user should have the installed
software only, nothing else; the other tasks, like starting up,
shutting down, etc. should be performed by the individual dba user.
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