Access to Oracle Database by a specific user from a client system.

Hi All,
I need to restrict a particular client system to access the database only by a specific user credentials. I mean system A(hostname) can only connect the database PQR only and only by user U123. Any help is sincerely appreciated.
Regards
Swapan

Hi,
I solved it by a trigger at logon on V$SESSION which validates MACHINE like [HOSTNAME] and username not like [the_user_I_would_allow].
It works now.
Thanks for your reply.
Regards
Swapan

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import java.io.ByteArrayInputStream;
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import java.sql.Connection;
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import java.sql.SQLException;
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