How a user of external database can be connected to other database

Hi
I have two databases A and B. I have one user XYZ on database B.we want user XYZ to be connected to database A and also wants to create few tables on database A. Can you please tell me what are list of steps i need to perform.
Regards,
RJ.

You can create a database link between database A and B to manipulate data in database A while connected to B. But you cannot create tables using database links. It does not allow DDLs in remote database. Tranparent gateway is a database link between oracle and some other database.
Syntax is to create the link in B is
create database link <name> connect to <user_in_A> identified by <password_in_A> using 'A';

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