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The SCOTT/TIGER user exists in two databases, BOSTON_DB and DALLAS_DB, in two different locations. Each database has a tnsnames.ora file defining DALLAS_DB as a service name. Examine this command: CREATE DATABASE LINK dblink1 CONNECT TO scott IDENTIFIED BY tiger USING 'dallas_db'; How do you execute the command so that only SCOTT in BOSTON_DB can access the SCOTT schema in DALLAS_DB?
Correct Answer: B
https://docs.oracle.com/cd/B28359_01/server.111/b28310/ds_concepts002.htm#ADMIN12085 Database links are either private or public. If they are private, then only the user who created the link has access; if they are public, then all database users have access. https://docs.oracle.com/database/121/SQLRF/statements_5006.htm#SQLRF01205