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Consider a scenario where you have two databases: On database A you need to access data on database B.

You could create a view on database A that selects from the table on database B.

CREATE OR REPLACE VIEW Demographics.Employees(
employee_id, employee_dept
)
AS
    SELECT employee_id, employee_dept
    FROM Employee@DB_B;
/

Or, you could create a synonym on database A that points to the table on database B.

CREATE OR REPLACE SYNONYM Demographics.Employees FOR Employee@DB_B;

What are the advantages and disadvantage to using a view across the DB link versus a synonym across the DB link?

If the databases are within an Exadata platform, does that change the recommendation?

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