Can I chain database links in Oracle?

Question

I have 3 databases. 1 links to 2, 2 links to 3. I'd like to query tables in 3, from 1. I tried third_db_tab@3@2 and it did not work. Wondering if this is possible and if so, what the syntax is.

Answer 1

I think you can do this by creating synonyms. In database 2 create a synonym:

CREATE SYNONYM third_db_tab for third_db_tab@3;

then in database 1 create a second synonym:

CREATE SYNONYM third_db_tab for third_db_tab@2;

This is untested (I don't have three databases running right now), but I think Oracle is smart enough to untangle the synonyms.