Database Link question ! Please help me ....

Hi everybody,
I have some question about database link.
For example, I have 3 database, database 1 and database 2 connect together by database link db_link1, database 2 and database 3 connect together by database link db_link2.
I want to ask: Can I connect from database 1 to database 3 ? ( Of course don't use database link between database 1 and 3, just use database db_link1 and db_link2 )
Both db_link1 and db_link2 are public database link.
Can I restrict user access by 2 these public database link ?
Thanks a lot.

A database link has directionality-- it connects from one database to another database. It is not a bi-directional link.
Assuming db_link1 exists in database 1 and connects to database 2 and db_link2 exists in database 2 and connects to database 3, it should be possible to read data that is in database 3 from database 1 without creating a new database link. But you'd need some sort of intermediate layer in database 2 (i.e. a view in database 2 that queries an object in database 3) because you can't nest database links in a single SQL statement. Of course, you would almost never actually do this for a variety of reasons. The only time I've ever heard of someone using this sort of setup is if database 1 is a very recent version of Oracle and database 3 is a very very old version of Oracle such that a database link between 1 and 3 is not possible.
If you create a public database link, you cannot restrict access to that link short of potentially doing something with VPD. If you're creating a database link using a fixed username & password that would create a security issue, it would make far more sense to create private database links.
Justin

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