oracle - the good way to retrieve data from two db -

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Let's say that I currently work with Hibernate with an Oracle database "Webunit", and I need some data from the database link, which is


1. Can I hibernate link queries of "gateway" to "Webunit"?
2. Or is it better to create a "gateway" process with my query, then call it "Webunit"?

What is the user's privilege of "webbook"? If you create a query for the database link located in "GATEWAY" which is private, then you can not throw the user "WEBUNIT". Appropriate in another way.

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