SQL referencing Two database instances

I have searched through most of the posts regarding this subject so please bear with me.
I have created two views in two database instances. Dev and prd.
I am attempting to execute a simple query from Dev within TOAD.
select * from [view_Name]
minus
select * from [view_Name]@PRD
When I execute this I receive an error that the remote connection cannot be found.
Do I have to create a database link using the TNS connection string, or is there another way to reference another database instance within the SQL?
Any help is appreciated.

You need to create a database link (see [url http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_5005.htm#i2061505]Oracle® Database SQL Reference).
But I would not refer to other database objects directly like that. Should the link name change, or the remote object name's change, then each and every reference to those needs to be updated in all SQL and PL/SQL code.
When dealing with foreign databases (like Informix for example), objects are case sensitive. Which means ample use of quotes to enforce case on the Oracle side.
All this gets to be quite messy - especially during the maintenance of the code.
Thus, instead of "hard references", use "soft references". Create local views on remote objects. Use those local views in all SQL and PL/SQL code. Any change to database link or remote object now only requires the applicable view to be updated - no hunting for code that needs to be changed.

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Long Text
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Message was edited by: Volker Lehari8

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