EXPERT RESPONSE
If you're going from Oracle RDBMS to Oracle RDBMS, this question doesn't make
sense since the DBLink would use whatever user you used when creating the link
(connect to <username> identified by <password>). If you left out the
"connect to" clause, it would be a current user link and would connect to the
remote side using the same login credentials used to login to the local
database.
If you're talking about connecting to a remote database that is non-Oracle via
a gateway, I'm not sure since the remote side would use authentication
mechanisms proprietary to that database vendor.
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