I googled "SQL server linked server to "Oracle Internet Directory" " with no luck at all;
how often does the data change in the "Oracle Internet Directory"? is it something you could export to text, and import into SQL via BULK INSERT or SSIS as a table instead of a view, refreshing it at intervals appropriate to the amount of changes that occur? if it's pretty much static, it doesn't really need to be a view to a linked server right? if it changes a lot, i would look deeper into creating the linked server to do it.
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!