No, it shouldn't have any trouble.
Are you obtaining the data directly from a table or from a SQL query. If the latter, I'd try running the query (but with a count(*) rather than your columns for the select statement) to see how many rows the query returns.
If from a table.... Again, perform a select count(*) from MyTable in Oracle and see how many rows it indicates.. I'm very very far from Oracle guru or even novice status - does Oracle have any form of row level security?