Oracle query is slow (or fails) from .NET app but is fast from SQL Developer

Question

We use ODP.NET to perform queries on Oracle databases, and normally it works fine. There is a particular database, and a particular view in that database, though, that we just c

Answer 1

A view adds a different magnitude of complexity. A "SELECT column FROM table WHERE rownum < 5" has probably just a single explain plan, picking data from a single local object.

For a view you should start by getting the view text SELECT TEXT FROM ALL_VIEWS WHERE VIEW_NAME = ...

There's a lot that can be different between an ODP.NET and an SQL Developer session. I'd think about NLS parameters (such as date formats) and character set settings.

If you can locate the SQL in v$sql, you can do a DBMS_XPLAN.DISPLAY_CURSOR(sql_id) to look at the different plans and see if you can identify the problem.