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Are both client and server at least version 11.1?
Have you taken a look at the Database Change Notification Support section in the Oracle Data Provider for .NET documentation?
Also, see the following discussion (Using Continuous Query Notification (CQN)) from the database docs:
From the ROWID Option section:
"Too many rows were changed in a single registered object within a transaction (the upper limit is approximately 80)."
[ link accurate as of posting ]
Edited by: Mark Williams on Oct 26, 2012 5:07 PM