Oracle Notification Services??

[Chen Venkataraman]

Does anyone know what's the equivalent of SQL Server Notification Services in Oracle? I'm primarily looking to maintain the consistency of the data caches obtained from reading the database to be sync'ed with any changes made to the database. i.e, need a way for apps to register interest & be notified when a row changes for e.g. Are there any classes/add-ons in the .NET framework that works with the Oracle database? Any pointers would be appreciated. Chen Venkataraman