Database systems have been designed to manage business critical information and make this information accessible on request to connected clients. There is, however, an ever-increasing need to share relevant information actively with disconnected clients and/or external systems, e.g., to propagate and/or automatically react to relevant information as soon as it becomes available. Leveraging the existing database infrastructure, Oracle created a solution to this problem. The solution is state of the art in terms of functionality and operational characteristics. This Oracle technology is widely used and supports many highly visible applications. Categories and Subject Descriptors H. INFORMATION SYSTEMS H.4. INFORMATIONS SYSTEMS APPLICATIONS H.4.3 Communications Applications General Terms Design. Keywords Database, Type system, Publish/Subscribe, JMS, Reliable Messaging, Post Dating, Rules, Capture, Apply, Retention, Auditing, Expression evaluation.