This illustration shows a messaging environment that includes the following Oracle databases:

• ii1.example.com

• ii2.example.com

The ii1.example.com database has the following components:

• The oe.orders table.

• A trigger named enqueue_orders that fires when row is inserted into the oe.orders table. The trigger enqueues messages of order_id_date type based on the insert into the streams_queue queue.

• A propagation named send_orders that sends messages from the local streams_queue queue to the streams_queue queue at ii2.example.com.

The ii2.example.com database has the following components:

• The streams_queue queue.

• A messaging client/subscriber named strmadmin. When the strmadmin messaging client/subscriber is invoked, it uses the dequeue_orders PL/SQL procedure to dequeue and process the messages in the streams_queue queue.