Whats the difference between the Messaging Gateway and the Procedural Gateway for MQ Series?

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Whats the difference between the Messaging Gateway and the Procedural Gateway for MQ Series?

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Oracle Messaging Gateway and the Procedural Gateway for MQ can both propagate messages between Oracle9i and MQ Series. However, the Messaging Gateway works with Advanced Queuing to propagate AQ messages to and from MQ Series. The procedural gateway allows customers executing PL/SQL applications to put or get messages to or from MQ Series–AQ is not required. The Messaging Gateway is designed to allow customers who have MQ Series to easily add AQ-based solutions into their environment. AQ and the Message Gateway are included free of charge with the database, and offer significant advantages over MQ Series for message queuing applications. Customers who have to build new message queuing functionality should consider building their solution using AQ and then integrating with MQ via the message gateway, rather than simply connecting their application to MQ via the procedural gateway.

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