6.3. Persistence and Transactions in Queues
Queues can be configured as persistent or transient. A persistent queue is stored on disk and is therefore protected against system failure. A transient queue is not protected against failure, but because it requires no disk access, it can run faster. I assume that persistent queues will be the norm for drawbridges. Drawbridges are a lot like databases; we almost always trade performance for reliability.
Queues can also be configured as transactional or nontransactional. A transactional queue acts as a transactional resource. A nontransactional queue does not. I talked about transactional resources back in Chapter 3 (Transactions), but let me give a brief refresher here. A transactional resource is ...
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