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When messages arrive, the SQL Remote Message Agent (dbremote) reads the messages and then stores them in cache memory until they are applied. This caching of messages prevents:
Rereading of out-of-order messages from the message system, which may lower performance on large systems. Caching of messages is useful when messages are being read over a WAN (such as Remote Access Services or POP3 through a modem).
Contention between database worker threads reading messages (a single threaded task) because the message contents are cached.
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