因为不是从磁盘连续读取页面的，所以在读取每个页面之前，都需要进行查找并存在循环延迟。
Because the pages are not read sequentially from the disk, both seek and rotational delays occur before each page can be read.
帮助查找非正常延迟、系统运行缓慢或系统表现为挂起然后又恢复的情况的根源。
Helps find the source of unusual delays, slow behaviour in a system, or situations when the system appears to hang and then recovers.
记录订单消息的目的是对消息执行 XQuery 操作，以查找订单延迟的原因。
The purpose of logging the order messages is to perform XQuery operations on the message to find out why orders were delayed.
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