由于应用程序在接收到Prepare指令后将禁止调用数据库服务，那么服务如何在Commit之前存储数据呢？
As it is forbidden to call the database service after having received a Prepare, how can the caching application store its cached data at the end but before the commit?
如果在执行该指令的时候出现错误，系统设计者在程序中会正确提示服务器接下来的步骤。
The system designer has the flexibility to specify what the Server may actually do if errors occur during the service.
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