The ALM schema provides the primary record types for managing work, which are called: Request, Task, and Activity.

ALM模式为管理工作提供了主要的记录类型，称作：请求、任务，以及活动。

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When this command is issued, it waits for checkpoint request from primary.

当发出该命令时，将等待来自主要服务器的检查点请求。

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Message exchange pattern: data services could be accessed via the four primary message exchange patterns - request/reply (tight SLA), request/reply (relaxed SLA), fire/forget, and publish/subscribe.

消息交换模式：数据服务可以通过四种主要的消息交换模式被访问：请求-应答（严格SLA）、请求-应答（宽松SLA ），即发即弃和发布-订阅。

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