网络性能下降，因为要将更新从应用程序服务器推送到数据库服务器。
Degraded network performance, as the updates were pushed from the application servers to the database server.
这称为 “快照语义”，这意味着每个更新操作从逻辑上说应用于原文档的单独快照。
This is called "snapshot semantics", meaning each update operation is logically applied to a separate snapshot of the original document.
想要执行某个事务(例如更新订单或者购买某个产品)的应用程序，只需从应用程序中调用存储过程。
Applications wanting to begin a transaction, such as updating an order or purchasing a product simply need to invoke the appropriate stored procedure from the application.
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