在数据库中存储会话状态的成本可能难以承受。
Storing conversational state in the database can be prohibitively expensive.
取决于该的应用程序体系结构的更改可能包括令人生畏任务如同步会话状态和跨服务器位置复制数据库事务。
Depending on the application, changing the architecture could include daunting tasks such as synchronizing session state and replicating database transactions across server locations.
有时候这仅仅是某种类型的会话id，它可以用来从内存或数据库检索服务器端状态。
Sometimes this may just be a session id of some sort that can be used to retrieve server-side state from memory or a database.
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