并发问题通过在每次更新或删除时比较所提交的版本信息和服务器上的版本信息来解决。
Concurrency issues are checked by comparing the submitted version info with the one on the server during every update or delete.
如果没有两阶段提交支持，请求者需在更新数据时负责确保源中的一致性。
Without two phase commit support, the requester is responsible to ensure consistency among the sources when updating data.
只有在事务管理器启动两阶段提交进程时，更新才会变得确定。
The updates only become hardened once the transaction manager initiates the two-phase commit process.
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