The second problem is more serious and should be of concern to anyone who's read Editing the Web: Detecting the Lost Update problem Using Unreserved Checkout.

第二个问题就更严重，需要关心谁阅读了可编辑Web：通过无条件的签出来检查丢失更新的问题。

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With some unlucky timing, an update could be lost.

如果计时失误，有一个更新可能会丢失。

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That is, if concurrent transactions update an entity bean with same primary key, updates could get lost.

如果并发事务用同样的主键更新实体 bean 时，更新资料将会丢失。

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The goal is to help organizations better secure smartphones and tablets in the workplace with a hosted service that allows the IT team to remotely locate, lock or wipe a lost or stolen device, as well as update software to protect against spyware and viruses.

FORBES: The Pros And Cons Of 'Bring Your Own Device'