Optimistic Locking is a strategy where you read a record, take note of a version number and check that the version hasn't changed before you write the record back.

乐观锁是这样一种策略，你可以读取记录，记录版本号并检查，在你写回之前该版本没有改变。

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Take a step back and look at the forest: Apple is following a Post-PC Strategy.

FORBES: Apple Doesn't Have an iPad Strategy, It has a Post-PC Strategy