如果用户与数据进行交互，会使记录锁定相对长的时间，保守式并发并不是可伸缩的选项。
Pessimistic concurrency is not a scalable option when users are interacting with data and causing records to be locked for relatively large periods of time.
保守式并发在更新期间锁定数据，使其他用户不会陷于提交不兼容数据更改的危险中。
Pessimistic concurrency locks data during update so that other users are not in danger of committing incompatible data changes.
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