Updates database in a transaction; evicts cache before the previous transaction completes; evicts cache again for safety after the previous transaction has completed successfully or not.
在一个事务中更新数据库；在上一个事务完成前就清除缓存；为了安全起见，无论事务成功与否，在事务完成后再次清除缓存。
This substantial excess of value creates a comfortable margin of safety in each transaction.
这种大量的超额价值在每个交易中创造出一个相当大的安全边际。
Of time and the completion of the transaction, in order to safety should be promptly closed the trading window.
并且一次交易完成，为了安全应及时关闭交易窗口。
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