Hacker"Transactions: myths, surprises and opportunities" by Martin Kleppmann
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Kleppmann 的转账备份例子说明，逐笔读到已提交的数据，合计仍可能少一百元。读取两账户时跨过了转账提交点，每一笔都真，组合却不对应任何同一时刻。
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you've seen different parts of the database at different points in timeyou only read the data once it's been committed