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这个问题说明了一切。在 Chris Date 关于并发的文章中,他指出遵循两阶段锁定的事务是可序列化的,然后说遵循可重复读取的所有事务都是可序列化的。然而,可重复读取仍然可能有幻象。那么,当允许幻像时,一组遵循可重复读取隔离的事务如何可序列化?