An unrepeatable read and phantom read can occur.

会发生不可重读和幻像读。

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An unrepeatable read, phantom read, and reads of uncommitted data can occur.

会发生不可重读、幻像读和读未提交数据。

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An unrepeatable read can occur when the transaction reads some data again and finds that it changed since the last read due to another transaction that modified this data and committed.

事务再次读取某数据时发现它自最后一次读操作之后由于另一个事务修改并提交了该数据而发生了更改，则会发生不可重读。

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