Read committed, Read uncommitted, Repeatable Read, Serializable.

提交读，未提交读，可重复读，可串行读。

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Read committed -- The transaction can read data committed by other transactions.

Read committed（读已提交） ——事务可以读取由另一事务提交的数据。

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Instead they will read the currently committed version of the row.

相反，它们会读取这一行的当前已经提交的版本。

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Instead they will read the currently committed version of the row.

相反，它们会读取这一行的当前已经提交的版本。

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