提交读，未提交读，可重复读，可串行读。

Read committed, Read uncommitted, Repeatable Read, Serializable.

youdao

会发生不可重读、幻像读和读未提交数据。

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

youdao

会发生不可重读、幻像读和读未提交数据。

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

youdao