所有代码以及任何对嵌套存储过程或触发器的调用均在代理用户的安全上下文下执行。

All code, as well as any calls to nested stored procedures or triggers, executes under the security context of the proxy user.

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这也意味着您只能在存储过程的同一次执行中引用保存点，而不能从同一个过程或任何嵌套级别的其他过程的不同执行中引用。

This also means that you can refer to a savepoint only in the same execution of a procedure, but not from another execution of the same or other procedures irrespective of the nesting level.

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过程调用可以是嵌套的或递归的，但是保存点的范围被限制为定义它的存储过程的执行。

Procedure calls can be nested or recursive, but the scope of a savepoint is restricted to the execution of the stored procedure in which it is defined.

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