如果是这样的话，清单6 中的 @Transactional注释在设置了只读标志且传播模式被设置为REQUIRED时，它的作用是什么呢？
Okay, so if that is the case, what does the @Transactional annotation do in Listing 6 when the read-only flag is set and the propagation mode is set to REQUIRED?
Profiling是一个非常有用的优化代码的工具，但是它的作用是判断问题的位置；它并不能真正指出潜在的问题是什么，以及如何解决这些问题。
Profiling is a useful tool for optimizing code, but all it does is identify the potential location of the problem; it doesn't actually point out what the potential issue is or how to resolve it.
Profiling是一个非常有用的优化代码的工具，但是它的作用是判断问题的位置；它并不能真正指出潜在的问题是什么，以及如何解决这些问题。
Profiling is a useful tool for optimizing code, but all it does is identify the potential location of the problem; it doesn't actually point out what the potential issue is or how to resolve it.
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