更复杂的初始化脚本能做更多的事，包括声明由服务器维护的全局变量以及设置访问权限等等。

More elaborate initialization scripts can do a lot more, declaring global variables to be maintained by the server, setting up access privileges, and so on.

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创建了全局变量之后，如果拥有相应的权限，数据库中的任何会话都可以使用它。

Once a global variable has been created, then any session in the database can use it providing the right privileges are owned.

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向所有用户授予对变量的读权限。

Grant the privilege to read the variable to everyone.

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