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This section lists environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual. 

Options on the command line take precedence over values specified in option files and environment variables, and values in option files take precedence over values in environment variables. In many cases, it is preferable to use an option file instead of environment variables to modify the behavior of MySQL. See Section 4.2.2.2, “Using Option Files” . 

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