It’s bad idea to run MySQL server on microSD card because usually this type of application will be heavy on read/write cycles and this will effect the lifespan of the sd card. Plus depending on the type of card you are using the external hard drive will be faster. There are two ways to do it. First move files to external drive and change data dir variable or creating symlink. We will use the latter (How to set up MySQL on Raspberry Pi).
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