MySQL 8

MySQL 5.7 was the most popular version of the open source database. But several legacy problems needed to be solved, performance increased, and new features added. The biggest change is a true data dictionary which removes all those odd little files with meta-data (.frm, myi, myd, etc) and provides transactional ALTER TABLEs. Plus you see Invisible Indexes, roles, CTEs/Windowing functions, UTF8MB4 support, and learn what happened to MySQL 6 and MySQL 7.

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