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MySQL 5.7 Reference Manual
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2.3.4.4 Initializing the Data Directory

If you installed MySQL using the noinstall package, you may need to initialize the data directory:

  • Windows distributions prior to MySQL 5.7.7 include a data directory with a set of preinitialized accounts in the mysql database.

  • As of 5.7.7, Windows installation operations performed using the noinstall package do not include a data directory. To initialize the data directory, use the instructions at Section 2.10.1, “Initializing the Data Directory”.