MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
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 2.9.1, “Initializing the Data Directory”.