Find the data directory of your MySQL server

1. Login into your MySQL instance.
2. Type and execute the query below.

select @@datadir;

When executing from the command line you might get something similar

mysql> select @@datadir;

// Output
+-----------------+
| @@datadir       |
+-----------------+
| /var/lib/mysql/ |
+-----------------+
1 row in set (0.00 sec)