Query to retrieve MySQL database size

If you need to determine how much data a MySQL database is consuming, use the information_schema database and run the following command: mysql> use information_schema;
mysql> select table_schema, sum(data_length)/1024/1024 from tables group by table_schema;
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3 rows in set (1.04 sec)
In the example above, Uptime Infrastructure Monitor is using ~ 4.03 GB.
Note
This does not necessarily mean that the MySQL database file is 4.03 GB as it is generally much larger.