MariaDB [(none)]> SELECT COUNT(*), sum(data_length), sum(index_length), sum(data_free) FROM information_schema.tables;
+----------+------------------+-------------------+----------------+
| COUNT(*) | sum(data_length) | sum(index_length) | sum(data_free) |
+----------+------------------+-------------------+----------------+
| 418 | 307067895808 | 191055077376 | 17789091840 |
+----------+------------------+-------------------+----------------+
