SHOW INDEX FROM UserActions;
+-------------+------------+--------------------+--------------+----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table       | Non_unique | Key_name           | Seq_in_index | Column_name    | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------------+------------+--------------------+--------------+----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| UserActions |          0 | PRIMARY            |            1 | actionId       | A         |   252163120 |     NULL | NULL   |      | BTREE      |         |               |
| UserActions |          1 | downloaded         |            1 | userId         | A         |      627915 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | downloaded         |            2 | actionType     | A         |      793157 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | downloaded         |            3 | mediaId        | A         |   149933056 |     NULL | NULL   |      | BTREE      |         |               |
| UserActions |          1 | downloadedVersions |            1 | userId         | A         |      850228 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | downloadedVersions |            2 | mediaVersionId | A         |   126656472 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | downloadedVersions |            3 | actionType     | A         |   162126896 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | wasChecked         |            1 | wasChecked     | A         |           1 |     NULL | NULL   | YES  | BTREE      |         |               |
| UserActions |          1 | wasChecked         |            2 | actionType     | A         |         657 |     NULL | NULL   | YES  | BTREE      |         |               |
+-------------+------------+--------------------+--------------+----------------+-----------+-------------+----------+--------+------+------------+---------+---------------+