mysql> use drupal;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> describe contribution_tracking;
+-----------------+---------------------+------+-----+---------+----------------+
| Field           | Type                | Null | Key | Default | Extra          |
+-----------------+---------------------+------+-----+---------+----------------+
| id              | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| contribution_id | int(10) unsigned    | YES  | UNI | NULL    |                |
| note            | text                | YES  |     | NULL    |                |
| referrer        | varchar(4096)       | YES  |     | NULL    |                |
| anonymous       | tinyint(1) unsigned | NO   |     | NULL    |                |
| utm_source      | varchar(128)        | YES  | MUL | NULL    |                |
| utm_medium      | varchar(128)        | YES  | MUL | NULL    |                |
| utm_campaign    | varchar(128)        | YES  | MUL | NULL    |                |
| optout          | tinyint(1) unsigned | NO   |     | NULL    |                |
| language        | varchar(8)          | YES  |     | NULL    |                |
| ts              | char(14)            | YES  | MUL | NULL    |                |
| owa_session     | varbinary(255)      | YES  |     | NULL    |                |
| owa_ref         | int(11)             | YES  |     | NULL    |                |
+-----------------+---------------------+------+-----+---------+----------------+
13 rows in set (0.00 sec)

mysql> show indexes from contribution_tracking;
+-----------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
| Table                 | Non_unique | Key_name        | Seq_in_index | Column_name     | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+-----------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
| contribution_tracking |          0 | PRIMARY         |            1 | id              | A         |     5431210 |     NULL | NULL   |      | BTREE      |         |
| contribution_tracking |          0 | contribution_id |            1 | contribution_id | A         |     5431210 |     NULL | NULL   | YES  | BTREE      |         |
| contribution_tracking |          1 | ts              |            1 | ts              | A         |     5431210 |     NULL | NULL   | YES  | BTREE      |         |
| contribution_tracking |          1 | utm_source_id   |            1 | utm_source      | A         |        8381 |     NULL | NULL   | YES  | BTREE      |         |
| contribution_tracking |          1 | utm_medium_id   |            1 | utm_medium      | A         |          17 |     NULL | NULL   | YES  | BTREE      |         |
| contribution_tracking |          1 | utm_campaign_id |            1 | utm_campaign    | A         |          17 |     NULL | NULL   | YES  | BTREE      |         |
| contribution_tracking |          1 | utm_campsign_id |            1 | utm_campaign    | A         |          17 |     NULL | NULL   | YES  | BTREE      |         |
+-----------------------+------------+-----------------+--------------+-----------------+-----------+-------------+----------+--------+------+------------+---------+
7 rows in set (0.57 sec)