mysql> SHOW INDEX FROM bigtable;
+----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| Table    | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment |
+----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
| bigtable |          0 | PRIMARY  |            1 | id          | A         |        NULL |     NULL | NULL   |      | BTREE      | NULL    |
| bigtable |          0 | PRIMARY  |            2 | title       | A         |     2335242 |     NULL | NULL   |      | BTREE      | NULL    |
+----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+
2 rows in set (0.00 sec)