小编The*_*aom的帖子

我有一个大约有 3000 万行的表（很快就会增加两倍/三倍），我必须在其中进行定期更新。表结构如下：

id, 
cookie_id VARCHAR(45), 
country VARCHAR(45), 
category VARCHAR(45), 
other_non_relevant_columns

索引看起来像这样：

SHOW INDEX FROM data;
+-------+------------+------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name               | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+------------------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| data  |          0 | PRIMARY                |            1 | id          | A         |    24767570 |     NULL | NULL   |      | BTREE      |         |               |
| data  |          1 | cookie_index           |            1 | cookie_id   | …