我对特定数据库有一个奇怪的问题：
mysql> update person set last_name=null where first_name='john';
ERROR 1713 (HY000): Undo log record is too big.
可能是什么问题？ （我已经用Google搜索了相当的日志）
在Mac OSX 10.12.6上使用brew安装的mysql 5.7.20。
show table status where name = 'person'
-> ;
+--------------------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+--------------------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------+
| person | InnoDB | 10 | Dynamic | 650918 | 4322 | 2813853696 | 0 | 1369833472 | 6291456 | NULL | 2017-09-12 14:31:20 | 2017-10-24 12:37:03 | NULL | utf8mb4_unicode_ci | NULL | | |
+--------------------+--------+---------+------------+--------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------+
1 row in set (0.00 sec)