为什么MGR需要使用主键？针对这个问题，今天小编总结这篇有关MGR表的文章，希望能帮助更多想解决这个问题的朋友找到更加简单易行的办法。
验证MGR架构表需要使用主键，不然插入数据会报错。
mysql> show tables;
+--------------+
| Tables_in_dd |
+--------------+
| a |
+--------------+
1 row in set (0.00 sec)
mysql> desc a;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
1 row in set (0.00 sec)
mysql> insert into a values(1);
ERROR 3098 (HY000): The table does not comply with the requirements by an external plugin.
mysql> alter table a add primary key (id);
Query OK, 0 rows affected (0.02 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> desc a;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
+-------+---------+------+-----+---------+-------+
1 row in set (0.01 sec)
mysql> insert into a values(1);
Query OK, 1 row affected (0.00 sec)
mysql> insert into a values(1);
Query OK, 1 row affected (0.00 sec)
mysql> select * from a;
+----+
| id |
+----+
| 1 |
+----+
1 row in set (0.00 sec)看完上述内容，你们对MGR架构表需要使用主键的原因大概了解了吗？如果想了解更多相关文章内容，欢迎关注亿速云行业资讯频道，感谢各位的阅读！
