小编Fan*_*Lin的帖子

我尝试设置从从服务器到主服务器的复制。

CHANGE MASTER TO
  MASTER_HOST = 'master',
  MASTER_PORT = 3306,
  MASTER_USER = 'repl',
  MASTER_PASSWORD = 'xxx';

而且我确实向 master 上的用户授予了权限。我可以用mysql命令从slave机器连接到master

mysql -h master -u repl -p
mysql> show grants;
GRANT RELOAD, SUPER, REPLICATION SLAVE, CREATE USER ON *.* TO 'repl'@'xxx' IDENTIFIED BY PASSWORD 'xxx'

mysql> select 1;
+---+
| 1 |
+---+
| 1 |
+---+
1 row in set (0.04 sec)

如您所见，权限正确，连接正常，但是复制到 master 的连接总是失败。

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Connecting to master
                  Master_Host: master
                  Master_User: repl …

我尝试将一些表从一个 MySQL 数据库迁移到另一个数据库，但遇到错误：

ERROR 1062 (23000) at line 108: Duplicate entry 'außer' for key 'PRIMARY'

我试图找出为什么，在目标数据库中，我跑了

mysql> select 'außer' = 'auser';
+--------------------+
| 'außer' = 'auser'  |
+--------------------+
|                  1 |
+--------------------+
1 row in set (0.07 sec)

如你所见，MySQL认为它们是相同的，我检查了配置变量

mysql> show variables like 'coll%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| collation_connection | utf8_general_ci |
| collation_database   | utf8_general_ci |
| collation_server     | utf8_general_ci |
+----------------------+-----------------+

mysql> show variables like 'character%';
+--------------------------+------------------------------------------+
| Variable_name            | Value                                    |
+--------------------------+------------------------------------------+
| …