mysqldump数据导出问题和客户端授权后连接失败问题

1，使用mysqldump时报错(1064)，这个是因为mysqldump版本太低与当前数据库版本不一致导致的。

mysqldump: Couldn't execute 'SET OPTION SQL_QUOTE_SHOW_CREATE=1': You have an error in your SQL syntax; check the manual that 

corresponds to your MySQL server version for the right syntax to use near 'OPTION SQL_QUOTE_SHOW_CREATE=1' at line 1 (1064)

[root@bastion-IDC ~]# mysqldump --version

mysqldump Ver 10.13 Distrib 5.1.61, for redhat-linux-gnu (x86_64)

[root@bastion-IDC ~]# mysql           //或者登陆mysql，select version();也可查看版本

Server version: 5.6.25-log Source distribution

.........

这样的话必须知道mysqldump的绝对路径，在mysql的安装目录下有。

2，导出时指定字符集，报错

Character set 'utf-8' is not a compiled character set and is not specifie .

--default-character-set=utf-8

这个是因为字符集错了。是--default-character-set=utf8

3，导出时提示warning，A partial dump from a server that has GTIDs

[root@bastion-IDC ~]# mysqldump -uroot -p xqsj_db > xqsj_db20160811.sql

Warning: A partial dump from a server that has GTIDs will by default include the GTIDs of all transactions, even those that 

changed suppressed parts of the database. If you don't want to restore GTIDs, pass --set-gtid-purged=OFF. To make a complete 

dump, pass --all-databases --triggers --routines --events.

关于GTID是5.6以后，加入了全局事务 ID (GTID) 来强化数据库的主备一致性，故障恢复，以及容错能力。

官方给的：A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (master).

所以可能是因为在一个数据库里面唯一，但是当导入其他的库就有可能重复。所有会有一个提醒。

可以通过添加--set-gtid-purged=off 或者–gtid-mode=OFF这两个参数设置。

很有肯能是在导入库中重新生产GTID，而不用原来的。

[root@bastion-IDC ~]# mysqldump -uroot --set-gtid-purged=off -p xqsj_db > xqsj_db20160811.sql                      #这样就ok了！

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在本地（192.168.1.152）部署好mysql环境，授权远程客户机192.168.1.%连接本机的mysql，在iptables防火墙也已开通3306端口。

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<code>mysql&gt; </code><code>select</code> <code>host,user,password from mysql.user;</code>

<code>+--------------+-----------------+----------------------------------------------------------+</code>

<code>| host              | user                 | password                                       |</code>

<code>| localhost    | root                 |                                                     |</code>

<code>| fdm1         | root                 |                                                     |</code>

<code>| 127.0.0.1    | root                 |                                                     |</code>

<code>| localhost    |                      |                                                     |</code>

<code>| fdm1         |                      |                                                     |</code>

<code>| 192.168.1.%  | db_hqsb              | *DFC9DC16B13651A95ECEC3A26E07D244431B55C9           |</code>

<code>| 192.168.1.%  | db_ro_hqsb           | *2C0B0DD50595BB40879110437BEEF026D019DFB7           |</code>

<code>| 192.168.1.%  | db_jkhwuser          | *2C0B0DD50595BB40879110437BEEF026D019DFB7           |</code>

<code>| 192.168.1.25 | slave                | *EE52B8EACB3CCD13624273AD6B5CDA52B9B53EB7           |</code>

<code>| 192.168.1.%  | tech_db_user         | *6053E57C7B61043DC2C6B4E3291D5F61CCC23F5C           |</code>

<code>| 192.168.1.%  | game_db_user         | *05EA4D71C9A1273ECF3E24E6323F7175AE45C366           |</code>

<code>| localhost    | zabbix               | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9           |</code>

<code>+---------------+---------------+-----------------------------------------------------------+</code>

问题：

在客户机（比如192.168.1.20）上远程连接上面192.168.1.152机器的mysql，连接失败！

[root@huanqiu ~]# mysql -udb_ro_hqsb -h 192.168.1.152 -pmhxzkhl0802xqsjdb

ERROR 1130 (HY000): Host '192.168.1.20' is not allowed to connect to this MySQL server

解决：

是由于192.168.1.152的mysql里“host为localhost，user和password为空”这条语句导致的，删除这条即可解决问题！

mysql&gt; delete from mysql.user where host="localhost" and user="";

Query OK, 1 row affected (0.00 sec)

mysql&gt; flush privileges;

Query OK, 0 rows affected (0.00 sec)

这样，授权连接的客户机就能成功连接了！

[root@huanqiu ~]# mysql -uxqsj_db_ro_user -h 192.168.1.152 -pmhxzkhl0802xqsjdb

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 28

Server version: 5.1.73 Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql&gt;

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本文转自散尽浮华博客园博客，原文链接：http://www.cnblogs.com/kevingrace/p/5762314.html，如需转载请自行联系原作者