Mysqldump 數據導出問題和客戶端受權後鏈接失敗問題

 

1，使用mysqldump時報錯(1064)，這個是由於mysqldump版本過低與當前數據庫版本不一致致使的。
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           //或者登錄mysql，select version();也可查看版本
Server version: 5.6.25-log Source distribution
.........

這樣的話必須知道mysqldump的絕對路徑，在mysql的安裝目錄下有。

2，導出時指定字符集，報錯
Character set 'utf-8' is not a compiled character set and is not specifie .
--default-character-set=utf-8

這個是由於字符集錯了。是--default-character-set=utf8

3，導出時提示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.

關於GTID是5.6之後，加入了全局事務 ID (GTID) 來強化數據庫的主備一致性，故障恢復，以及容錯能力。
官方給的：A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (master).
因此多是由於在一個數據庫裏面惟一，可是當導入其餘的庫就有可能重複。全部會有一個提醒。

能夠經過添加--set-gtid-purged=off  或者–gtid-mode=OFF這兩個參數設置。
頗有肯能是在導入庫中從新生產GTID，而不用原來的。

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

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在本地（192.168.1.152）部署好mysql環境，受權遠程客戶機192.168.1.%鏈接本機的mysql，在iptables防火牆也已開通3306端口。
以下：

mysql> select host,user,password from mysql.user;
+--------------+-----------------+----------------------------------------------------------+
| host              | user                 | password                                       |
+--------------+-----------------+----------------------------------------------------------+
| localhost    | root                 |                                                     |
| fdm1         | root                 |                                                     |
| 127.0.0.1    | root                 |                                                     |
| localhost    |                      |                                                     |
| fdm1         |                      |                                                     |
| 192.168.1.%  | db_hqsb              | *DFC9DC16B13651A95ECEC3A26E07D244431B55C9           |
| 192.168.1.%  | db_ro_hqsb           | *2C0B0DD50595BB40879110437BEEF026D019DFB7           |
| 192.168.1.%  | db_jkhwuser          | *2C0B0DD50595BB40879110437BEEF026D019DFB7           |
| 192.168.1.25 | slave                | *EE52B8EACB3CCD13624273AD6B5CDA52B9B53EB7           |
| 192.168.1.%  | tech_db_user         | *6053E57C7B61043DC2C6B4E3291D5F61CCC23F5C           |
| 192.168.1.%  | game_db_user         | *05EA4D71C9A1273ECF3E24E6323F7175AE45C366           | 
| localhost    | zabbix               | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9           |
+---------------+---------------+-----------------------------------------------------------+

問題：
在客戶機（好比192.168.1.20）上遠程鏈接上面192.168.1.152機器的mysql，鏈接失敗！
[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

解決：
是因爲192.168.1.152的mysql裏「host爲localhost，user和password爲空」這條語句致使的，刪除這條便可解決問題！

mysql> delete from mysql.user where host="localhost" and user="";
Query OK, 1 row affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

這樣，受權鏈接的客戶機就能成功鏈接了！
[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

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