Mysql 5.5中怎么設置數據庫參數

Mysql 5.5中怎么設置數據庫參數，針對這個問題，這篇文章詳細介紹了相對應的分析和解答，希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。

--全局級別
mysql> show global variables like '%server%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| character_set_server | utf8            |
| collation_server     | utf8_general_ci |
| server_id            | 1               |
+----------------------+-----------------+
3 rows in set (0.00 sec)

mysql> set global character_set_server=gbk;
Query OK, 0 rows affected (0.10 sec)

mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name        | Value          |
+----------------------+----------------+
| character_set_server | gbk            |
| collation_server     | gbk_chinese_ci |
| server_id            | 1              |
+----------------------+----------------+
3 rows in set (0.01 sec)

也可以使用下面方式來修改
mysql> show global variables like 'character_set_server';
+----------------------+--------+
| Variable_name        | Value  |
+----------------------+--------+
| character_set_server | latin1 |
+----------------------+--------+
1 row in set (0.00 sec)

mysql> set @@global.character_set_server=gbk;
Query OK, 0 rows affected (0.00 sec)

mysql> show global variables like 'character_set_server';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| character_set_server | gbk   |
+----------------------+-------+
1 row in set (0.01 sec)

--會話級別

mysql> set session character_set_server='utf8';
Query OK, 0 rows affected (0.00 sec)

mysql> show global variables like '%server%';
+----------------------+----------------+
| Variable_name        | Value          |
+----------------------+----------------+
| character_set_server | gbk            |
| collation_server     | gbk_chinese_ci |
| server_id            | 1              |
+----------------------+----------------+
3 rows in set (0.00 sec)

--show  variables查詢的是會話級別的參數

mysql> show  variables like '%server%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| character_set_server | utf8            |
| collation_server     | utf8_general_ci |
| server_id            | 1               |
+----------------------+-----------------+
3 rows in set (0.00 sec)

mysql> show session variables like '%server%';
+----------------------+-----------------+
| Variable_name        | Value           |
+----------------------+-----------------+
| character_set_server | utf8            |
| collation_server     | utf8_general_ci |
| server_id            | 1               |
+----------------------+-----------------+
3 rows in set (0.00 sec)

即使是使用set global命令設置的參數，在數據庫重啟后，相關的參數也會失效；如果想讓參數永久生效，可以將參數寫在配置文件里面。

[root@localhost mysql]# vim /etc/my.cnf

# Character set
character_set_server = gbk
collation_server = gbk_bin

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