Mysql 5.5中怎么设置数据库参数

Mysql 5.5中怎么设置数据库参数，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

--全局级别
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来修改
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)

--会话级别

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查询的是会话级别的参数

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命令设置的参数，在数据库重启后，相关的参数也会失效；如果想让参数永久生效，可以将参数写在配置文件里面。

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

# Character set
character_set_server = gbk
collation_server = gbk_bin

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