Mysql 5.5中怎么設(shè)置數(shù)據(jù)庫參數(shù)

Mysql 5.5中怎么設(shè)置數(shù)據(jù)庫參數(shù)，針對這個(gè)問題，這篇文章詳細(xì)介紹了相對應(yīng)的分析和解答，希望可以幫助更多想解決這個(gè)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(huì)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(huì)話級別的參數(shù)

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(shè)置的參數(shù)，在數(shù)據(jù)庫重啟后，相關(guān)的參數(shù)也會(huì)失效；如果想讓參數(shù)永久生效，可以將參數(shù)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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