修改Mysql最大链接数

最近使用Mysql数据库进行多编程操做时报错：ERROR 1040: Too many connections 。提示链接过多，检查发现Mysql的默认链接数为151，可根据实际状况进行修改。

一、查看最大链接数设置

mysql -uroot -p

MariaDB [(none)]>  show variables like 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 151   |
+-----------------+-------+
1 row in set (0.01 sec)

二、查看实际己使用的最大链接数

能够发现实际使用的链接数己达到最大链接数限制

MariaDB [(none)]> show global status like 'Max_used_connections';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| Max_used_connections | 152   |
+----------------------+-------+
1 row in set (0.01 sec)

三、根据实际须要修改最大链接数

MariaDB [(none)]>  set GLOBAL max_connections=4096; 
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]>  show variables like 'max_connections';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| max_connections | 4096  |
+-----------------+-------+
1 row in set (0.01 sec)

四、再次运行报错程序，检查己使用最大链接数

MariaDB [(none)]> show global status like 'Max_used_connections';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| Max_used_connections | 1002  |
+----------------------+-------+
1 row in set (0.01 sec)