最近使用Mysql数据库进行多编程操作时报错:ERROR 1040: Too many connections 。提示连接过多,检查发现Mysql的默认连接数为151,可根据实际情况进行修改。
1、查看最大连接数设置
mysql -uroot -pMariaDB [(none)]> show variables like \'max_connections\';+-----------------+-------+| Variable_name | Value |+-----------------+-------+| max_connections | 151 |+-----------------+-------+1 row in set (0.01 sec)
2、查看实际己使用的最大连接数
可以发现实际使用的连接数己达到最大连接数限制
MariaDB [(none)]> show global status like \'Max_used_connections\';+----------------------+-------+| Variable_name | Value |+----------------------+-------+| Max_used_connections | 152 |+----------------------+-------+1 row in set (0.01 sec)
3、根据实际需要修改最大连接数
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)
4、再次运行报错程序,检查己使用最大连接数
MariaDB [(none)]> show global status like \'Max_used_connections\';+----------------------+-------+| Variable_name | Value |+----------------------+-------+| Max_used_connections | 1002 |+----------------------+-------+1 row in set (0.01 sec)