Mysql报错too many connections

查看当前连接情况

mysql> show variables like '%connections%';
+----------------------+-------+
| Variable_name        | Value |
+----------------------+-------+
| max_connections      | 500   |
| max_user_connections | 0     |
+----------------------+-------+
2 rows in set (0.01 sec)

查看用户连接情况

mysql> select * from performance_schema.users;
+------+---------------------+-------------------+
| USER | CURRENT_CONNECTIONS | TOTAL_CONNECTIONS |
+------+---------------------+-------------------+
| NULL |                  28 |            636237 |
| tony |                   2 |           5071859 |
| root |                   1 |                44 |
+------+---------------------+-------------------+
3 rows in set (0.00 sec)

修改最大连接数

mysql> set global max_connections=1000;
Query OK, 0 rows affected (0.00 sec)