SHOW VARIABLES LIKE '%max_connections%'; 查看最大連接數設置
SHOW GLOBAL STATUS LIKE 'Max_used_connections'; 查看已使用連接數
set GLOBAL max_connections = 200;修改最大連接數
SELECT SUBSTRING_INDEX(HOST,":",1),COUNT(1) FROM information_schema.processlist GROUP BY SUBSTRING_INDEX(HOST,":",1) ; 產看不同ip佔用連接數