记一次MySQL的优化案例

CREATE TABLE `xxx_info` (

  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT 'id',

  `user_id` bigint(20) unsigned NOT NULL DEFAULT '0' ,

  `group_id` bigint(20) unsigned NOT NULL DEFAULT '0',

  `nick_name` varchar(30) NOT NULL DEFAULT '' COMMENT '昵称',

  `is_del` tinyint(5) NOT NULL DEFAULT '0' COMMENT '0：数据有效、1：数据逻辑删除',

  `created_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',

  `updated_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '修改时间',

  PRIMARY KEY (`id`),

  KEY `idx_userid_groupid` (`user_id`,`group_id`)

) ENGINE=InnoDB AUTO_INCREMENT=1382032 DEFAULT CHARSET=utf8mb4 ;

 SELECT id, name,status FROM xxx_info WHERE user_id IN (670039223,'373149878') AND group_id = 1 AND is_del = 0;

set session optimizer_trace='enabled=on';

SELECT id, nick_name,is_del  FROM xxx_info WHERE user_id IN (670039223,'373149878') AND group_id = 1 AND is_del = 0;

select * from information_schema.optimizer_trace;

SELECT id, nick_name,is_del FROM xxx_info WHERE user_id IN (670039223,'373149878') AND group_id = 1 AND is_del = 0;

select * from information_schema.optimizer_trace;

set session optimizer_trace='enabled=off';