2
나는이 쿼리의 속도를 높이는 데 도움을 받았으며이 테이블의 인덱스 중 일부가 제대로 설정되지 않았다고 생각한다. 나는 또한 그들이 모두 색인이있는 col에 함수가 적용된 b/c로 사용되지는 않을 것이라고 생각한다. 누구든지 내가 어떻게 이러한 테이블이나 쿼리를 최적화 할 수 볼 수 있습니까? requests 테이블은 3 개의 테이블 중 가장 큰 테이블이며 200k 개 이상의 레코드를 포함합니다. devices은 현재 ~ 500 개의 레코드에 저장되어 있으며 clients은 작아집니다.mysql 쿼리 최적화
검색어 :
explain extended SELECT MAX(Request.datetime) AS datetime, Device.id,
Device.client_id, Device.mac_address, Device.type, Device.manufacturer,
Device.model_number, Client.id, Client.email_address,
Request.device_id, Request.datetime, Request.ip_address
FROM livefi.devices AS Device
LEFT JOIN livefi.clients AS Client
ON (Client.id = Device.client_id)
INNER JOIN livefi.requests AS Request
ON (Request.device_id = Device.id)
GROUP BY Request.device_id, Request.client_id
+----+-------------+---------+--------+---------------------------------------------------------+---------------+---------+-------------------------+------+----------+---------------------------------+
| id | select_type | table | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+---------+--------+---------------------------------------------------------+---------------+---------+-------------------------+------+----------+---------------------------------+
| 1 | SIMPLE | Device | ALL | PRIMARY | NULL | NULL | NULL | 617 | 100.00 | Using temporary; Using filesort |
| 1 | SIMPLE | Client | eq_ref | PRIMARY | PRIMARY | 4 | livefi.Device.client_id | 1 | 100.00 | |
| 1 | SIMPLE | Request | ref | idx_device_id,inx_requests_deviceId_datetime_ip_address | idx_device_id | 5 | livefi.Device.id | 144 | 100.00 | Using where |
+----+-------------+---------+--------+---------------------------------------------------------+---------------+---------+-------------------------+------+----------+---------------------------------+
3 rows in set, 1 warning (0.04 sec)
테이블 :
CREATE TABLE `clients` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`email_address` varchar(100) DEFAULT NULL,
`mac_address` varchar(17) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `email_address` (`email_address`),
KEY `idx_mac_address` (`mac_address`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
CREATE TABLE `devices` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`client_id` int(10) unsigned DEFAULT NULL,
`mac_address` varchar(17) DEFAULT NULL,
`type` varchar(25) DEFAULT NULL,
`manufacturer` varchar(100) DEFAULT NULL,
`model_number` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `mac_address` (`mac_address`),
KEY `idx_mac_address` (`mac_address`),
KEY `fk_devices_clients1` (`client_id`),
CONSTRAINT `fk_devices_clients1` FOREIGN KEY (`client_id`) REFERENCES `clients` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=492 DEFAULT CHARSET=utf8
CREATE TABLE `requests` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`client_id` int(10) unsigned DEFAULT NULL,
`device_id` int(10) unsigned DEFAULT NULL,
`domain_id` int(10) unsigned DEFAULT NULL,
`ip_address` varchar(15) DEFAULT NULL,
`datetime` datetime DEFAULT NULL,
`gmt_offset` time DEFAULT NULL,
`request_method` varchar(15) DEFAULT NULL,
`url` text,
`http_protocol` varchar(20) DEFAULT NULL,
`http_status_code` varchar(20) DEFAULT NULL,
`request_size` int(10) unsigned DEFAULT '0',
`referer` text,
`user_agent` text,
`squid_cache_response` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `idx_client_id` (`client_id`),
KEY `idx_datetime` (`datetime`),
KEY `idx_device_id` (`device_id`),
KEY `idx_domain_id` (`domain_id`),
KEY `idx_id` (`id`),
KEY `idx_request_size` (`request_size`),
KEY `inx_requests_deviceId_datetime_ip_address` (`device_id`,`datetime`,`ip_address`),
CONSTRAINT `fk_requests_clients` FOREIGN KEY (`client_id`) REFERENCES `clients` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_requests_devices1` FOREIGN KEY (`device_id`) REFERENCES `devices` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
CONSTRAINT `fk_requests_domains1` FOREIGN KEY (`domain_id`) REFERENCES `domains` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=200523 DEFAULT CHARSET=utf8