以下查詢花費時間(2.3s)執行。如何提高查詢執行的性能
SELECT *, COUNT(c2.id) AS c2__0
FROM countryMaster c, stateMaster s, cityMaster c2, categoryMaster c3, categoryMaster c4, product p
INNER JOIN user u ON ((u.id = p.user_id AND u.is_active = 1))
WHERE (p.category_id = c4.id
AND c2.id = p.x_area_id
AND c2.parent_id = s.id
AND s.parent_id = c.id AND c3.id IN ('1271')
AND c4.rgt = (c4.lft + 1)
AND c4.lft BETWEEN c3.lft AND c3.rgt AND p.status = 1)
GROUP BY c.id;
Explain:
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: c3
type: const
possible_keys: PRIMARY,lft_rgt_inx
key: PRIMARY
key_len: 4
ref: const
rows: 1
Extra: Using temporary; Using filesort
*************************** 2. row ***************************
id: 1
select_type: SIMPLE
table: p
type: ALL
possible_keys: INX_cmp_sx,status
key: NULL
key_len: NULL
ref: NULL
rows: 29958
Extra: Using where
*************************** 3. row ***************************
id: 1
select_type: SIMPLE
table: c4
type: eq_ref
possible_keys: PRIMARY,lft_rgt_inx
key: PRIMARY
key_len: 4
ref: yozoa1_live.p.category_id
rows: 1
Extra: Using where
*************************** 4. row ***************************
id: 1
select_type: SIMPLE
table: u
type: eq_ref
possible_keys: PRIMARY,is_active
key: PRIMARY
key_len: 4
ref: yozoa1_live.p.user_id
rows: 1
Extra: Using where
*************************** 5. row ***************************
id: 1
select_type: SIMPLE
table: c2
type: eq_ref
possible_keys: PRIMARY,parent_id
key: PRIMARY
key_len: 4
ref: yozoa1_live.p.x_area_id
rows: 1
Extra:
*************************** 6. row ***************************
id: 1
select_type: SIMPLE
table: s
type: eq_ref
possible_keys: PRIMARY,parent_id
key: PRIMARY
key_len: 4
ref: yozoa1_live.c2.parent_id
rows: 1
Extra:
*************************** 7. row ***************************
id: 1
select_type: SIMPLE
table: c
type: eq_ref
possible_keys: PRIMARY
key: PRIMARY
key_len: 4
ref: yozoa1_live.s.parent_id
rows: 1
Extra:
Show create table -
CREATE TABLE `categoryMaster` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`description` text NOT NULL,
`logo` varchar(255) NOT NULL,
`is_visible` tinyint(1) NOT NULL DEFAULT '1',
`is_featured` tinyint(1) NOT NULL DEFAULT '0',
`is_map` tinyint(1) NOT NULL DEFAULT '0',
`is_price_required` tinyint(1) NOT NULL DEFAULT '1',
`parent_id` int(11) NOT NULL DEFAULT '0',
`lft` int(11) NOT NULL DEFAULT '0',
`rgt` int(11) NOT NULL DEFAULT '0',
`level` tinyint(4) NOT NULL DEFAULT '0',
`sort_order` smallint(6) NOT NULL DEFAULT '0',
`product_count` int(11) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `lft_rgt_inx` (`lft`,`rgt`),
KEY `parent_id` (`parent_id`),
KEY `product_count` (`product_count`)
) ENGINE=MyISAM
CREATE TABLE `productMaster` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`description` longtext NOT NULL,
`sub_name` varchar(255) NOT NULL,
`sub_description` longtext NOT NULL,
`image` varchar(255) NOT NULL,
`category_id` int(11) NOT NULL,
`is_new` tinyint(1) NOT NULL DEFAULT '1',
`status` tinyint(1) NOT NULL DEFAULT '-1',
`user_id` int(11) NOT NULL,
`currency_main` varchar(4) NOT NULL DEFAULT 'MNT',
`price_original` double NOT NULL DEFAULT '0',
`price_global` double NOT NULL DEFAULT '0',
`attribute_value_ids` text,
`created_at` datetime DEFAULT NULL,
`updated_at` datetime DEFAULT NULL,
`confirmed_at` datetime DEFAULT NULL,
`duration` int(4) NOT NULL DEFAULT '7',
`rental_duration` varchar(50) DEFAULT NULL,
`buy_online` tinyint(1) NOT NULL DEFAULT '0',
`internal` tinyint(1) NOT NULL DEFAULT '0',
`delivery_status` smallint(1) NOT NULL DEFAULT '1'
`delivery_type` smallint(1) NOT NULL DEFAULT '1'
`phone_cell` varchar(50) DEFAULT NULL,
`phone_home` varchar(50) DEFAULT NULL,
`surname` varchar(100) DEFAULT NULL,
`x_area_id` int(11) NOT NULL,
`x_area_location_id` int(11) DEFAULT NULL,
`sublocality_id` int(11) DEFAULT NULL,
`product_posting_price` double NOT NULL,
`is_paid` tinyint(1) NOT NULL,
`product_posting_currency` varchar(3) NOT NULL,
`map_lat` double NOT NULL,
`map_lng` double NOT NULL,
`product_company_contact_info_id` int(11) NOT NULL,
`backup_status` tinyint(1) NOT NULL DEFAULT '4',
`is_scraped` tinyint(1) DEFAULT NULL,
`sources_id` int(3) NOT NULL,
`product_source_url` varchar(255) NOT NULL,
`country_id` int(4) NOT NULL,
`state_id` int(5) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `UNQ_cmp_icsu` (`id`,`category_id`,`status`,`user_id`),
KEY `country_id` (`country_id`),
KEY `state_id` (`state_id`),
KEY `INX_cmp_sx` (`status`,`x_area_id`),
KEY `status` (`status`),
FULLTEXT KEY `name` (`name`),
FULLTEXT KEY `attribute_value_ids` (`attribute_value_ids`)
) ENGINE=MyISAM
CREATE TABLE `cityMaster` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`parent_id` int(6) NOT NULL,
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`map_lat` double NOT NULL,
`map_lng` double NOT NULL,
`has_sublocality` tinyint(1) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
KEY `parent_id` (`parent_id`)
) ENGINE=MyISAM
CREATE TABLE `stateMaster` (
`id` int(6) NOT NULL AUTO_INCREMENT,
`parent_id` int(3) NOT NULL,
`name` varchar(255) NOT NULL,
`map_lat` double NOT NULL,
`map_lng` double NOT NULL,
PRIMARY KEY (`id`),
KEY `parent_id` (`parent_id`)
) ENGINE=MyISAM
CREATE TABLE `countryMaster` (
`id` int(3) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
`country_code` varchar(2) CHARACTER SET latin1 NOT NULL,
`map_lat` double NOT NULL,
`map_lng` double NOT NULL,
`is_active` tinyint(1) NOT NULL DEFAULT '1',
PRIMARY KEY (`id`)
) ENGINE=MyISAM
請指教我如何減少帶索引的查詢的執行時間。 也讓我知道爲什麼查詢解釋在ref列中顯示null? 也讓我知道優化查詢的步驟?
用戶表丟失? – hkulekci 2014-10-14 22:16:48
嘗試在productMaster中的x_area_id上添加索引。 – evanv 2014-11-08 16:15:17