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我正在尝试优化特定查询以获得最快的时间。首先想到的是在不同/更好的硬件上尝试 Percona 5.6：

硬件（都具有相同的 RAID 控制器/缓存/电池）：
MySQL 服务器：4x300GB 10K SAS - RAID10（8 个 cpu 核心）
Percona SERVER：2x100GB Kingston SSD E100 - RAID1（24 个 cpu 核心）

在 MySQL 5.5.33 上，此查询平均执行 15 秒。
在 Percona 5.6.14 上，此查询平均执行 10 秒。 

        SELECT 
  a.*,
  d.cheap,
  d.name AS delivery_name,
  cu.name AS cuisine,
  IFNULL(a.sec_cuis, d.sec_cuis) AS sec_cuis,
  d.ticket,
  IF(
    TIMESTAMPDIFF(SECOND, a.online, NOW()) <= 120,
    1,
    0
  ) AS online,
  MAX(
    IF(
      (
        ts.time_from <= CURTIME() 
        OR (
          ts.time_to >= CURTIME() 
          AND ts.time_to < ts.time_from
        )
      ) 
      AND (
        ts.time_to >= CURTIME() 
        OR (
          ts.time_to < ts.time_from 
          AND ts.time_from <= CURTIME()
        )
      ) 
      OR (
        ts.time_to = ts.time_from 
        AND ts.time_to IS NOT NULL
      ),
      1,
      0
    )
  ) AS OPEN,
  COUNT(DISTINCT re.id) AS reviews_comm 
FROM
  cats AS c 
  JOIN time_schedule AS ts
  JOIN accounts AS a 
  JOIN deliveries AS d 
  JOIN cuisines AS cu 
  JOIN cuisines2cats AS cc 
  JOIN products AS p 
  JOIN specs AS s 
  LEFT JOIN reviews AS re ON re.account_id = a.id AND re.approved = '1' AND re.active = '1' 
WHERE ts.account_id = a.id 
  AND ts.day = 'tue' 
  AND a.active = '1' 
  AND (
    a.delivery_type = 1 
    OR a.delivery_type = '2'
  ) 
  AND d.id = a.delivery_id 
  AND (
    d.def_cuis = cu.id 
    OR a.def_cuis = cu.id
  ) 
  AND d.active = '1' 
  AND cc.cat_id = c.id 
  AND cc.cuisine_id = '3' 
  AND a.delivery_id = c.delivery_id 
  AND p.cat_id = c.id 
  AND s.product_id = p.id 
  AND s.account_id = a.id 
GROUP BY a.id 
ORDER BY RAND() ;

创建语句： 

/*Table structure for table `accounts` */

CREATE TABLE `accounts` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `delivery_id` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `delivery_type` tinyint(1) NOT NULL DEFAULT '1',
  `username` varchar(45) COLLATE utf8_unicode_ci DEFAULT NULL,
  `password` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL COMMENT 'SHA1',
  `phone` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `street` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `number` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
  `postcode` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
  `area_id` int(11) DEFAULT NULL,
  `city_id` int(11) NOT NULL DEFAULT '1',
  `mon_from` time DEFAULT NULL,
  `mon_to` time DEFAULT NULL,
  `tue_from` time DEFAULT NULL,
  `tue_to` time DEFAULT NULL,
  `wed_from` time DEFAULT NULL,
  `wed_to` time DEFAULT NULL,
  `thu_from` time DEFAULT NULL,
  `thu_to` time DEFAULT NULL,
  `fri_from` time DEFAULT NULL,
  `fri_to` time DEFAULT NULL,
  `sat_from` time DEFAULT NULL,
  `sat_to` time DEFAULT NULL,
  `sun_from` time DEFAULT NULL,
  `sun_to` time DEFAULT NULL,
  `def_cuis` int(11) DEFAULT NULL,
  `sec_cuis` varchar(250) COLLATE utf8_unicode_ci DEFAULT NULL,
  `edt` smallint(6) DEFAULT NULL,
  `ect` tinyint(2) DEFAULT NULL,
  `delay_edt` tinyint(4) DEFAULT NULL,
  `company_name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `doy` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `vat` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `activity` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `company_address` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `email` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `date_added` date DEFAULT NULL,
  `online_date` date DEFAULT NULL,
  `next_payment` date DEFAULT NULL,
  `payment_range` tinyint(4) DEFAULT NULL,
  `minimum_order` decimal(4,2) NOT NULL DEFAULT '0.00',
  `minimum_order_c` decimal(4,2) NOT NULL DEFAULT '0.00',
  `commission` tinyint(2) DEFAULT NULL,
  `aff_commission` tinyint(2) DEFAULT NULL,
  `supervisor_name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `supervisor_phone` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `contact_name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `contact_phone` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `dealer_name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `comments` text COLLATE utf8_unicode_ci,
  `catalogue_desc` text COLLATE utf8_unicode_ci,
  `distance` tinyint(1) NOT NULL DEFAULT '0',
  `lat` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `lng` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `polygon` text COLLATE utf8_unicode_ci,
  `invoice` enum('0','1') COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
  `ticket_account` tinyint(1) NOT NULL DEFAULT '0',
  `cheap_account` tinyint(1) NOT NULL DEFAULT '0',
  `call_notification` tinyint(1) NOT NULL DEFAULT '1',
  `closed_notification` tinyint(1) NOT NULL DEFAULT '1',
  `b2b_printrow` tinyint(1) NOT NULL DEFAULT '0',
  `superuser_id` int(11) DEFAULT NULL,
  `tech_issue` tinyint(2) NOT NULL DEFAULT '0' COMMENT '0=ok,1=tech_issue',
  `online` timestamp NULL DEFAULT NULL,
  `call_status` tinyint(1) NOT NULL DEFAULT '0',
  `call_action` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `call_counter` tinyint(1) NOT NULL DEFAULT '0',
  `failed_call_counter` tinyint(3) NOT NULL DEFAULT '0',
  `next_call` timestamp NULL DEFAULT NULL,
  `account_status` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `active` tinyint(1) NOT NULL DEFAULT '1',
  `permalink` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_keywords` varchar(150) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_description` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  `title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `brand_text` text COLLATE utf8_unicode_ci,
  `last_update` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `delivery_id` (`delivery_id`),
  KEY `delivery_type` (`delivery_type`),
  KEY `invoice` (`invoice`),
  KEY `active_delivery_type` (`active`,`delivery_type`)
) ENGINE=InnoDB AUTO_INCREMENT=1202 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

/*Table structure for table `cats` */

CREATE TABLE `cats` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `delivery_id` bigint(20) DEFAULT NULL,
  `cuisine_id` int(11) DEFAULT NULL,
  `section_id` int(11) NOT NULL DEFAULT '1',
  `name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `description` text COLLATE utf8_unicode_ci NOT NULL,
  `max_toppings` tinyint(1) NOT NULL DEFAULT '2',
  `fan_id` int(11) DEFAULT NULL,
  `ordering` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `delivery_id` (`delivery_id`),
  KEY `cuisine_id` (`cuisine_id`)
) ENGINE=InnoDB AUTO_INCREMENT=6756 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

/*Table structure for table `cuisines` */    

CREATE TABLE `cuisines` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `permalink` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_keywords` varchar(150) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_description` text COLLATE utf8_unicode_ci,
  `title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `comments` text COLLATE utf8_unicode_ci,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=35 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
/*Table structure for table `cuisines2cats` */    

CREATE TABLE `cuisines2cats` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `cuisine_id` int(11) NOT NULL,
  `cat_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `cuisine_id_cat_id` (`cuisine_id`,`cat_id`)
) ENGINE=InnoDB AUTO_INCREMENT=8436 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

/*Table structure for table `deliveries` */

CREATE TABLE `deliveries` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `user_name` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `password` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  `street` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `number` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
  `postcode` varchar(10) COLLATE utf8_unicode_ci DEFAULT NULL,
  `email` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  `invoice_email` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  `phone` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `area_id` int(11) DEFAULT NULL,
  `city_id` bigint(20) NOT NULL,
  `ticket` tinyint(4) NOT NULL DEFAULT '0',
  `cheap` tinyint(1) NOT NULL DEFAULT '1',
  `premium_until` date DEFAULT NULL,
  `mon_from` time DEFAULT NULL,
  `mon_to` time DEFAULT NULL,
  `tue_from` time DEFAULT NULL,
  `tue_to` time DEFAULT NULL,
  `wed_from` time DEFAULT NULL,
  `wed_to` time DEFAULT NULL,
  `thu_from` time DEFAULT NULL,
  `thu_to` time DEFAULT NULL,
  `fri_from` time DEFAULT NULL,
  `fri_to` time DEFAULT NULL,
  `sat_from` time DEFAULT NULL,
  `sat_to` time DEFAULT NULL,
  `sun_from` time DEFAULT NULL,
  `sun_to` time DEFAULT NULL,
  `edt` int(11) DEFAULT NULL COMMENT 'Estimate Delivery Time',
  `discount` tinyint(4) DEFAULT NULL,
  `biz_discount` tinyint(4) DEFAULT NULL,
  `invoice` enum('0','1') COLLATE utf8_unicode_ci NOT NULL DEFAULT '0',
  `minimum_order` decimal(4,2) DEFAULT NULL,
  `supervisor_name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `supervisor_phone` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `contact_name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `contact_phone` varchar(20) COLLATE utf8_unicode_ci DEFAULT NULL,
  `dealer_name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `closed_notification_phone` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `order_notification_phone` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `company_name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `doy` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `vat` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
  `activity` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `comments` text COLLATE utf8_unicode_ci,
  `def_cuis` int(11) DEFAULT NULL,
  `sec_cuis` varchar(250) COLLATE utf8_unicode_ci DEFAULT NULL,
  `commission` tinyint(2) NOT NULL,
  `aff_commission` tinyint(2) DEFAULT NULL,
  `b2b_autoprint` tinyint(1) NOT NULL DEFAULT '1',
  `b2b_showpopup` tinyint(1) NOT NULL DEFAULT '1',
  `b2b_printrow` tinyint(4) NOT NULL DEFAULT '0',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  `permalink` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_keywords` varchar(150) COLLATE utf8_unicode_ci DEFAULT NULL,
  `meta_description` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  `title` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `brand_text` text COLLATE utf8_unicode_ci,
  PRIMARY KEY (`id`),
  KEY `id_active` (`id`,`active`)
) ENGINE=InnoDB AUTO_INCREMENT=444 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

/*Table structure for table `products` */

CREATE TABLE `products` (
  `id` int(8) NOT NULL AUTO_INCREMENT,
  `cat_id` int(8) DEFAULT NULL,
  `delivery_id` int(8) DEFAULT NULL,
  `name` varchar(100) COLLATE utf8_unicode_ci DEFAULT NULL,
  `description` text COLLATE utf8_unicode_ci,
  `new_product` tinyint(4) NOT NULL DEFAULT '0',
  `vegetarian` tinyint(1) NOT NULL DEFAULT '0',
  `spicy` tinyint(1) NOT NULL DEFAULT '0',
  `promo` tinyint(1) NOT NULL DEFAULT '0',
  `upsell` tinyint(1) NOT NULL DEFAULT '0',
  `ordering` smallint(6) DEFAULT NULL,
  `max_toppings` tinyint(4) DEFAULT NULL,
  `free_toppings` tinyint(4) NOT NULL DEFAULT '0',
  `comments` text COLLATE utf8_unicode_ci,
  `date_added` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `dont_allow_extra_topps` tinyint(1) NOT NULL DEFAULT '0',
  `fan_id` int(11) DEFAULT NULL,
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`id`),
  KEY `cat_id` (`cat_id`),
  KEY `delivery_id` (`delivery_id`),
  KEY `active` (`active`),
  KEY `max_toppings` (`max_toppings`),
  KEY `free_toppings` (`free_toppings`)
) ENGINE=InnoDB AUTO_INCREMENT=41487 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

/*Table structure for table `specs` */

CREATE TABLE `specs` (
  `id` int(8) NOT NULL AUTO_INCREMENT,
  `product_id` int(8) DEFAULT NULL,
  `account_id` int(8) DEFAULT NULL,
  `pan_id` int(8) DEFAULT NULL,
  `size_id` int(8) DEFAULT NULL,
  `price` decimal(5,2) DEFAULT NULL,
  `topping_price` decimal(4,2) DEFAULT NULL,
  `available` tinyint(1) NOT NULL DEFAULT '1',
  `mon_from` time DEFAULT NULL,
  `mon_to` time DEFAULT NULL,
  `tue_from` time DEFAULT NULL,
  `tue_to` time DEFAULT NULL,
  `wed_from` time DEFAULT NULL,
  `wed_to` time DEFAULT NULL,
  `thu_from` time DEFAULT NULL,
  `thu_to` time DEFAULT NULL,
  `fri_from` time DEFAULT NULL,
  `fri_to` time DEFAULT NULL,
  `sat_from` time DEFAULT NULL,
  `sat_to` time DEFAULT NULL,
  `sun_from` time DEFAULT NULL,
  `sun_to` time DEFAULT NULL,
  `bank_from` time DEFAULT NULL,
  `bank_to` time DEFAULT NULL,
  `vat` decimal(4,2) DEFAULT NULL,
  `featured` tinyint(1) NOT NULL DEFAULT '0',
  `extension` varchar(5) COLLATE utf8_unicode_ci DEFAULT NULL,
  `active` tinyint(1) NOT NULL DEFAULT '0',
  `existing` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`id`),
  KEY `pan_id` (`pan_id`),
  KEY `size_id` (`size_id`),
  KEY `topping_price` (`topping_price`),
  KEY `available` (`available`),
  KEY `active` (`active`),
  KEY `price` (`price`),
  KEY `existing` (`existing`),
  KEY `account_id_product_id` (`account_id`,`product_id`)
) ENGINE=InnoDB AUTO_INCREMENT=242078 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci ROW_FORMAT=COMPRESSED;

/*Table structure for table `time_schedule` */

CREATE TABLE `time_schedule` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `account_id` int(11) NOT NULL,
  `day` varchar(3) COLLATE utf8_unicode_ci NOT NULL,
  `time_from` time DEFAULT NULL,
  `time_to` time DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `account_id` (`account_id`,`day`)
) ENGINE=InnoDB AUTO_INCREMENT=5357 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

解释： 

MySQL 5.5.32 Explain:
+----+-------------+-------+--------+------------------------------------------+------------+---------+----------------------------------+------+---------------------------------+
| id | select_type | table | type   | possible_keys                            | key        | key_len | ref                              | rows | Extra                           |
+----+-------------+-------+--------+------------------------------------------+------------+---------+----------------------------------+------+---------------------------------+
|  1 | SIMPLE      | cc    | ref    | cuisine_id,cat_id                        | cuisine_id | 4       | const                            |  213 | Using temporary; Using filesort |
|  1 | SIMPLE      | c     | eq_ref | PRIMARY,delivery_id                      | PRIMARY    | 8       | delivera_deliveras.cc.cat_id     |    1 | Using where                     |
|  1 | SIMPLE      | p     | ref    | PRIMARY,cat_id                           | cat_id     | 5       | delivera_deliveras.c.id          |    3 | Using where; Using index        |
|  1 | SIMPLE      | s     | ref    | product_id,account_id                    | product_id | 5       | delivera_deliveras.p.id          |    4 | Using where                     |
|  1 | SIMPLE      | a     | eq_ref | PRIMARY,delivery_id,delivery_type,active | PRIMARY    | 8       | delivera_deliveras.s.account_id  |    1 | Using where                     |
|  1 | SIMPLE      | d     | eq_ref | PRIMARY,active                           | PRIMARY    | 8       | delivera_deliveras.a.delivery_id |    1 | Using where                     |
|  1 | SIMPLE      | re    | ref    | account_id,active,approved               | account_id | 4       | delivera_deliveras.a.id          |    1 |                                 |
|  1 | SIMPLE      | ts    | ref    | account_id,day                           | account_id | 4       | delivera_deliveras.a.id          |    2 | Using where                     |
|  1 | SIMPLE      | cu    | ALL    | PRIMARY                                  | NULL       | NULL    | NULL                             |   34 | Using where; Using join buffer  |
+----+-------------+-------+--------+------------------------------------------+------------+---------+----------------------------------+------+---------------------------------+



Percona 5.6.14 Explain:
+----+-------------+-------+--------+--------------------------------------------------+------------+---------+-------------------------+------+------------------------------------------------+
| id | select_type | table | type   | possible_keys                                    | key        | key_len | ref                     | rows | Extra                                          |
+----+-------------+-------+--------+--------------------------------------------------+------------+---------+-------------------------+------+------------------------------------------------+
|  1 | SIMPLE      | cc    | ref    | cuisine_id,cat_id                                | cuisine_id | 4       | const                   |  213 | Using temporary; Using filesort                |
|  1 | SIMPLE      | c     | eq_ref | PRIMARY,delivery_id                              | PRIMARY    | 8       | perconadb.cc.cat_id     |    1 | Using where                                    |
|  1 | SIMPLE      | p     | ref    | PRIMARY,cat_id                                   | cat_id     | 5       | perconadb.c.id          |    3 | Using where; Using index                       |
|  1 | SIMPLE      | s     | ref    | product_id,account_id                            | product_id | 5       | perconadb.p.id          |    2 | Using where                                    |
|  1 | SIMPLE      | a     | eq_ref | PRIMARY,delivery_id,delivery_type,invoice,active | PRIMARY    | 8       | perconadb.s.account_id  |    1 | Using where                                    |
|  1 | SIMPLE      | re    | ref    | account_id,active,approved                       | account_id | 4       | perconadb.a.id          |    1 | Using where                                    |
|  1 | SIMPLE      | d     | eq_ref | PRIMARY,active                                   | PRIMARY    | 8       | perconadb.a.delivery_id |    1 | Using where                                    |
|  1 | SIMPLE      | ts    | ref    | account_id,day                                   | account_id | 4       | perconadb.a.id          |    3 | Using index condition; Using where             |
|  1 | SIMPLE      | cu    | ALL    | PRIMARY                                          | NULL       | NULL    | NULL                    |   32 | Range checked for each record (index map: 0x1) |
+----+-------------+-------+--------+--------------------------------------------------+------------+---------+-------------------------+------+------------------------------------------------+

Percona my.cnf: 

[mysqld]

# GENERAL #
user                           = mysql
default_storage_engine         = MyISAM
sql-mode                       = NO_ENGINE_SUBSTITUTION
performance_schema             = OFF
back_log                       = 2000
thread_handling                = pool-of-threads
tmpdir                         = /dev/shm

# MyISAM #
key_buffer_size                = 256M
#myisam_recover                 = BACKUP,FORCE
myisam_sort_buffer_size        = 128M
group_concat_max_len           = 4096
max_seeks_for_key              = 1000
myisam_use_mmap                = 1

# SAFETY #
max_allowed_packet             = 1G
max_connect_errors             = 1000000
local-infile                   = 0

# CACHES AND LIMITS #
tmp_table_size                 = 256M
max_heap_table_size            = 256M
query_cache_type               = 1
query_cache_size               = 128M
query_cache_limit              = 6M
query_cache_min_res_unit       = 2K
max_connections                = 275
max_user_connections           = 250
thread_cache_size              = 1000
open_files_limit               = 50K
table_definition_cache         = 4K
table_open_cache               = 10K
join_buffer_size               = 4M
sort_buffer_size               = 4M
read_buffer_size               = 2M
read_rnd_buffer_size           = 2M

#optimizer_switch='mrr=on,mrr_cost_based=off,batched_key_access=on'

# INNODB #
sysdate_is_now                 = 1
innodb                         = FORCE
innodb_strict_mode             = 1
innodb_flush_method            = O_DIRECT
innodb_log_files_in_group      = 2
innodb_log_file_size           = 256M
innodb_flush_log_at_trx_commit = 2
innodb_file_per_table          = 1
innodb_buffer_pool_size        = 6G
innodb_read_io_threads         = 16
innodb_write_io_threads        = 16
innodb_io_capacity             = 10000
innodb_log_buffer_size         = 32M
innodb_file_format             = Barracuda
max_prepared_stmt_count        = 1048560
innodb_purge_threads           = 4
innodb_sched_priority_cleaner  = 39
innodb_adaptive_hash_index_partitions = 64

# Time-out's #
connect_timeout=30
interactive_timeout=360
wait_timeout=360

在应用建议的索引并运行 DRapp 提供的查询后进行说明： 

+----+-------------+------------+--------+----------------------------------------------------------------+----------------------------+---------+----------------------------+------+-----------------------------------------------------+
| id | select_type | table      | type   | possible_keys                                                  | key                        | key_len | ref                        | rows | Extra                                               |
+----+-------------+------------+--------+----------------------------------------------------------------+----------------------------+---------+----------------------------+------+-----------------------------------------------------+
|  1 | PRIMARY     | <derived2> | ALL    | NULL                                                           | NULL                       | NULL    | NULL                       | 3367 | Using temporary; Using filesort                     |
|  1 | PRIMARY     | a          | eq_ref | PRIMARY,delivery_id,delivery_type,invoice,active_delivery_type | PRIMARY                    | 8       | PreQuery.id                |    1 | Using where                                         |
|  1 | PRIMARY     | re         | ref    | account_id_approved_active                                     | account_id_approved_active | 6       | PreQuery.id,const,const    |    1 | Using where; Using index                            |
|  1 | PRIMARY     | d          | eq_ref | PRIMARY,id_active                                              | PRIMARY                    | 8       | perconadb.a.delivery_id    |    1 | Using where                                         |
|  1 | PRIMARY     | c          | ref    | PRIMARY,delivery_id                                            | delivery_id                | 9       | perconadb.a.delivery_id    |    7 | Using where; Using index                            |
|  1 | PRIMARY     | cc         | ref    | cuisine_id_cat_id                                              | cuisine_id_cat_id          | 8       | const,perconadb.c.id       |    1 | Using where; Using index                            |
|  1 | PRIMARY     | p          | ref    | PRIMARY,cat_id                                                 | cat_id                     | 5       | perconadb.c.id             |    3 | Using where; Using index                            |
|  1 | PRIMARY     | s          | ref    | account_id_product_id                                          | account_id_product_id      | 10      | PreQuery.id,perconadb.p.id |    1 | Using where; Using index                            |
|  1 | PRIMARY     | cu         | ALL    | PRIMARY                                                        | NULL                       | NULL    | NULL                       |   32 | Range checked for each record (index map: 0x1)      |
|  2 | DERIVED     | <derived3> | ALL    | NULL                                                           | NULL                       | NULL    | NULL                       | 3367 | Using temporary; Using filesort                     |
|  2 | DERIVED     | ts1        | ref    | account_id                                                     | account_id                 | 15      | JustAccounts.id,const      |    1 | Using index condition                               |
|  3 | DERIVED     | a          | range  | PRIMARY,delivery_id,delivery_type,invoice,active_delivery_type | active_delivery_type       | 2       | NULL                       |  481 | Using index condition; Using where; Using temporary |
|  3 | DERIVED     | d          | eq_ref | PRIMARY,id_active                                              | PRIMARY                    | 8       | perconadb.a.delivery_id    |    1 | Using where                                         |
|  3 | DERIVED     | c          | ref    | PRIMARY,delivery_id                                            | delivery_id                | 9       | perconadb.a.delivery_id    |    7 | Using where; Using index                            |
|  3 | DERIVED     | cc         | ref    | cuisine_id_cat_id                                              | cuisine_id_cat_id          | 8       | const,perconadb.c.id       |    1 | Using where; Using index                            |
+----+-------------+------------+--------+----------------------------------------------------------------+----------------------------+---------+----------------------------+------+-----------------------------------------------------+
4

1 回答 1

0

我将全力以赴，看看是否有任何帮助......首先，为了有利于查询条件，我首先将以下索引添加到相应的表中。通过拥有多个键列，而不仅仅是单个键可以显着提高性能。

TABLE          INDEX
Accounts       (Active, DeliveryType)
Time_Schedule  (account_id, day)
Deliveries     (id, active)
cuisines2cats  (cuisine_id, cat_id )
Reviews        (account_id, approved, active )

ON the specs table, I didn't see the account_id as part of the table structure... however, if it SHOULD be there, I would have an index ON
Specs          (account_id, product_id )

接下来，在您的查询中，您有一些基于活动和交付类型状态的条件 = 例如：“1”或“2”。这些是数字字段。您应该将它们分别保留为 1 和 2，这样就不必进行数据类型转换来进行比较。

仅在索引上尝试上述方法。检查任何性能改进。

根据我们的外部努力，只是想提供最终的工作查询。

SELECT 
  FQ.*,
  COUNT(DISTINCT re.id) AS Reviews_Comm 
FROM
  (SELECT 
    a.*,
    IF(
      JustTimes.account_id IS NULL,
      "YES",
      "no"
    ) AS OPEN,
    d.cheap,
    d.name AS delivery_name,
    cu.name AS cuisine,
    IFNULL(a.sec_cuis, d.sec_cuis) AS SECONDARY_CUIS,
    d.ticket,
    IF(
      TIMESTAMPDIFF(SECOND, a.online, NOW()) <= 120,
      1,
      0
    ) AS SECONDARY_ONLINE 
  FROM
    cuisines2cats cc 
    JOIN cuisines AS cu 
      ON cc.cuisine_id = cu.id 
    JOIN cats c 
      ON cc.cat_id = c.id 
    JOIN products p 
      ON c.id = p.cat_id
      AND p.active = 1 
    JOIN specs s 
      ON p.id = s.product_id 
      AND s.active = 1 
    JOIN accounts a 
      ON s.account_id = a.id 
      AND c.delivery_id = a.delivery_id 
      AND a.Active = 1 
      AND a.Delivery_type IN (1, 2) 
    JOIN deliveries d 
      ON a.delivery_id = d.id 
      AND d.active = 1 
    LEFT JOIN 
      (SELECT DISTINCT 
        ts.account_id 
      FROM
        time_schedule ts 
      WHERE ts.day = 'mon' 
        AND ts.time_from IS NOT NULL 
        AND ts.time_to IS NOT NULL 
        AND (
          (ts.time_from = ts.time_to) 
          OR (
            ts.time_from <= NOW() 
            AND NOW() <= ts.time_to
          ) 
          OR (
            ts.time_to < ts.time_from 
            AND NOT (ts.time_to < NOW()) 
            AND NOW() < ts.time_from
          )
        )) AS JustTimes 
      ON a.id = JustTimes.account_id 
  WHERE cc.cuisine_id = 3 
    AND cu.id IN (a.def_cuis, d.def_cuis)) AS FQ 
  LEFT JOIN reviews re 
    ON FQ.id = re.account_id 
    AND re.approved = 1 
    AND re.active = 1 
GROUP BY FQ.id 
ORDER BY RAND();
于 2013-11-08T19:06:05.853 回答