我的查询导致 mysqlid CPU 使用率达到 99%，我想简化查询

Question

这是我的查询：

SELECT DISTINCT (game.game_id) 
AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
AS bet_type
FROM game
LEFT JOIN kiosk_to_game ON ( kiosk_to_game.game_id = game.game_id ) 
LEFT JOIN game_bet_settings ON ( game_bet_settings.game_id = game.game_id ) 
LEFT JOIN game_link ON ( game_link.game_id1 = game.game_id
OR game_link.game_id2 = game.game_id ) 
AND game.game_id !=  ''
AND game.game_winner =  '0'
AND game.game_open_bet_time <=  '2014-02-21 12:12:48'
AND game.game_close_bet_time >=  '2014-02-21 12:12:48'
AND kiyosuku_to_game.kiyosuku_id =  '1'
AND game.game_is_active =  '1'
AND game_bet_settings.is_disabled !=1
AND (game_link.is_linked IS NULL OR game_link.is_linked =1)
ORDER BY game.game_start_time ASC 

我认为罪魁祸首可能是：

SELECT DISTINCT (game.game_id) 
AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
AS bet_type

任何人都可以将此查询简化为更有效的查询吗？

这是 sql 进程的图像： https://lh5.googleusercontent.com/--BsUDk8jLnY/UwbKFiCjZCI/AAAAAAAAAi4/MXCQFhs4PeU/w496-h216-no/sqlquery.png

这是我的一些表索引：

游戏

PRIMARY - game_id

游戏链接

PRIMARY - game_link_id   
game_id1 - game_id1, game_id2

game_bet_settings

PRIMARY - game_bet_settings_id
game_id - game_id

Answer 1

您可以尝试添加此索引：

game(game_winner, is_active, open_bet_time, close_bet_time, game_id);

但是，罪魁祸首可能是：

LEFT JOIN game_link ON ( game_link.game_id1 = game.game_id OR game_link.game_id2 = game.game_id ) 

or 的查询很难优化。

尝试在没有此条件的情况下运行您的查询：

SELECT DISTINCT (game.game_id) 
AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
AS bet_type
FROM game
LEFT JOIN kiosk_to_game ON ( kiosk_to_game.game_id = game.game_id ) 
LEFT JOIN game_bet_settings ON ( game_bet_settings.game_id = game.game_id ) 
LEFT JOIN game_link ON ( game_link.game_id1 = game.game_id ) 
AND game.game_id !=  ''
AND game.game_winner =  '0'
AND game.game_open_bet_time <=  '2014-02-21 12:12:48'
AND game.game_close_bet_time >=  '2014-02-21 12:12:48'
AND kiyosuku_to_game.kiyosuku_id =  '1'
AND game.game_is_active =  '1'
AND game_bet_settings.is_disabled !=1
AND (game_link.is_linked IS NULL OR game_link.is_linked =1)
ORDER BY game.game_start_time ASC 

如果这在合理的时间内有效，则尝试将两个查询合并在一起（每个条件一个）。

编辑：

联合看起来像：

(SELECT DISTINCT (game.game_id) 
 AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
 AS bet_type
 FROM game
 LEFT JOIN kiosk_to_game ON ( kiosk_to_game.game_id = game.game_id ) 
 LEFT JOIN game_bet_settings ON ( game_bet_settings.game_id = game.game_id ) 
 LEFT JOIN game_link ON ( game_link.game_id1 = game.game_id ) 
 AND game.game_id !=  ''
 AND game.game_winner =  '0'
 AND game.game_open_bet_time <=  '2014-02-21 12:12:48'
 AND game.game_close_bet_time >=  '2014-02-21 12:12:48'
 AND kiyosuku_to_game.kiyosuku_id =  '1'
 AND game.game_is_active =  '1'
 AND game_bet_settings.is_disabled !=1
 AND (game_link.is_linked IS NULL OR game_link.is_linked =1)
)
UNION
(SELECT DISTINCT (game.game_id) 
 AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
 AS bet_type
 FROM game
 LEFT JOIN kiosk_to_game ON ( kiosk_to_game.game_id = game.game_id ) 
 LEFT JOIN game_bet_settings ON ( game_bet_settings.game_id = game.game_id ) 
 LEFT JOIN game_link ON ( game_link.game_id2 = game.game_id ) 
 AND game.game_id !=  ''
 AND game.game_winner =  '0'
 AND game.game_open_bet_time <=  '2014-02-21 12:12:48'
 AND game.game_close_bet_time >=  '2014-02-21 12:12:48'
 AND kiyosuku_to_game.kiyosuku_id =  '1'
 AND game.game_is_active =  '1'
 AND game_bet_settings.is_disabled !=1
 AND (game_link.is_linked IS NULL OR game_link.is_linked =1)
)
ORDER BY game_start_time ASC

Answer 2

我建议将查询放置条件重新组合到子查询以限制记录数量。

SELECT DISTINCT (game.game_id) 
AS gid, game_link.is_linked, game_link.game_id1, game_bet_settings.bet_type_id 
AS bet_type
FROM (select * from game
      where
         game.game_id !=  ''
         AND game.game_winner =  '0'
         AND game.game_open_bet_time <=  '2014-02-21 12:12:48'
         AND game.game_close_bet_time >=  '2014-02-21 12:12:48'
         AND game.game_is_active =  '1'
     )
LEFT JOIN kiosk_to_game ON ( kiosk_to_game.game_id = game.game_id ) 
LEFT JOIN game_bet_settings ON ( game_bet_settings.game_id = game.game_id ) 
LEFT JOIN game_link ON ( game_link.game_id1 = game.game_id
OR game_link.game_id2 = game.game_id ) 
AND kiyosuku_to_game.kiyosuku_id =  '1'
AND (game_link.is_linked IS NULL OR game_link.is_linked =1)
ORDER BY game.game_start_time ASC