Как я могу оптимизировать свой запрос, это занимает слишком много времени в MySQL - PullRequest
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Как я могу оптимизировать свой запрос, это занимает слишком много времени в MySQL

0 голосов
/ 21 июня 2019

Здесь я выбираю данные с помощью запросов mysql, но на это уходит время около 10 секунд 20 секунд, даже если все столбцы проиндексированы.так что я новичок в оптимизации, поэтому, пожалуйста, помогите мне 

SELECT a.cname, 
       (SELECT status_name 
        FROM   persontype_status 
        WHERE  status = a.p3_status 
        LIMIT  1)                                                 AS 
       company_status_psp3, 
       a.curl, 
       a.cid, 
       a.pid, 
       a.addedbyuser, 
       a.no_of_emp, 
       ( CASE 
           WHEN a.lead_status > 0 
                AND ( a.status = 0 
                       OR a.status > 0 ) THEN (SELECT ( Max(Date(dateadded)) ) 
                                               FROM   d3_info 
                                               WHERE  cid = a.cid 
                                               GROUP  BY cid) 
           WHEN ( a.status > 0 
                  AND a.lead_status = 0 ) THEN (SELECT ( Min(Date(dateadded)) ) 
                                                FROM   sperson_info 
                                                WHERE  cid = a.cid 
                                                GROUP  BY cid) 
           ELSE 0 
         end )                                                    AS date_new, 
       a.rank, 
       a.lead_status, 
       a.status, 
       a.magid, 
       (SELECT pname 
        FROM   personinfo 
        WHERE  pid = a.pid)                                       AS pname, 
       p1_status, 
       Count(c.email_id)                                          AS total_mail, 
       Count(IF(s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                AND c.person_type = 'P1' 
                AND d.send_status = 1, c.email_id, NULL))         AS t_p1, 
       Count(IF(s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                AND c.person_type = 'P2' 
                AND d.send_status = 1, c.email_id, NULL))         AS t_p2, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P3' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p3, 
       Count(DISTINCT IF(c.person_type = 'P3' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p3_e, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P4' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p4, 
       Count(DISTINCT IF(c.person_type = 'P4' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p4_e, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P5' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p5, 
       Count(DISTINCT IF(c.person_type = 'P5' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p5_e, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P6' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p6, 
       Count(DISTINCT IF(c.person_type = 'P6' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p6_e, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P7' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p7, 
       Count(DISTINCT IF(c.person_type = 'P7' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p7_e, 
       Count(IF(( s.mail_type IN( 'First Mail', 'Reminder 1' ) 
                  AND c.person_type = 'P8' 
                  AND d.send_status = 1 ), c.email_id, NULL))     AS t_p8, 
       Count(DISTINCT IF(c.person_type = 'P8' 
                         AND c.email_id != '', c.email_id, NULL)) AS t_p8_e  FROM   mperson_companies a 
       INNER JOIN aperson_detail c 
               ON a.cid = c.cid 
                  AND a.pid = c.pid 
       LEFT JOIN compose d 
              ON c.email_id = d.receiver_email 
                 AND c.pid = d.pid 
       LEFT JOIN session_person s 
              ON d.session_id = s.session_id  WHERE  a.lead_status = 0 
       AND a.flag != 'q' 
       AND a.approval != 5 
       AND a.pid = 2832 
       AND a.rank > 1 
       AND c.email_id != ''  GROUP  BY a.cid  HAVING t_p1 = 2 
       AND t_p2 = 2 
       AND IF(t_p3_e = 1, t_p3 = 2, 1 = 1) 
       AND IF(t_p4_e = 1, t_p4 = 2, 1 = 1) 
       AND IF(t_p5_e = 1, t_p5 = 2, 1 = 1) 
       AND IF(t_p6_e = 1, t_p6 = 2, 1 = 1) 
       AND IF(t_p7_e = 1, t_p7 = 2, 1 = 1) 
       AND IF(t_p8_e = 1, t_p8 = 2, 1 = 1)  ORDER  BY date_new DESC;

1 Ответ

0 голосов
/ 21 июня 2019

Нужно видеть SHOW CREATE TABLE и EXPLAIN SELECT.

Между тем, этот 

    WHERE  a.lead_status = 0
      AND  a.flag != 'q'
      AND  a.approval != 5
      AND  a.pid = 2832
      AND  a.rank > 1
      AND  c.email_id != ''

просит о 

INDEX(lead_status, pid,   -- in either order
      flag, approval,     -- in either order
      rank)               -- last

и этом SELECT (Мин. (Дата(дата добавлена))) FROM sperson_info WHERE cid = a.cid GROUP BY cid)

не нужно включать GROUP BY cid, поскольку он вернет только один элемент.

И 

( a.status = 0  OR  a.status > 0 )

может быть просто 

a.status >= 0

Но какие значения существуют для status?Неравенства иногда менее эффективны, чем равенства.

И это 

       Count(IF(s.mail_type IN( 'First Mail', 'Reminder 1' )
                      AND  c.person_type = 'P2'
                AND  d.send_status = 1, c.email_id, NULL)
                     )

можно сократить до 

       SUM(   s.mail_type IN( 'First Mail', 'Reminder 1' )
         AND  c.person_type = 'P2'
         AND  d.send_status = 1 )

Может быть больше предложений;это может занять несколько итераций.

...