需要幫助優化我的SQL查詢

Question

我需要優化以下查詢

select 
    DATE_FORMAT(traffic.stat_date, '%Y/%m'), 
    pt.promotion, 
    sum(traffic.voice_nat_onnet_mins - pt.promo_minutes_onnet) as total_onnet_mins, 
    sum(traffic.voice_nat_offnet_mins + traffic.voice_nat_landline_mins + traffic.voice_int_mins + traffic.voice_nng_mins + traffic.voice_not_rec_mins - pt.promo_minutes_offnet) as total_offnet_mins, 
    sum(traffic.sms_ptp_onnet_evts) as total_onnet_sms, 
    sum(traffic.sms_ptp_offnet_evts + traffic.sms_vas_pta_evts) as total_offnet_sms, 
    sum(traffic.dati_kb) as internet_kb 
from 
    stats_novercanet.mnp_prod_stat_outgoing_traffic traffic 
    INNER JOIN stats_novercanet.mnp_prod_stat_promotion_traffic pt 
    ON pt.id_source_user=traffic.id_source_user 
    INNER JOIN stats_novercanet.mnp_prod_stat_customer_first_signup fs 
    ON pt.id_source_user = fs.id_source_user 
where 
    traffic.stat_date between '2013-11-01' and '2013-11-30' 
    and traffic.stat_date >= (
    select min(ft.stat_date) 
    from stats_novercanet.mnp_prod_stat_promotion_traffic ft 
    where 
     traffic.id_source_user=ft.id_source_user 
     and (ft.sub_rev>0 or ft.ren_rev>0) 
     and pt.promotion=ft.promotion 
) 
    and pt.stat_date between '2013-11-01' and '2013-11-30' 
group by 
    DATE_FORMAT(traffic.stat_date, '%Y/%m'), 
    pt.promotion 
order by 
    DATE_FORMAT(traffic.stat_date, '%Y/%m'), 
    pt.promotion ** 

我已經使用這個查詢解釋的幫助，它向我展示了以下結果

+----+--------------------+---------+-------+------------------------------------------------+---------------------------------+---------+-----------------------------------------+--------+----------------------------------------------+ 
| id | select_type  | table | type | possible_keys         | key        | key_len | ref          | rows | Extra          | 
+----+--------------------+---------+-------+------------------------------------------------+---------------------------------+---------+-----------------------------------------+--------+----------------------------------------------+ 
| 1 | PRIMARY   | pt  | range | idx_prod_stat_pro_tra_stat_date,id_source_user | idx_prod_stat_pro_tra_stat_date | 4  | NULL         | 530114 | Using where; Using temporary; Using filesort | 
| 1 | PRIMARY   | fs  | ref | id_source_user         | id_source_user     | 5  | stats_novercanet.pt.id_source_user  |  1 | Using where; Using index      | 
| 1 | PRIMARY   | traffic | ref | stat_date,id_source_user      | id_source_user     | 5  | stats_novercanet.pt.id_source_user  |  60 | Using where         | 
| 2 | DEPENDENT SUBQUERY | ft  | ref | id_source_user,promotion      | id_source_user     | 5  | stats_novercanet.traffic.id_source_user |  93 | Using where         | 
+----+--------------------+---------+-------+------------------------------------------------+---------------------------------+---------+-----------------------------------------+--------+----------------------------------------------+ 

上優化任何幫助會很棒。我已經在id_source_user，stat_date和promotion上創建了索引，但是沒有運氣。也嘗試加入子查詢，但沒有運氣。

結果如下mnp_prod_stat_promotion_traffic。 * *

| mnp_prod_stat_promotion_traffic | CREATE TABLE `mnp_prod_stat_promotion_traffic` (
    `stat_date` date DEFAULT NULL, 
    `id_source_user` int(64) DEFAULT NULL, 
    `promotion` varchar(64) DEFAULT NULL, 
    `num_of_sub` int(64) DEFAULT NULL, 
    `num_of_ren` int(64) DEFAULT NULL, 
    `credit` float DEFAULT NULL, 
    `minutes` float DEFAULT NULL, 
    `kb` float DEFAULT NULL, 
    `sms` int(64) DEFAULT NULL, 
    `lbs` int(64) DEFAULT NULL, 
    `sub_rev` float DEFAULT NULL, 
    `ren_rev` float DEFAULT NULL, 
    `consumed_credit` float DEFAULT NULL, 
    `sim_type` varchar(32) DEFAULT NULL, 
    `price_plan` varchar(64) DEFAULT NULL, 
    `WiFi_mins` float DEFAULT NULL, 
    `over_min` float DEFAULT NULL, 
    `over_min_consumed` float DEFAULT NULL, 
    `over_sms` float DEFAULT NULL, 
    `over_sms_consumed` float DEFAULT NULL, 
    `over_data` float DEFAULT NULL, 
    `over_data_consumed` float DEFAULT NULL, 
    `promo_minutes_onnet` float DEFAULT NULL, 
    `promo_minutes_offnet` float DEFAULT NULL, 
    `promo_sms_onnet` int(64) DEFAULT NULL, 
    `promo_sms_offnet` int(64) DEFAULT NULL, 
    KEY `idx_prod_stat_pro_tra_stat_date` (`stat_date`), 
    KEY `id_source_user` (`id_source_user`), 
    KEY `promotion` (`promotion`) USING BTREE 
) ENGINE=MyISAM DEFAULT CHARSET=latin1 | 

Answer 1

多少結果你期望得到恢復。如果您知道例如您只希望返回一條記錄，那麼您可以使用LIMITS

當運行查詢時，它將搜索整個表中的記錄，但是如果您知道只有一個，兩個或三個結果返回那麼你可以限制。這將節省MySQL大量的時間，但是它又取決於你正在執行的結果的數量，你將不得不將它應用到你正在運行的表上。

此外，另一個技巧是檢查您正在使用什麼類型的表類型。看看這個網頁的更多信息：http://www.mysqltutorial.org/understand-mysql-table-types-innodb-myisam.aspx

另一個選擇是建立一個腳本來使用上面的現有查詢並將結果存儲在一個新表中，並且每個月通過cron運行腳本一次像午夜。我爲一個分析項目做了這個，並且它運作良好。