我试图提高这个查询的性能可以帮我解决这个问题

Question

查询

select DISTINCT subscriber_data.* 
from subscriber_data, entities
where entities.id in 
(
   2,3,4,5,6,7,8,9,10,11,12,13,14,
   15,16,17,18,19,20,21,22,23,24,25,
   26,27,28,29,30,31,32,33,34,35,36,37,38,39,1
) 
and Lower( subscriber_data.status) in ( 'active','expired')
and (subscriber_data.entity_uid = entities.channel_uid 
and subscriber_data.channel_id = entities.channel_id) 
and Lower( subscriber_data.status) in ( 'active','expired')
order by subscriber_data.land_size desc LIMIT 0,10

Answer 1

首先，在没有distinct的情况下重写查询并修复您的数据，以便status具有统一的大小写：

select sd.* 
from subscriber_data sd
where exists (select 1
              from entities e
              where e.id in (2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,
                             26,27,28,29,30,31,32,33,34,35,36,37,38,39,1
                            ) and 
                   sd.entity_uid = e.channel_uid  and
                   sd.channel_id = e.channel_id
             ) and
      sd.status in ( 'active', 'expired')
order by sd.land_size desc
LIMIT 0, 10;

然后添加以下索引：subscriber_data(status, land_size, entity_uid, channel_id)和entities(channel_uid, channel_id, id)。