如何優化這個查詢，執行時間是40分鐘？

Question

select * from non_bidders_report_view 
where applicant_category_id =1314 
and applicant_status_id not in(10,11) 
and partner_id = 4 
and applicant_status_id <> 6 
and applicant_id not in (
          Select apb.applicant_id 
          from applicant_property_bids apb 
          inner join applicants a on 
          a.applicant_id=apb.applicant_id 
     where to_date(apb.bid_Date) >= to_date('30/4/2012','dd/mm/yyyy') 
     and to_date(apb.bid_Date) <= to_date('30/4/2015','dd/mm/yyyy') 
     and a.partner_id = 4 group by apb.applicant_Id 
     union 
     select aba.applicant_Id from Archive_Bid_Applicants aba 
     inner join applicants a on a.applicant_id=aba.applicant_id 
     where to_date(aba.bid_Date) >= to_date('30/4/2012','dd/mm/yyyy') 
     and to_date(aba.bid_Date) <= to_date('30/4/2015','dd/mm/yyyy') 
     and a.partner_id = 4 group by aba.applicant_Id 
     ); 

Answer 1

你可以試試這個查詢：

select * from non_bidders_report_view nb 
    where applicant_category_id = 1314 and partner_id = 4 
    and applicant_status_id not in (6, 10, 11) 
    and not exists (
     select 1 from applicant_property_bids abp 
     join applicants a on a.applicant_id=abp.applicant_id and a.partner_id=4 
      and abp.bid_Date between date '2012-04-30' and date '2015-04-30' 
     where abp.applicant_id = nb.applicant_id) 
    and not exists (
     select 1 from archive_bid_applicants aba 
     join applicants a on a.applicant_id=aba.applicant_id and a.partner_id=4 
      and aba.bid_Date between date '2012-04-30' and date '2015-04-30' 
     where aba.applicant_id = nb.applicant_id) 

的想法是擺脫group by和union這似乎是unnecesary這裏改變not in到not exists。

替代解決方案：

select * from non_bidders_report_view nb 
    where applicant_category_id = 1314 and partner_id = 4 
    and applicant_status_id not in (6, 10, 11) 
    and not exists (
     select 1 from (
      select applicant_id, bid_date from applicant_property_bids 
      union all 
      select applicant_id, bid_date from archive_bid_applicants 
     ) ab 
     join applicants a on a.applicant_id=ab.applicant_id and a.partner_id=4 
      and ab.bid_Date between date '2012-04-30' and date '2015-04-30' 
     where ab.applicant_id = nb.applicant_id) 

Answer 2

如果你有百萬計的數據，然後創建主鍵索引。它會增加你的表現。索引有助於加速數據檢索。在所有3個表上創建索引。