업데이트 쿼리 오라클 오랜 시간이 걸립니다

Question

나는 테이블의 행을 업데이 트하는 기능을 가지고, 업데이 트가 가장 낮은 생성 날짜를 선택하고 거기에 각각의 청구 날짜를 비교하고, 거기에 만든 날짜를 가장 생성 날짜 이 선택 항목을 기반으로 시작 날짜를 업데이트하려고합니다.

CREATE OR REPLACE FUNCTION OriginatedDate_update(total in Number) 
    RETURN VARCHAR2 
IS 
    intialCount Number(10); 
    temp Number(10); 
    count1 Number(10); 
BEGIN 
    SELECT COUNT(DISTINCT(p2.created_date)) INTO temp FROM discrepancy_grid_info p2 where billing_date is not null; 
    intialCount :=1; 
    temp :=temp+1; 
    WHILE intialCount < temp loop 
    update (SELECT * FROM discrepancy_grid_info p1 WHERE (intialCount-1) = (SELECT COUNT(DISTINCT(p2.created_date)) FROM discrepancy_grid_info p2 WHERE p2.created_date < p1.created_date) and billing_date is not null) f 
    set f.ORIGINATED_DATE=(SELECT MAX(p.ORIGINATED_DATE) FROM DISCREPANCY_GRID_INFO p where p.PRIM_ID=f.PRIM_ID AND p.PLAN_NAME=f.PLAN_NAME and p.PROCESS_INSTANCE_ID IN (select process_instance_id from audit_process where client_vendor_id in (select id from client_vendor where vendor_id=(select vendor_id from client_vendor where id=(select client_vendor_id from audit_process where process_instance_id=f.process_instance_id)) and client_id=(select client_id from client_vendor where id=(select client_vendor_id from audit_process where process_instance_id=f.process_instance_id)))) 
      and p.billing_date between add_months(trunc(f.billing_date,'mm'),-1) and last_day(add_months(trunc(f.billing_date,'mm'),-1)) and p.billing_date is not null and p.created_date < f.created_date group by p.PRIM_ID,p.PLAN_NAME) 
    where f.billing_date is not null; 
    DBMS_OUTPUT.PUT_LINE(SQL%ROWCOUNT); 
    count1 :=count1+SQL%ROWCOUNT;  
    intialCount :=intialCount+1; 
    end loop; 
    RETURN count1; 
END; 

Answer 1

실행 단지 ONE 쿼리

update 
    discrepancy_grid_info p1 
    -- WHERE (intialCount-1) = 
    -- (
    -- SELECT * FROM discrepancy_grid_info p1 
    --  WHERE (intialCount-1) = (
    --   SELECT COUNT(DISTINCT(p2.created_date)) 
    --   FROM discrepancy_grid_info p2 
    --   WHERE p2.created_date < p1.created_date 
    -- ) and */ 

set ORIGINATED_DATE=(
    .... rest of your query goes here 
) 
WHERE p1.billing_date is not null ; 

대신 루프에 어쩌면 같은 쿼리 수십, 수백, 수천의 횟수를 반복.
루프도 제거하십시오. 불필요합니다.
쿼리가 futrer 최적화 될 수 있지만이 간단한 변경은 huuuuuuuuge 개선을 제공해야합니다.