Also you need to help CBO with predicates like this:
SELECT ....~58 columns projected...
FROM (SELECT ....~60 columns projected
FROM "USER1"."BOS" "A2"
RIGHT OUTER JOIN
(SELECT ...~41 columns projected from A4 and A5
FROM "USER1"."CS" "A4"
RIGHT OUTER JOIN "USER1"."COX" "A5"
ON "A5"."EID" = "A4"."EID"
-- added a copy of the predicates:
where
"A5"."BI0" = :b1
OR "A5"."BI0" IS NOT NULL AND "A5"."CT1" = 'XXX'
OR "A5"."BI0" IS NULL AND "A5"."CT1" = 'YYY'
-- end
) "A3"
ON "A2"."BI" = "A3"."BID1"
AND "A2"."OID" = TO_NUMBER ("A3"."OID2")) "A1"
WHERE "COX"."BI0" = :b1
OR "BOS"."COl1" = :b2
AND "BOS"."I_DT" IS NULL
AND ( "COX"."BI0" IS NOT NULL
AND "COX"."CT1" = 'XXX'
OR "COX"."BI0" IS NULL AND "COX"."CT1" = 'YYY')
On Thu, Dec 24, 2020 at 5:46 PM Sayan Malakshinov <xt.and.r@xxxxxxxxx>
wrote:
Ok, I see the problem, you just need to replace both left joins to 'right
join', because as I said previously, all rows of the final resultset should
contain rows from COX.
Best regards,
Sayan Malakshinov
Oracle performance tuning expert
Oracle Database Developer Choice Award winner
Oracle ACE Associate
http://orasql.org
чт, 24 дек. 2020 г., 17:43 Lok P <loknath.73@xxxxxxxxx>:
I have just simply , replaced the FULL OUTER join with LEFT OUTER Join ,
something as below(with actual aliases) and ran it.
I am sensing like, i did something wrong , and not the way which you
thought of perhaps. Can you guide me here please, how you want me to test
it.
SELECT ....~58 columns projected...
FROM (SELECT ....~60 columns projected
FROM "USER1"."BOS" "A2"
*LEFT OUTER JOIN*
(SELECT ...~41 columns projected from A4 and A5
FROM "USER1"."CS" "A4"
*LEFT OUTER JOIN* "USER1"."COX" "A5"
ON "A5"."EID" = "A4"."EID") "A3"
ON "A2"."BI" = "A3"."BID1"
AND "A2"."OID" = TO_NUMBER ("A3"."OID2")) "A1"
WHERE "COX"."BI0" = :b1
OR "BOS"."COl1" = :b2
AND "BOS"."I_DT" IS NULL
AND ( "COX"."BI0" IS NOT NULL
AND "COX"."CT1" = 'XXX'
OR "COX"."BI0" IS NULL AND "COX"."CT1" = 'YYY')
On Thu, Dec 24, 2020 at 8:03 PM Sayan Malakshinov <xt.and.r@xxxxxxxxx>
wrote:
Can you show both original and modified queries?
