Tuning based on joins

Question

Hi,
I am having the joins like the following, it takes more time to give the result,
if i rearrange this joins will it give good performance for my query.
FROM EMP40_DETLICANT A INNER JOIN WF_RESOURCE_ENTITLE_MST B
     ON A.DETLICANT_ID = B.DETLICANT_ID INNER JOIN WF_PROCESS_TXN D
     ON A.DETLICANT_ID = D.DETLICANT_ID AND B.STAGE_ID = D.STAGE_ID LEFT JOIN DE_DETLICANT C
     ON A.DETLICANT_ID = C.DETLICANT_ID LEFT JOIN EMP10_DETLICATION E ON A.DETLICATION_ID=E.DETLICATION_ID
     LEFT JOIN EMP30_DETPRODUCTS DETPRODS ON DETPRODS.DETLICATION_ID=E.DETLICATION_ID
     AND DETPRODS.DETLICANT_ID = B.DETLICANT_ID LEFT JOIN EMP20_DETIMAGES F ON A.DETLICATION_ID=F.DETLICATION_ID
     AND TRIM(F.IMAGE_CLASSIFICATION_TYPE) = 'NA' INNER JOIN PA_PARAM_MST G ON G.CRITERIA4 = D.STAGE_STATUS) B)
     WHERE RNUM BETWEEN 1 AND 100;
Please advice
siva

Answer 1

And here is more readable (for me ;) ) version of your query.
SELECT *
FROM (
     SELECT B.*, ROWNUM RNUM
      FROM (
          SELECT DISTINCT B.DETLICANT_ID, A.DETLICATION_ID, A.FIRST_NAME, A.SURNAME,
               (SELECT STAGE_NAME
                 FROM WF_STAGE_MST
                 WHERE STAGE_ID = B.STAGE_ID
                  AND RECORD_STATUS='O') AS STAGE_NAME,
               B.WF_REFERENCE_NO, D.EXT_CALL_ID EXTERNALCALLTXNID, B.STAGE_ID,
               B.PATH_ID, B.TRANSITION_NO, C.IR_DETLICATION_ID, D.TRANSITION_STATE,
               D.FUNC_GROUP, E.PRIORITY_FLAG, G.CRITERIA2 STAGESTATUSDESCRIPTION,                E.DET_SOURCE_CODE, DETPRODS.PRODUCT_TYPE, F.IMAGE_ID,
               TO_CHAR(IN_TIME,'DD-MM-YYYY HH24:MM') IN_TIME,
               (SELECT
                 NVL(LTRIM(SUBSTR((SYSDATE - IN_TIME),8,3),0),0)||'D : '||
                 NVL(LTRIM(SUBSTR((SYSDATE - IN_TIME),12,2),0),0)||'H : '||
                 NVL(LTRIM(SUBSTR((SYSDATE - IN_TIME),15,2),0),0)||'M'
               FROM DUAL) AS AGE,
               D.RESOURCE_ID, D.RESOURCE_ID_OUT RESOURCEIDOUT, B.ASSIGNED_TO AS ASSIGNEDTO,
               (SELECT TO_TIMESTAMP(SYSDATE,'DD-MON-YY HH.MI.SS.FF9 AM') - IN_TIME FROM DUAL) AS DATEAGE,
                    A.DETLICANT_TYPE AS DETLICANT_TYPE, IN_TIME IN_TIME_FOR_SORTING,
                    (CASE
                         WHEN 1164474214516 < B.ET_NORMAL THEN 'N'
                         WHEN 1164474214516 < B.ET_WARNING THEN 'W'
                         ELSE 'E' END
                    ) AS SLA_STATUS
                FROM EMP40_DETLICANT A INNER JOIN WF_RESOURCE_ENTITLE_MST B ON A.DETLICANT_ID = B.DETLICANT_ID
                    INNER JOIN WF_PROCESS_TXN D ON A.DETLICANT_ID = D.DETLICANT_ID AND B.STAGE_ID = D.STAGE_ID                          LEFT JOIN DE_DETLICANT C  ON A.DETLICANT_ID = C.DETLICANT_ID
                    LEFT JOIN EMP10_DETLICATION E ON A.DETLICATION_ID = E.DETLICATION_ID
                    LEFT JOIN EMP30_DETPRODUCTS DETPRODS ON DETPRODS.DETLICATION_ID = E.DETLICATION_ID
                         AND DETPRODS.DETLICANT_ID = B.DETLICANT_ID
                    LEFT JOIN EMP20_DETIMAGES F ON A.DETLICATION_ID=F.DETLICATION_ID
                         AND TRIM(F.IMAGE_CLASSIFICATION_TYPE) = 'NA'
                    INNER JOIN PA_PARAM_MST G ON G.CRITERIA4 = D.STAGE_STATUS
               ) B
WHERE RNUM BETWEEN 1 AND 100;Peter D.