Query takes lots of time to execute how to minizie

Question

Hi ALL,
I have a query like this which takes atleat 3 mins to execute how to optimiized the code from the below query
how to minimize the time
SELECT
PRO.PROJECT_NAME "Project Name",
POBJ.NAME "Object Name",
X."Major" "Internal_Major",
X."Minor" "Internal_Minor",
X."Normalized" "Internal_Normalized",
TRUNC(X."IDR",2) "Internal Defect Rate",
Y."Major" "External_Major",
Y."Minor" "External_Minor",
Y."Normalized" "External_Normalized",
TRUNC(Y."EDR",2) "External_Defect_Rate",
PRO.ID "PRO_ID",
POBJ.ID "POBJ_ID"
FROM
PROJECTS PRO, PROJECT_OBJECTS POBJ,
(SELECT
MN."PRO_ID",
MN."POBJ_ID",
MN."Major",
MN."Minor",
MN."Normalized",
DR."IDR_PRO_ID",
DR."IDR_POBJ_ID",
DR."IDR"
FROM IDR_TEST DR FULL OUTER JOIN MAJOR_MINOR_NORMALIZED MN
ON
MN."PRO_ID" = DR."IDR_PRO_ID" AND
MN."POBJ_ID" = DR."IDR_POBJ_ID") X,
(SELECT
EE."PRO_ID" E_PRO_ID,
EN."PRO_ID" EN_PRO_ID,
EE."POBJ_ID" E_POBJ_ID,
EN."POBJ_ID" EN_POBJ_ID,
EN."Major",
EN."Minor",
EN."Normalized",
EN."Normalized" / DECODE(EE."External_Effort",0,NULL,EE."External_Effort") "EDR"
FROM
EXTR_MAJOR_MINOR_NORMALIZED EN FULL OUTER JOIN EXTERNAL_EFFORT EE
ON
EE."PRO_ID" = EN."PRO_ID" AND
EE."POBJ_ID" = EN."POBJ_ID") Y
WHERE
PRO.ID = :P1_PROJECTS AND
PRO.ID = POBJ.PRO_ID AND
:P1_PROJECTS = DECODE(X.PRO_ID,NULL,:P1_PROJECTS,X.PRO_ID) AND
:P1_PROJECTS = DECODE(X.IDR_PRO_ID,NULL,:P1_PROJECTS,X.IDR_PRO_ID) AND
POBJ.ID = DECODE(X.POBJ_ID,NULL,POBJ.ID,X.POBJ_ID) AND
POBJ.ID = DECODE(X.IDR_POBJ_ID,NULL,POBJ.ID,X.IDR_POBJ_ID)
AND
:P1_PROJECTS = DECODE(Y.E_PRO_ID(+),NULL,:P1_PROJECTS,Y.E_PRO_ID(+)) AND
:P1_PROJECTS = DECODE(Y.EN_PRO_ID(+),NULL,:P1_PROJECTS,Y.EN_PRO_ID(+)) AND
POBJ.ID = DECODE(Y.E_POBJ_ID(+),NULL,POBJ.ID,Y.E_POBJ_ID(+)) AND
POBJ.ID = DECODE(Y.EN_POBJ_ID(+),NULL,POBJ.ID,Y.EN_POBJ_ID(+))
Problem is with the two full outer joins wht i am using
there only i find the query taking too much time
Thanks
Sudhir
Message was edited by:
Sudhir_N
Message was edited by:
Sudhir_N

Answer 1

You'll have to get an exection plan and manually tune the query.
That aside, inline views can really slow queries down because once the data is stored in a temporary table you can't do fast indexed lookups on their result sets. They also make queries be more complicated. Also, outer joins tend to slow queries down a lot in general.