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09.23.2008 at 02:42PM PDT, ID: 23756728
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URGENT  -  ORACLE query with sort is slow, contains functions

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8.0
Zones:

Oracle 10.x, PL / SQL, JScript

Tags:

ORACLE, 10g
I am interested to find ways to improve query response time when working with database calculations, especially when sorting must be used.

I have functions I wrote in PL/SQL for returning some calculations ...LOW val, HIGH val, and a SUM val (LOW + HIGH)

i have a separate function for each.  my database is composed of a number of projects for my company and in each project, we need to calculate a LOW, HIGH, and SUM value for each ...the rows in the TABLE_C table are used across projects so the query is a little more complex.   so....I first found all C.ID that are used on the project  (project id = '1081' in this example query)   then ...for those C.ID, I am trying to return the calculated LOW, HIGH, SUM functions.  this query is taking about 12 seconds to complete.  if I remove the ORDER BY at the end of the query......it returns the result in ~5seconds.....which is manageable.....    So, is there a different way for me to structure this query so I can avoid these long query times.  I can move the sorting to javascript, but don't know anything about how to do that.  am I doing something wrong in my structure....and is there a way for me to calculate the sum of LOW and HIGH ....without recalculating low and hi?   that would cut my query time in half alone.  i just feel like my query is very slow because I am sorting on a calculated field.  please help!!


SELECT C.ID,
P.FIELD_P1,
C.FIELD_C1
C.FIELD_C2,
FXN.CCSL(C.ID) AS LOW,
FXN.CCSU(C.ID) AS HI,
(FXN.CCSL(C.ID) + FXN.CCSU(C.ID)) AS SUM_VALS
FROM TABLE_C C, TABLE_P P
WHERE C.P_ID = P.ID  AND (C.ID IN
    (SELECT
            DISTINCT SCC.ID
            FROM TABLE_S S, TABLE_SCC SCC
            WHERE S.ID = SCC.S_ID AND (S.PROJECT_ID = '1081')))
ORDER BY SUM_VALS DESC
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Answered By: sdstuber
Expert Since: 10/06/2003
Accepted Solutions: 1846
Computer Expertise: Advanced
sdstuber has been an Expert for 5 years 3 months, during which he has posted 7484 comments and answered 1846 questions. sdstuber is just one of 761 experts in the Oracle 10.x Zone. 3 experts collaborated on this answer, which was graded an "A" by the asker.
 
 
20081119-EE-VQP-47 / EE_QW_2_20070628