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bind vars change explain plan

From: Baker, Barbara <bbaker_at_denvernewspaperagency.com>
Date: Fri, 19 Jul 2002 10:23:27 -0800
Message-ID: <F001.0049CD99.20020719102327@fatcity.com> 




Env:	OpenVMS 7.2-1
	Oracle 7.3.4.4
	VB code feeding data to a Crystal report





This query runs in less than a second without the bind variables.  Same
query takes about 10 minutes with the bind variables.
Originally I accused VB, but when I fake the bind variables in sql*plus and
run just this query directly on the server, the same thing happens.  I just
told a developer to run without bind variables!  Yuk!



The explain plan changes when using binds.  The non-bind-var code uses an
index on wo (i_alt_wo_act_date); the bind-var code does not use this index.
Is there something about using bind variables that will invalidate using an
index?  I tried forcing an index hint, but it does not work.



Sorry if I'm missing something obvious.


Thanks for any help!



Barb


SLOW (using bind's)



SELECT /*+ INDEX(WO I_ALT_WO_ACT_DATE) */

job_nbr, sig_code, text, ROWID


FROM orr ox


WHERE job_nbr IN (SELECT job_nbr FROM wo
WHERE act_date_time

  BETWEEN TO_DATE(:v_bdat,'MM/DD/YYYY HH12:MI:SS AM')
      AND TO_DATE(:v_edat,'MM/DD/YYYY HH12:MI:SS AM')
      AND (wo.pub IN ('ROP','ISRT','TMC','COMC','TVWK','PRNT')
       OR (wo.pub = 'WEB' AND wo.edition NOT LIKE 'C%')))


AND ox.orr_date_time <= TO_DATE(:v_odat,'MM/DD/YYYY HH12:MI:SS AM')
ORDER BY job_nbr, ROWID



call     count       cpu    elapsed       disk      query    current
rows


------- ------  -------- ---------- ---------- ---------- ----------




Parse        1      0.00       0.02          0          0          0
0


Execute      1      0.00       0.00          0          0          0
0


Fetch        1     44.13     534.16      90292     284168          2
0


------- ------  -------- ---------- ---------- ---------- ----------




total        3     44.13     534.18      90292     284168          2
0



Misses in library cache during parse: 0


Optimizer goal: CHOOSE


Parsing user id: 21  (ADMARC)



Rows     Execution Plan

-------  ---------------------------------------------------
      0  SELECT STATEMENT   GOAL: CHOOSE
      0   SORT (ORDER BY)
      7    HASH JOIN
      1     VIEW
      1      SORT (UNIQUE)
      0       CONCATENATION
      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

     31        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
     32         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'WO_ISSUE_DATE_PUB_IDX' (NON-UNIQUE)

      6        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      7         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'WO_ISSUE_DATE_PUB_IDX' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      1         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'WO_ISSUE_DATE_PUB_IDX' (NON-UNIQUE)

   8280        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
   8281         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'WO_ISSUE_DATE_PUB_IDX' (NON-UNIQUE)

 188242        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
 188243         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'WO_ISSUE_DATE_PUB_IDX' (NON-UNIQUE)

 129553     TABLE ACCESS   GOAL: ANALYZED (FULL) OF 'ORR'






FAST (without binds)



SELECT job_nbr, sig_code, text, ROWID


FROM orr


WHERE job_nbr IN (SELECT job_nbr FROM wo
WHERE act_date_time


  BETWEEN TO_DATE('07/17/2002 3:00:00 PM','MM/DD/YYYY HH12:MI:SS AM')


      AND TO_DATE('07/17/2002 4:00:00 PM','MM/DD/YYYY HH12:MI:SS AM')
      AND (wo.pub IN ('ROP','ISRT','TMC','COMC','TVWK','PRNT')
       OR (wo.pub = 'WEB'
          AND wo.edition NOT LIKE 'C%')))


AND orr.orr_date_time <=


  TO_DATE('07/17/2002 4:00:00 PM','MM/DD/YYYY HH12:MI:SS AM')

ORDER BY job_nbr, ROWID



call     count       cpu    elapsed       disk      query    current
rows


------- ------  -------- ---------- ---------- ---------- ----------




Parse        1      0.01       0.00          0          0          0
0


Execute      1      0.00       0.00          0          0          0
0


Fetch        1      0.72       4.40       9507       4546          2
0


------- ------  -------- ---------- ---------- ---------- ----------




total        3      0.73       4.40       9507       4546          2
0



Misses in library cache during parse: 0


Optimizer goal: CHOOSE


Parsing user id: 21  (ADMARC)



Rows     Execution Plan

-------  ---------------------------------------------------
      0  SELECT STATEMENT   GOAL: CHOOSE
      0   SORT (ORDER BY)
      7    HASH JOIN
      1     VIEW
      1      SORT (UNIQUE)
      0       CONCATENATION
      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      0        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

      1        TABLE ACCESS   GOAL: ANALYZED (BY ROWID) OF 'WO'
      2         INDEX   GOAL: ANALYZED (RANGE SCAN) OF


                    'I_ALT_WO_ACT_DATE' (NON-UNIQUE)

 129553     TABLE ACCESS   GOAL: ANALYZED (FULL) OF 'ORR'




-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Baker, Barbara
  INET: bbaker_at_denvernewspaperagency.com

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Received on Fri Jul 19 2002 - 13:23:27 CDT












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