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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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