Re: bind vars change explain plan

Barbara,

Did you try to run "slow" version without index hint, or moving this hint into sub-query?

Igor Neyman, OCP DBA
ineyman_at_perceptron.com

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Friday, July 19, 2002 2:23 PM

> 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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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Igor Neyman
  INET: ineyman_at_perceptron.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
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also send the HELP command for other information (like subscribing).