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From: Jack van Zanen <nlzanen1_at_EY.NL>
Date: Wed, 28 Aug 2002 05:58:51 -0800
Message-ID: <F001.004C153B.20020828055851@fatcity.com> 





Oracle 8.0.5


AIX 4.3.3



I Have following statement, which takes forever and does lots of physical
reads





insert into test_table


   SELECT   v1.engagement, v1.YEAR, v1.period, MAX (v2.net_fee_earned_ptd)
,

            MAX (v2.exp_wip_val_ptd)
       FROM (SELECT   MAX (wstat.eng_numb) engagement,
                      MAX (wstat.fnancl_year) YEAR, MAX (wstat.prd_numb)
period,
                        SUM (NVL (wstat.time_wip_val_ptd, 0))
                      + SUM (NVL (wstat.gnrl_w_on_ptd, 0))


                      - SUM (NVL (wstat.gnrl_w_off_ptd, 0))

                      - SUM (NVL (wstat.time_wip_val_w_off_ptd, 0))

                      - SUM (NVL (wstat.wip_prvsn_ptd, 0))

                      - SUM (NVL (wstat.exp_wip_val_w_off_ptd, 0))

                      - SUM (NVL (dstat.dbtrs_w_off_ptd, 0))

                      - SUM (NVL (dstat.dbtrs_prvsn_ptd, 0))

                            net_fee_earned_ptd,
                      SUM (NVL (wstat.exp_wip_val_ptd, 0)) exp_wip_val_ptd
                 FROM eng_wip_stats wstat, eng_dbtrs_stats dstat
                WHERE wstat.eng_numb(+) = dstat.eng_numb
                  AND wstat.fnancl_year = dstat.fnancl_year
                  AND wstat.prd_numb = dstat.prd_numb
                  AND wstat.eng_numb = '1000001'
             GROUP BY wstat.eng_numb, wstat.fnancl_year, wstat.prd_numb)
v1,
            (SELECT   MAX (wstat.eng_numb) engagement,
                      MAX (wstat.fnancl_year) YEAR, MAX (wstat.prd_numb)
period,
                        SUM (NVL (wstat.time_wip_val_ptd, 0))
                      + SUM (NVL (wstat.gnrl_w_on_ptd, 0))


                      - SUM (NVL (wstat.gnrl_w_off_ptd, 0))

                      - SUM (NVL (wstat.time_wip_val_w_off_ptd, 0))

                      - SUM (NVL (wstat.wip_prvsn_ptd, 0))

                      - SUM (NVL (wstat.exp_wip_val_w_off_ptd, 0))

                      - SUM (NVL (dstat.dbtrs_w_off_ptd, 0))

                      - SUM (NVL (dstat.dbtrs_prvsn_ptd, 0))

                            net_fee_earned_ptd,
                      SUM (NVL (wstat.exp_wip_val_ptd, 0)) exp_wip_val_ptd
                 FROM eng_wip_stats wstat, eng_dbtrs_stats dstat
                WHERE wstat.eng_numb(+) = dstat.eng_numb
                  AND wstat.fnancl_year = dstat.fnancl_year
                  AND wstat.prd_numb = dstat.prd_numb
                  AND wstat.eng_numb = '1000001'
             GROUP BY wstat.eng_numb, wstat.fnancl_year, wstat.prd_numb) v2
      WHERE v1.engagement = v2.engagement(+)
        AND TO_DATE (   v2.YEAR(+)
                     || v2.period(+), 'YYYYMM') >=
                   ADD_MONTHS (TO_DATE (   v1.YEAR
                                        || v1.period, 'YYYYMM'), -12)
        AND TO_DATE (   v2.YEAR(+)
                     || v2.period(+), 'YYYYMM') <=
                                    TO_DATE (   v1.YEAR
                                             || v1.period, 'YYYYMM')


   GROUP BY v1.engagement, v1.YEAR, v1.period
/





Here is the explain plan:





   ID   PID QUERY_PLAN



----- -----



    0       INSERT STATEMENT   Cost = 106
    1     0   SORT GROUP BY  Card=1
    2     1     NESTED LOOPS OUTER  Card=1
    3     2       VIEW   Card=1
    4     3         SORT GROUP BY  Card=1
    5     4           HASH JOIN   Card=1
    6     5             TABLE ACCESS BY INDEX ROWID ENG_DBTRS_STATS Card=19
    7     6               INDEX RANGE SCAN IDX_EG10_ENGNUMB_CRNTFLAG
Card=19
    8     5             TABLE ACCESS BY INDEX ROWID ENG_WIP_STATS Card=21
    9     8               INDEX RANGE SCAN IDX_EG09_ENGNUMB_CRNTFLAG
Card=21
   10     2       VIEW   Card=1
   11    10         SORT GROUP BY  Card=1
   12    11           HASH JOIN   Card=1
   13    12             TABLE ACCESS BY INDEX ROWID ENG_DBTRS_STATS Card=19
   14    13               INDEX RANGE SCAN IDX_EG10_ENGNUMB_CRNTFLAG
Card=19
   15    12             TABLE ACCESS BY INDEX ROWID ENG_WIP_STATS Card=21
   16    15               INDEX RANGE SCAN IDX_EG09_ENGNUMB_CRNTFLAG


Card=21



17 rows selected.





If I just run the select part (not insert into) it's really quick



With the following explain plan:




   ID   PID QUERY_PLAN



----- -----



    0       SELECT STATEMENT   Cost = 106
    1     0   SORT GROUP BY  Card=1
    2     1     NESTED LOOPS OUTER  Card=1
    3     2       VIEW   Card=1
    4     3         SORT GROUP BY  Card=1
    5     4           HASH JOIN   Card=1
    6     5             TABLE ACCESS BY INDEX ROWID ENG_DBTRS_STATS Card=19
    7     6               INDEX RANGE SCAN IDX_EG10_ENGNUMB_CRNTFLAG
Card=19
    8     5             TABLE ACCESS BY INDEX ROWID ENG_WIP_STATS Card=21
    9     8               INDEX RANGE SCAN IDX_EG09_ENGNUMB_CRNTFLAG
Card=21
   10     2       VIEW   Card=1
   11    10         SORT GROUP BY  Card=1
   12    11           HASH JOIN   Card=1
   13    12             TABLE ACCESS BY INDEX ROWID ENG_DBTRS_STATS Card=19
   14    13               INDEX RANGE SCAN IDX_EG10_ENGNUMB_CRNTFLAG
Card=19
   15    12             TABLE ACCESS BY INDEX ROWID ENG_WIP_STATS Card=21
   16    15               INDEX RANGE SCAN IDX_EG09_ENGNUMB_CRNTFLAG


Card=21



17 rows selected.





Apart from the word INSERT being replaced by SELECT I don't see why it
would take so long. (no difference)




I turned tracing on and looked at the trace files for both statements and
the difference seems to be only in "WAIT #1: nam='db file sequential read'
ela= 0 p1=37 p2=127244 p3=1" which the insert into has many many many in th
etrace file and the normal select only has few.( different numbers)




Anybody seen this before?? Know a solution??




Oh ja: If I do "create table as"  it works really quick also



TIA



Jack





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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jack van Zanen
  INET: nlzanen1_at_EY.NL

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Received on Wed Aug 28 2002 - 08:58:51 CDT












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