Response time issue querying a view

Question

Hi All,
The following query is taking more than 20-25 mins to run and it does not return any result. Ideally it should return 0 rows but still it takes 20-25 mins to achieve that.
Select * from WV_WMS_STOCK_MOVEMENT; --> it’s a View
Database: Oracle 8i
O/S : Solaris 8
Below is the explain plan for above stmt
SQL> @?/rdbms/admin/utlxpls
| Operation                 |  Name    |  Rows | Bytes|  Cost  | Pstart| Pstop |                                                 
| SELECT STATEMENT          |          |   364 |  774K|1042445 |       |       |                                                 
|  VIEW                     |WV_WMS_ST |   364 |  774K|1042445 |       |       |                                                 
|   SORT UNIQUE             |          |   364 |   30K|1042445 |       |       |                                                 
|    UNION-ALL              |          |       |      |        |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      NESTED LOOPS         |          |     1 |  116 | 173829 |       |       |                                                 
|       HASH JOIN           |          |     1 |  102 | 173828 |       |       |                                                 
|        NESTED LOOPS       |          |    12K|  822K| 172929 |       |       |                                                 
|         TABLE ACCESS FULL |MSK       |   145K|    7M| 172929 |       |       |                                                 
|         INDEX UNIQUE SCAN |TBL_IDX1  |    15 |  210 |        |       |       |                                                 
|        TABLE ACCESS FULL  |OST       |    85K|    2M|    445 |       |       |                                                 
|       INDEX UNIQUE SCAN   |PRO_IDX1  |   261K|    3M|      1 |       |       |                                                 
|      TABLE ACCESS BY INDEX|TBL       |     1 |   25 |      7 |       |       |                                                 
|       INDEX RANGE SCAN    |TBL_IDX1  |     1 |      |      2 |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      HASH JOIN            |          |   240 |   19K| 174015 |       |       |                                                 
|       NESTED LOOPS        |          |    12K|  822K| 172929 |       |       |                                                 
|        TABLE ACCESS FULL  |MSK       |   145K|    7M| 172929 |       |       |                                                 
|        INDEX UNIQUE SCAN  |TBL_IDX1  |    15 |  210 |        |       |       |                                                 
|       INDEX FAST FULL SCAN|PRO_IDX1  |   261K|    3M|    293 |       |       |                                                 
|      TABLE ACCESS BY INDEX|TBL       |     1 |   25 |      7 |       |       |                                                 
|       INDEX RANGE SCAN    |TBL_IDX1  |     1 |      |      2 |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      HASH JOIN            |          |   120 |   10K| 174017 |       |       |                                                 
|       NESTED LOOPS        |          |    12K|  858K| 172929 |       |       |                                                 
|        TABLE ACCESS FULL  |MSK       |   145K|    8M| 172929 |       |       |                                                 
|        INDEX UNIQUE SCAN  |TBL_IDX1  |    15 |  210 |        |       |       |                                                 
|       INDEX FAST FULL SCAN|PRO_IDX1  |   261K|    3M|    293 |       |       |                                                 
|      TABLE ACCESS BY INDEX|TBL       |     1 |   25 |      7 |       |       |                                                 
|       INDEX RANGE SCAN    |TBL_IDX1  |     1 |      |      2 |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      NESTED LOOPS         |          |     1 |  165 | 173485 |       |       |                                                 
|       NESTED LOOPS        |          |     1 |  151 | 173484 |       |       |                                                 
|        HASH JOIN          |          |     1 |  101 | 173478 |       |       |                                                 
|         TABLE ACCESS FULL |MSK       |   803 |   54K| 172929 |       |       |                                                 
|         TABLE ACCESS FULL |OST       |    85K|    2M|    445 |       |       |                                                 
|        TABLE ACCESS BY IND|MSK       |    32K|    1M|      6 |       |       |                                                 
|         INDEX RANGE SCAN  |MSK_IDX1  |    32K|      |      5 |       |       |                                                 
|       INDEX UNIQUE SCAN   |PRO_IDX1  |   261K|    3M|      1 |       |       |                                                 
|      TABLE ACCESS BY INDEX|TBL       |     1 |   25 |      7 |       |       |                                                 
|       INDEX RANGE SCAN    |TBL_IDX1  |     1 |      |      2 |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      NESTED LOOPS         |          |     1 |  133 | 173560 |       |       |                                                 
|       HASH JOIN           |          |    16 |    1K| 173464 |       |       |                                                 
|        TABLE ACCESS FULL  |MSK       |   803 |   54K| 172929 |       |       |                                                 
|        INDEX FAST FULL SCA|PRO_IDX1  |   261K|    3M|    293 |       |       |                                                 
|       TABLE ACCESS BY INDE|MSK       |    32K|    1M|      6 |       |       |                                                 
|        INDEX RANGE SCAN   |MSK_IDX1  |    32K|      |      5 |       |       |                                                 
|      TABLE ACCESS BY INDEX|TBL       |     1 |   25 |      7 |       |       |                                                 
|       INDEX RANGE SCAN    |TBL_IDX1  |     1 |      |      2 |       |       |                                                 
|     FILTER                |          |       |      |        |       |       |                                                 
|      NESTED LOOPS         |          |     1 |  133 | 173512 |       |       |                                                 
|       HASH JOIN           |          |     8 |  664 | 173464 |       |       |                                                 
|        TABLE ACCESS FULL  |MSK       |   803 |   54K| 172929 |       |       |                                                 
|        INDEX FAST FULL SCA|PRO_IDX1  |   261K|    3M|    293 |       |       |                                                 
|       TABLE ACCESS BY INDE|MSK       |    32K|    1M|      6 |       |       |                                                 
|        INDEX RANGE SCAN   |MSK_IDX1  |    32K|      |      5 |       |       |                                                 
|      TABLE ACCESS FULL    |TBL       |     1 |   25 |     49 |       |       |                                                 
--------------------------------------------------------------------------------                                                  Code of view is :
CREATE OR REPLACE VIEW "SOC1"."WV_WMS_STOCK_MOVEMENT" ("CODSOC",
    "CODOSK","WAREHOUSE_SITE","SIGDEP_FROM","SIGDEP_TO","CODPRO",
    "QTEOPE","DATMVT","HEUMVT","REFLOT","DATLC","LIBMSK","NUMMSK",
    "INDTRT","NUMLOT","ID","PUMP") AS
    SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep, msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), ost.reflot, 
  ost.datlc,  msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk, '1.23' 
from tbl t954, pro, ost, msk 
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  ost.codsoc = msk.codsoc 
and  ost.codpro = msk.codpro 
and  ost.numlot = msk.numlot 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) in ('L', 'X') 
and  msk.sigdep NOT IN (select a.lib1 
                          from tbl a 
                         where a.codsoc = msk.codsoc 
                           and a.codtbl = '961' 
                           and a.lir = 'DEP') 
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- Single MVT 
SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep, msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), ' ', 
  ' ', msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk , '1.23' 
from tbl t954, pro, msk 
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) in ('S', 'E') 
and  msk.sigdep NOT IN (select a.lib1 
                          from tbl a 
                         where a.codsoc = msk.codsoc 
                           and a.codtbl = '961' 
                           and a.lir = 'DEP') 
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- Single MVT 
SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep,   msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), msk.numdeb, 
  ' ', msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk, '1.23' 
from tbl t954, pro, msk 
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) = 'U' 
and  msk.sigdep NOT IN (select a.lib1 
                          from tbl a 
                         where a.codsoc = msk.codsoc 
                           and a.codtbl = '961' 
                           and a.lir = 'DEP') 
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- transfer 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt, WF_WMS_HEURE(a.heumvt), ost.reflot, 
  ost.datlc,DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
  RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk , '1.23' 
from ost, pro, msk a, msk b 
where 
    a.codsoc=0 
and a.codosk = 'WHOR' 
and a.indtrt = ' ' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  ost.codsoc = a.codsoc 
and  ost.codpro = a.codpro 
and  ost.numlot = a.numlot 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) in ('L', 'X') 
and  a.sigdep NOT IN (select t.lib1 
                          from tbl t 
       where t.codsoc = a.codsoc 
         and t.codtbl = '961' 
        and t.lir = 'DEP') 
UNION 
-- Transfer 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt, WF_WMS_HEURE(a.heumvt), ' ', 
  ' ', DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
    RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk , '1.23' 
from pro, msk a, msk b 
where 
    a.codsoc=0 
and a.indtrt = ' ' 
and a.codosk = 'WHOR' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) in ('S', 'E') 
and  a.sigdep NOT IN (select t.lib1 
                          from tbl t 
       where t.codsoc = a.codsoc 
         and t.codtbl = '961' 
         and t.lir = 'DEP') 
UNION 
-- TRFINI 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt,WF_WMS_HEURE(a.heumvt), a.numdeb, 
  ' ', DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
  RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk, '1.23' 
from pro, msk a, msk b 
where 
    a.codsoc=0 
and a.indtrt = ' ' 
and a.codosk = 'WHOR' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) = 'U' 
and  a.sigdep NOT IN (select a.lib1 
                          from tbl a 
       where a.codsoc = a.codsoc 
         and a.codtbl = '961' 
         and a.lir = 'DEP')Please help...
Thanks

Answer 1

I see three problems, one of which was pointed out by Ignacio Ruiz.
#1 IN (SELECT ...) and NOT IN (SELECT ...) tends to be slow in Oracle 8i due to the requirement that the subquery be processed multiple times. It is often more efficient to convert this syntax into an outer join, and specify that the join column is either NOT NULL or NULL, depending on if you are trying to replace IN (SELECT ...) or, NOT IN (SELECT ...) syntax.
#2 It appears that there area couple PL/SQL calls, which can cause a context switch, and hinder performance: WF_WMS_HEURE(msk.heumvt), WF_WMS_SUISTK(msk.sigdep, pro.codpro), WF_WMS_HEURE(a.heumvt), etc.
#3 UNION syntax is used rather than UNION ALL - if possible, use UNION ALL instead.
An example of fixing problem #1, adjusting just the portion of the query before the "UNION":
CREATE OR REPLACE VIEW "SOC1"."WV_WMS_STOCK_MOVEMENT" ("CODSOC",
    "CODOSK","WAREHOUSE_SITE","SIGDEP_FROM","SIGDEP_TO","CODPRO",
    "QTEOPE","DATMVT","HEUMVT","REFLOT","DATLC","LIBMSK","NUMMSK",
    "INDTRT","NUMLOT","ID","PUMP") AS
SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep, msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), ost.reflot, 
  ost.datlc,  msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk, '1.23' 
from tbl t954, pro, ost, msk,
  (select distinct
     a.codsoc,
     a.lib1 
   from
     tbl a 
   where
     a.codtbl = '961' 
     and a.lir = 'DEP') a
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  ost.codsoc = msk.codsoc 
and  ost.codpro = msk.codpro 
and  ost.numlot = msk.numlot 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) in ('L', 'X') 
and  msk.codsoc=a.codsoc(+)
and  msk.sigdep=a.lib1(+) 
and  a.codsoc is null
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- Single MVT 
SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep, msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), ' ', 
  ' ', msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk , '1.23' 
from tbl t954, pro, msk 
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) in ('S', 'E') 
and  msk.sigdep NOT IN (select a.lib1 
                          from tbl a 
                         where a.codsoc = msk.codsoc 
                           and a.codtbl = '961' 
                           and a.lir = 'DEP') 
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- Single MVT 
SELECT 
  msk.codsoc, msk.codosk, DECODE(SUBSTR(msk.sigdep,1,3), 'GER', 'GAR', SUBSTR(msk.sigdep,1,3)), 
  msk.sigdep,   msk.sigdep, 
  msk.codpro, msk.qteope, msk.datmvt, WF_WMS_HEURE(msk.heumvt), msk.numdeb, 
  ' ', msk.libmsk, msk.nummsk, msk.indtrt, msk.numlot, 
  RPAD(msk.sigdep,12,' ')||RPAD(msk.codpro,12,' ')||RPAD(msk.numlot,12,' ')||msk.nummsk, '1.23' 
from tbl t954, pro, msk 
where 
     msk.codsoc = 0 
and  msk.indtrt = ' ' 
and  pro.codsoc = msk.codsoc 
and  pro.codpro = msk.codpro 
and  WF_WMS_SUISTK(msk.sigdep, pro.codpro) = 'U' 
and  msk.sigdep NOT IN (select a.lib1 
                          from tbl a 
                         where a.codsoc = msk.codsoc 
                           and a.codtbl = '961' 
                           and a.lir = 'DEP') 
and t954.codsoc = msk.codsoc 
and t954.codtbl = '954' 
and t954.cletbl = msk.codosk 
UNION 
-- transfer 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt, WF_WMS_HEURE(a.heumvt), ost.reflot, 
  ost.datlc,DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
  RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk , '1.23' 
from ost, pro, msk a, msk b 
where 
    a.codsoc=0 
and a.codosk = 'WHOR' 
and a.indtrt = ' ' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  ost.codsoc = a.codsoc 
and  ost.codpro = a.codpro 
and  ost.numlot = a.numlot 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) in ('L', 'X') 
and  a.sigdep NOT IN (select t.lib1 
                          from tbl t 
       where t.codsoc = a.codsoc 
         and t.codtbl = '961' 
        and t.lir = 'DEP') 
UNION 
-- Transfer 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt, WF_WMS_HEURE(a.heumvt), ' ', 
  ' ', DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
    RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk , '1.23' 
from pro, msk a, msk b 
where 
    a.codsoc=0 
and a.indtrt = ' ' 
and a.codosk = 'WHOR' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) in ('S', 'E') 
and  a.sigdep NOT IN (select t.lib1 
                          from tbl t 
       where t.codsoc = a.codsoc 
         and t.codtbl = '961' 
         and t.lir = 'DEP') 
UNION 
-- TRFINI 
SELECT 
  a.codsoc, a.codosk, DECODE(SUBSTR(a.sigdep,1,3), 'GER', 'GAR', SUBSTR(a.sigdep,1,3)), 
  a.sigdep, b.sigdep, 
  a.codpro, a.qteope, a.datmvt,WF_WMS_HEURE(a.heumvt), a.numdeb, 
  ' ', DECODE(a.typeve, 'RET', a.typeve||a.numeve, a.libmsk), a.nummsk, a.indtrt, a.numlot, 
  RPAD(a.sigdep,12,' ')||RPAD(a.codpro,12,' ')||RPAD(a.numlot,12,' ')||a.nummsk, '1.23' 
from pro, msk a, msk b 
where 
    a.codsoc=0 
and a.indtrt = ' ' 
and a.codosk = 'WHOR' 
and b.codsoc = a.codsoc 
and b.codpro = a.codpro 
and b.numlot = a.numlot 
and b.numdeb = a.numdeb 
and b.datmvt = a.datmvt 
and b.heumvt = a.heumvt 
and b.qteope = a.qteope 
and b.codosk = 'WHIR' 
and  pro.codsoc = a.codsoc 
and  pro.codpro = a.codpro 
and  WF_WMS_SUISTK(a.sigdep, pro.codpro) = 'U' 
and  a.sigdep NOT IN (select a.lib1 
                          from tbl a 
       where a.codsoc = a.codsoc 
         and a.codtbl = '961' 
         and a.lir = 'DEP')Try changing the remaining NOT IN subqueries to outer joins, and compare the performance.
Charles Hooper
IT Manager/Oracle DBA
K&M Machine-Fabricating, Inc.