Poor query performance when I have select ...xmlsequence in from clause

Question

Here is my query and it takes forever to execute. When I run the xmlsequence query alone, it takes a few seconds. But once added to from clause and I execute the query below together, it takes too long. Is there a better way to do the same?
What I am doing here is what is there in t1 should not be there in what is returned from the subquery (xmlsequence).
select distinct t1.l_type l_type,
TO_CHAR(t1.dt1,'DD-MON-YY') dt1 ,
TO_CHAR(t2.dt2,'DD-MON-YY') dt2, t1.l_nm
from table1 t1,table2 t2,
select k.column_value.extract('/RHS/value/text()').getStringVal() as lki
from d_v dv
, table(xmlsequence(dv.xmltypecol.extract('//c/RHS')))k
) qds
where
t2.l_id = t1.l_id
and to_char(t1.l_id) not in qds.lki

Answer 1

SQL> SELECT *
  2  FROM   TABLE(DBMS_XPLAN.DISPLAY);
Plan hash value: 2820226721
| Id  | Operation                            | Name                   | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                     |                        |  7611M|   907G|       |   352M  (1)|999:59:59 |
|   1 |  HASH UNIQUE                         |                        |  7611M|   907G|  2155G|   352M  (1)|999:59:59 |
|*  2 |   HASH JOIN                          |                        |  9343M|  1113G|       |    22M  (2)| 76:31:45 |
|   3 |    TABLE ACCESS FULL                 | table2           |  1088 | 17408 |       |     7   (0)| 00:00:0
|   4 |    NESTED LOOPS                      |                        |  8468M|   883G|       |    22M  (1)| 76:15:57 |
|   5 |     MERGE JOIN CARTESIAN             |                        |  1037K|   108M|       |  4040   (1)| 00:00:49 |
|   6 |      TABLE ACCESS FULL               | D_V        |  1127 | 87906 |       |    56   (0)| 00
|   7 |      BUFFER SORT                     |                        |   921 | 29472 |       |  3984   (1)| 00:00:48 |
|   8 |       TABLE ACCESS FULL              | table1                   |   921 | 29472 |       |     4   (0)| 00:00:01 |
|*  9 |     COLLECTION ITERATOR PICKLER FETCH| XMLSEQUENCEFROMXMLTYPE |       |       |       |           
Predicate Information (identified by operation id):
   2 - access("t2"."L_ID"="t1"."L_ID")
   9 - filter(TO_CHAR("t1"."L_ID")<>"XMLTYPE"."GETSTRINGVAL"("XMLTYPE"."EXTRACT"(VALUE(KOKB
              alue/text()')))Message was edited by:
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