Query is slow

Question

SELECT SUM(A.NO_MONTH_CONSUMPTION),SUM(A.BASE_CONSUMPTION),SUM(A.CURRENT_DOC_AMT),SUM(A.CUR_TAX),SUM(B.CURRENT_DOC_AMT)
FROM VW_x A,(SELECT CURRENT_DOC_AMT,DOC_NO
FROM VW_y B
WHERE NVL(B.VOID_STATUS,0)=0 AND B.TR_TYPE_CODE='SW' AND B.BPREF_NO=:B4 AND B.SERVICE_CODE=:B3 AND B.BIZ_PART_CODE=:B2 AND B.CONS_CODE=:B1 ) B
WHERE A.BPREF_NO=:B4 AND A.SERVICE_CODE=:B3 AND A.BIZ_PART_CODE=:B2 AND A.CONS_CODE=:B1 AND A.BILL_MONTH >:B5 AND NVL(A.VOID_STATUS,0)=0 AND NVL(A.AVG_IND,0)= 2 AND A.DOC_NO=B.DOC_NO(+)
the above view "VW_x" has around 40 million records from two tables and avg_ind column has only 0 and 2 values. I created a functional index on both table something like create index on x1 nvl(avg,0)
TRACE OUT PUT
STATISTICS
15  recursive calls
0  db block gets
  18  consistent gets
4  physical reads
0  redo size
357 bytes sent via SQL*Net to client
252 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
1 rows processed
but still the query is slow...please suggest the best practise to make it fast
thanks

Answer 1

Hi sorry i was out of office for a while please check the execution plan for my query.
Below query i am calling in a procedure passing the parameters
  While i execute the query separatly it works fine but the same thing when i call in procedure and the procedure has loop which goes and check around 400,000 records thats where i get the problem
select sum(a.no_month_consumption),sum(a.base_consumption),sum(a.current_doc_amt),sum(a.cur_tax),sum(b.current_doc_amt
--into vnomonths,vcons,vconsamt,vtaxamt,vsewage
from bill_View a,(select current_doc_amt,doc_no from dbcr_View b where nvl(b.void_status,0)=0 and b.tr_type_code='SWGDBG' and b.bpref_no='Q12345' and b.service_code='E' and b.biz_part_code='MHEW') b
where a.bpref_no='Q12345' and a.service_code='E' and a.biz_part_code='MHEW'
and a.bill_month >'30-aPR-2011' and nvl(a.void_status,0)=0 and decode(a.avg_ind,null,0,a.avg_ind)= 2
and a.doc_no=b.doc_no(+);
I created functionaly inde on avg_ind column (nvl(avg_ind,0))
Execution Plan
   0      SELECT STATEMENT Optimizer=ALL_ROWS (Cost=77 Card=1 Bytes=93
   1    0   SORT (AGGREGATE)
   2    1     HASH JOIN (OUTER) (Cost=77 Card=4 Bytes=372)
   3    2       VIEW OF 'VW_IBS_BILL' (VIEW) (Cost=54 Card=3 Bytes=198
   4    3         UNION-ALL
   5    4           TABLE ACCESS (BY INDEX ROWID) OF 'IBS_S_T_BILL' (T
          ABLE) (Cost=8 Card=1 Bytes=50)
   6    5             INDEX (RANGE SCAN) OF 'STBILL_BPREF_NO' (INDEX)
          (Cost=3 Card=5)
   7    4           TABLE ACCESS (BY INDEX ROWID) OF 'IBS_X_T_BILL' (T
          ABLE) (Cost=46 Card=2 Bytes=114)
   8    7             INDEX (RANGE SCAN) OF 'XTBILL' (INDEX) (Cost=3 C
          ard=43)
   9    2       VIEW OF 'VW_IBS_DBCR' (VIEW) (Cost=22 Card=4 Bytes=108
  10    9         UNION-ALL
  11   10           TABLE ACCESS (BY INDEX ROWID) OF 'IBS_T_DBCR' (TAB
          LE) (Cost=2 Card=1 Bytes=54)
  12   11             INDEX (RANGE SCAN) OF 'TDBCR_BPREFNO' (INDEX) (C
          ost=1 Card=1)
  13   10           TABLE ACCESS (BY INDEX ROWID) OF 'IBS_S_T_DBCR' (T
          ABLE) (Cost=7 Card=1 Bytes=43)
  14   13             INDEX (RANGE SCAN) OF 'STDBCR_BPREFNO' (INDEX) (
          Cost=3 Card=4)
  15   10           TABLE ACCESS (BY INDEX ROWID) OF 'IBS_X_T_DBCR' (T
          ABLE) (Cost=13 Card=2 Bytes=88)
  16   15             INDEX (RANGE SCAN) OF 'XTDBCR' (INDEX) (Cost=3 C
          ard=11)
what is Card and Cost attributes in the above output..................... ?