Query very very slow

Question

Hi Guys,
I have one simple query but data volume is too huge and it's taking too long time. Can you guys suggest how to improve it's response time or lets say we can re-write in different manner to achieve performance gain.
SELECT b.BENE_CLM_NUM_EQ, b.HSE_CLM_THRU_DT
  FROM haji.haji_clm_b b
where b.hse_clm_thru_dt BETWEEN to_date('01/01/2007', 'mm/dd/yyyy') AND
       to_date('12/31/2007', 'mm/dd/yyyy')
   AND b.hcfa_clm_proc_dt <= to_date('03/31/2008', 'mm/dd/yyyy')
   AND b.final_action_sw = 'Y'
   and exists
(select l.link_num
          from haji.haji_clm_b_line l
         WHERE l.run_dt = b.run_dt
           AND l.link_num = b.link_num
           AND (l.HCPCS_CD IN (SELECT c.code
                                 from dmatta.CKD1_codes c
                                WHERE l.HCPCS_CD = c.code
                                  AND c.type = 'EXHCPCS') OR
               l.DGNS_CD IN (SELECT c.code
                                from dmatta.CKD1_codes c
                               WHERE l.DGNS_CD = c.code
                                 AND c.type = 'EXICD9DX')));
PLAN_TABLE_OUTPUT                                                                                                                                                                                                                                                                                           
Plan hash value: 1387564539                                                                                                                                                                                                                                                                                 
| Id  | Operation                 | Name            | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |                                                                                                                                                                                       
|   0 | SELECT STATEMENT          |                 |     1 |    67 |       |    27M  (2)|108:01:15 |       |       |                                                                                                                                                                                       
|*  1 |  HASH JOIN RIGHT SEMI     |                 |     1 |    67 |    21G|    27M  (2)|108:01:15 |       |       |                                                                                                                                                                                       
|   2 |   VIEW                    | VW_SQ_1         |   675M|    13G|       |    22M  (2)| 86:23:02 |       |       |                                                                                                                                                                                       
|*  3 |    FILTER                 |                 |       |       |       |            |          |       |       |                                                                                                                                                                                       
|   4 |     PARTITION RANGE ALL   |                 |  6925M|   167G|       |    22M  (2)| 86:23:02 |     1 |    25 |                                                                                                                                                                                       
|   5 |      TABLE ACCESS FULL    | HAJI_CLM_B_LINE |  6925M|   167G|       |    22M  (2)| 86:23:02 |     1 |    25 |                                                                                                                                                                                       
|*  6 |     TABLE ACCESS FULL     | CKD1_CODES      |     1 |    12 |       |     2   (0)| 00:00:01 |       |       |                                                                                                                                                                                       
|*  7 |      TABLE ACCESS FULL    | CKD1_CODES      |     1 |    12 |       |     2   (0)| 00:00:01 |       |       |                                                                                                                                                                                       
|   8 |   PARTITION RANGE ITERATOR|                 |   679M|    28G|       |  3021K  (3)| 11:44:58 |    21 |    24 |                                                                                                                                                                                       
|*  9 |    TABLE ACCESS FULL      | HAJI_CLM_B      |   679M|    28G|       |  3021K  (3)| 11:44:58 |    21 |    24 |                                                                                                                                                                                       
Query Block Name / Object Alias (identified by operation id):                                                                                                                                                                                                                                               
   1 - SEL$C772B8D1                                                                                                                                                                                                                                                                                         
   2 - SEL$683B0107 / VW_SQ_1@SEL$7511BFD2                                                                                                                                                                                                                                                                  
   3 - SEL$683B0107                                                                                                                                                                                                                                                                                         
   5 - SEL$683B0107 / L@SEL$2                                                                                                                                                                                                                                                                               
   6 - SEL$3        / C@SEL$3                                                                                                                                                                                                                                                                               
   7 - SEL$4        / C@SEL$4                                                                                                                                                                                                                                                                               
   9 - SEL$C772B8D1 / B@SEL$1                                                                                                                                                                                                                                                                               
Predicate Information (identified by operation id):                                                                                                                                                                                                                                                         
   1 - access("RUN_DT"="B"."RUN_DT" AND "LINK_NUM"="B"."LINK_NUM")                                                                                                                                                                                                                                          
   3 - filter( EXISTS (SELECT 0 FROM "DMATTA"."CKD1_CODES" "C" WHERE "C"."CODE"=:B1 AND                                                                                                                                                                                                                     
              "C"."TYPE"='EXHCPCS') OR  EXISTS (SELECT 0 FROM "DMATTA"."CKD1_CODES" "C" WHERE "C"."CODE"=:B2 AND                                                                                                                                                                                            
              "C"."TYPE"='EXICD9DX'))                                                                                                                                                                                                                                                                       
   6 - filter("C"."CODE"=:B1 AND "C"."TYPE"='EXHCPCS')                                                                                                                                                                                                                                                      
   7 - filter("C"."CODE"=:B1 AND "C"."TYPE"='EXICD9DX')                                                                                                                                                                                                                                                     
   9 - filter("B"."FINAL_ACTION_SW"='Y' AND "B"."HSE_CLM_THRU_DT"<=TO_DATE('2007-12-31 00:00:00',                                                                                                                                                                                                           
              'yyyy-mm-dd hh24:mi:ss') AND "B"."HCFA_CLM_PROC_DT"<=TO_DATE('2008-03-31 00:00:00', 'yyyy-mm-dd hh24:mi:ss'))                                                                                                                                                                                 
Column Projection Information (identified by operation id):                                                                                                                                                                                                                                                 
   1 - (#keys=2) "B"."BENE_CLM_NUM_EQ"[VARCHAR2,12], "B"."HSE_CLM_THRU_DT"[DATE,7]                                                                                                                                                                                                                          
   2 - "RUN_DT"[DATE,7], "LINK_NUM"[NUMBER,22]                                                                                                                                                                                                                                                              
   3 - "L"."RUN_DT"[DATE,7], "L"."LINK_NUM"[NUMBER,22]                                                                                                                                                                                                                                                      
   4 - "L"."RUN_DT"[DATE,7], "L"."LINK_NUM"[NUMBER,22], "L"."DGNS_CD"[VARCHAR2,5], "L"."HCPCS_CD"[VARCHAR2,5]                                                                                                                                                                                               
   5 - "L"."RUN_DT"[DATE,7], "L"."LINK_NUM"[NUMBER,22], "L"."DGNS_CD"[VARCHAR2,5], "L"."HCPCS_CD"[VARCHAR2,5]                                                                                                                                                                                               
   6 - "C"."CODE"[VARCHAR2,6], "C"."TYPE"[VARCHAR2,10]                                                                                                                                                                                                                                                      
   7 - "C"."CODE"[VARCHAR2,6], "C"."TYPE"[VARCHAR2,10]                                                                                                                                                                                                                                                      
   8 - "B"."RUN_DT"[DATE,7], "B"."LINK_NUM"[NUMBER,22], "B"."HSE_CLM_THRU_DT"[DATE,7],                                                                                                                                                                                                                      
       "B"."BENE_CLM_NUM_EQ"[VARCHAR2,12]                                                                                                                                                                                                                                                                   
   9 - "B"."RUN_DT"[DATE,7], "B"."LINK_NUM"[NUMBER,22], "B"."HSE_CLM_THRU_DT"[DATE,7],                                                                                                                                                                                                                      
       "B"."BENE_CLM_NUM_EQ"[VARCHAR2,12]                                                                                                                                                                                                                                                                   
Note                                                                                                                                                                                                                                                                                                        
   - dynamic sampling used for this statement                                                                                                                                                                                                                                                               
58 rows selected

Answer 1

Hi Taral,
I think you need some indexes my friend. You have a lot of multi-gigabyte FULL TABLE SCANS - and luckily - your query has some range and equality predicates. I would suggest experimenting with these:
/* Indexes for table: haji_clm_b */
CREATE INDEX haji.haji_clm_b_idx1 ON haji.haji_clm_b (hse_clm_thru_dt);
CREATE INDEX haji.haji_clm_b_idx2 ON haji.haji_clm_b (hcfa_clm_proc_dt);
CREATE INDEX haji.haji_clm_b_idx3 ON haji.haji_clm_b (run_dt, link_num);
-- Create bitmap here if it has lower cardinality (which it seems it does) AND if the table is infrequently updated...
CREATE BITMAP INDEX haji.haji_clm_b_idx4 ON haji.haji_clm_b (final_action_sw);
/* Indexes for table: haji_clm_b_line */
CREATE INDEX haji.haji_clm_b_line_idx1 ON haji.haji_clm_b_line (hcpcs_cd);
CREATE INDEX haji.haji_clm_b_line_idx2 ON haji.haji_clm_b_line (dgns_cd);
/* Indexes for table: ckd1_codes */
CREATE INDEX dmatta.ckd1_codes_idx1 ON dmatta.ckd1_codes (TYPE);I would also suggest slightly re-writing your query like this:
SELECT bene_clm_num_eq
     , hse_clm_thru_dt
  FROM haji.haji_clm_b
WHERE hse_clm_thru_dt BETWEEN TO_DATE ('01/01/2007'
                                      , 'mm/dd/yyyy') AND TO_DATE ('12/31/2007'
                                                                 , 'mm/dd/yyyy')
   AND hcfa_clm_proc_dt <= TO_DATE ('03/31/2008'
                                  , 'mm/dd/yyyy')
   AND final_action_sw = 'Y'
   AND (run_dt, link_num) IN (SELECT run_dt
                                   , link_num
                                FROM haji.haji_clm_b_line
                               WHERE (   hcpcs_cd IN (SELECT code
                                                        FROM dmatta.ckd1_codes
                                                       WHERE TYPE = 'EXHCPCS')
                                      OR dgns_cd IN (SELECT code
                                                       FROM dmatta.ckd1_codes
                                                      WHERE TYPE = 'EXICD9DX')));Give it a try and let us know how it goes....
Good luck.
Message was edited by:
PDaddy