Reg : Cost -

Question

Hi Experts,
I'm trying to tune this query but nothing seems to reduce the cost.
Any pointers is highly appreciated.
PERSON_DETAIL – +2,275,776 rows+
D_OPN – +1,57,094+
D_GPN – +49,197+
Query fetches –- +2,704,577 rows+
explain plan for
SELECT 
               to_char(casd.transaction_date,'yyyy-mm-dd')||'T'||to_char(casd.transaction_date,'hh24:mi:ss')||'.000' "Interaction Date",
               'en_US' "Locale",
               pd.email "Email",
               casd.myti_permid "User Id",
               pd.first_name "First Name",
               gpn.generic_part_number "Product",
               gpn.generic_part_number_id "Product ID",   
               'aaa'||gpn.generic_part_number "Product Image URL",
               NULL "Price"
          FROM customer_activity_samp_detail casd,
               person_detail pd,
               d_gpn gpn
        WHERE casd.stakeholder_num = pd.stakeholder_num
               AND EXISTS ( SELECT 1
                         FROM d_opn opn
                        WHERE opn.gpn_id = gpn.generic_part_number_id
                              AND opn.orderable_part_number(+) = casd.product);Explain Plan -
Plan hash value: 2059255244
| Id  | Operation                | Name                          | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT         |                               |   157K|    15M|       |   103K  (1)| 00:24:08 |
|*  1 |  HASH JOIN               |                               |   157K|    15M|       |   103K  (1)| 00:24:08 |
|   2 |   MAT_VIEW ACCESS FULL   | D_GPN                         | 49197 |   768K|       |   214   (1)| 00:00:04 |
|*  3 |   HASH JOIN              |                               |   157K|    13M|     9M|   103K  (1)| 00:24:05 |
|*  4 |    HASH JOIN             |                               |   157K|  8284K|  4768K| 72234   (1)| 00:16:52 |
|   5 |     SORT UNIQUE          |                               |   157K|  2914K|       |   357   (1)| 00:00:06 |
|   6 |      MAT_VIEW ACCESS FULL| D_OPN                         |   157K|  2914K|       |   357   (1)| 00:00:06 |
|   7 |     TABLE ACCESS FULL    | CUSTOMER_ACTIVITY_SAMP_DETAIL |  2704K|    90M|       | 65569   (1)| 00:15:18 |
|   8 |    TABLE ACCESS FULL     | PERSON_DETAIL                 |  2272K|    75M|       | 25340   (1)| 00:05:55 |
Predicate Information (identified by operation id):
   1 - access("OPN"."GPN_ID"="GPN"."GENERIC_PART_NUMBER_ID")
   3 - access("CASD"."STAKEHOLDER_NUM"="PD"."STAKEHOLDER_NUM")
   4 - access("OPN"."ORDERABLE_PART_NUMBER"="CASD"."PRODUCT")Database version -
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi
PL/SQL Release 10.2.0.3.0 - Production
CORE     10.2.0.3.0     Production
TNS for Solaris: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production

Answer 1

Jeneesh,
Why the EXISTS is giving better result than the ANSI OUTER JOIN ???
Both gives result with RowCount = 2,702,110 rows
1] Query Using EXISTS -
explain plan for
SELECT
               to_char(casd.transaction_date,'yyyy-mm-dd')||'T'||to_char(casd.transaction_date,'hh24:mi:ss')||'.000' "Interaction Date",
               'en_US' "Locale",
               pd.email "Email",
               casd.myti_permid "User Id",
               pd.first_name "First Name",
               gpn.generic_part_number "Product",
               gpn.generic_part_number_id "Product ID",   
               'aaa'||gpn.generic_part_number "Product Image URL",
               NULL "Price"
          FROM ezmad.customer_activity_samp_detail casd,
               ezmad.person_detail pd,
               ezmad.d_gpn gpn
              -- ezmad.d_opn opn
        WHERE casd.stakeholder_num = pd.stakeholder_num
               -- AND opn.gpn_id = gpn.generic_part_number_id
                --AND opn.orderable_part_number(+) = casd.product;
               AND EXISTS ( SELECT 1
                         FROM ezmad.d_opn opn
                        WHERE opn.gpn_id = gpn.generic_part_number_id
                              AND opn.orderable_part_number(+) = casd.product);
Plan hash value: 2059255244
| Id  | Operation                | Name                          | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT         |                               |   157K|    15M|       |   103K  (1)| 00:24:08 |
|*  1 |  HASH JOIN               |                               |   157K|    15M|       |   103K  (1)| 00:24:08 |
|   2 |   MAT_VIEW ACCESS FULL   | D_GPN                         | 49197 |   768K|       |   214   (1)| 00:00:04 |
|*  3 |   HASH JOIN              |                               |   157K|    13M|     9M|   103K  (1)| 00:24:05 |
|*  4 |    HASH JOIN             |                               |   157K|  8284K|  4768K| 72234   (1)| 00:16:52 |
|   5 |     SORT UNIQUE          |                               |   157K|  2914K|       |   357   (1)| 00:00:06 |
|   6 |      MAT_VIEW ACCESS FULL| D_OPN                         |   157K|  2914K|       |   357   (1)| 00:00:06 |
|   7 |     TABLE ACCESS FULL    | CUSTOMER_ACTIVITY_SAMP_DETAIL |  2704K|    90M|       | 65569   (1)| 00:15:18 |
|   8 |    TABLE ACCESS FULL     | PERSON_DETAIL                 |  2269K|    75M|       | 25340   (1)| 00:05:55 |
Predicate Information (identified by operation id):
   1 - access("OPN"."GPN_ID"="GPN"."GENERIC_PART_NUMBER_ID")
   3 - access("CASD"."STAKEHOLDER_NUM"="PD"."STAKEHOLDER_NUM")
   4 - access("OPN"."ORDERABLE_PART_NUMBER"="CASD"."PRODUCT")2] Query using ANSI OUTER JOIN -
explain plan for
SELECT 
               to_char(casd.transaction_date,'yyyy-mm-dd')||'T'||to_char(casd.transaction_date,'hh24:mi:ss')||'.000' "Interaction Date",
               'en_US' "Locale",
               pd.email "Email",
               casd.myti_permid "User Id",
               pd.first_name "First Name",
               gpn.generic_part_number "Product",
               gpn.generic_part_number_id "Product ID",   
               'aaa'||gpn.generic_part_number "Product Image URL",
               NULL "Price"
          FROM ezmad.customer_activity_samp_detail casd
          join  ezmad.person_detail pd on (casd.stakeholder_num = pd.stakeholder_num)
          left outer join ezmad.d_opn opn on (opn.orderable_part_number = casd.product)
          join ezmad.d_gpn gpn on (opn.gpn_id = gpn.generic_part_number_id);
Plan hash value: 735325213
| Id  | Operation               | Name                          | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT        |                               |  2720K|   272M|       |   111K  (1)| 00:26:01 |
|*  1 |  HASH JOIN              |                               |  2720K|   272M|       |   111K  (1)| 00:26:01 |
|   2 |   MAT_VIEW ACCESS FULL  | D_GPN                         | 49197 |   768K|       |   214   (1)| 00:00:04 |
|*  3 |   HASH JOIN             |                               |  2720K|   230M|   101M|   111K  (1)| 00:25:58 |
|   4 |    TABLE ACCESS FULL    | PERSON_DETAIL                 |  2269K|    75M|       | 25340   (1)| 00:05:55 |
|*  5 |    HASH JOIN            |                               |  2720K|   140M|  4768K| 72234   (1)| 00:16:52 |
|   6 |     MAT_VIEW ACCESS FULL| D_OPN                         |   157K|  2914K|       |   357   (1)| 00:00:06 |
|   7 |     TABLE ACCESS FULL   | CUSTOMER_ACTIVITY_SAMP_DETAIL |  2704K|    90M|       | 65569   (1)| 00:15:18 |
Predicate Information (identified by operation id):
   1 - access("OPN"."GPN_ID"="GPN"."GENERIC_PART_NUMBER_ID")
   3 - access("CASD"."STAKEHOLDER_NUM"="PD"."STAKEHOLDER_NUM")
   5 - access("OPN"."ORDERABLE_PART_NUMBER"="CASD"."PRODUCT")Any pointer guys???
Edited by: ranit B on Dec 19, 2012 5:35 PM
Edited by: ranit B on Dec 19, 2012 5:36 PM