Explain Plan in Oracle

Explain Plan in Oracle


--====================================================
HOW to Generate EXPLAIN PLAN and
how to read and understand
--====================================================


explain plan into sys.plan_table$ for 
select * from ap_suppliers A

select * from table(dbms_xplan.display('sys.plan_table$'));

--====================================================

explain plan into sys.plan_table$ for 
select * from ap_supplier_sites_all

select * from table(dbms_xplan.display('sys.plan_table$'));

--====================================================

explain plan into sys.plan_table$ for 
select * from ap_suppliers A, ap_supplier_sites_all B
where A.VENDOR_ID = B.VENDOR_ID

select * from table(dbms_xplan.display('sys.plan_table$'));


--====================================================

explain plan into sys.plan_table$ for 
select * from ap_suppliers A, ap_supplier_sites_all B
where A.VENDOR_ID = B.VENDOR_ID and
org_id = 82

select * from table(dbms_xplan.display('sys.plan_table$'));

--====================================================

explain plan into sys.plan_table$ for 

select * from ap_suppliers A, ap_supplier_sites_all B
where A.VENDOR_ID = B.VENDOR_ID
and org_id = 82
and A.vendor_id = 1

select * from table(dbms_xplan.display('sys.plan_table$'));


--==================================================================
OUTPUT
--==================================================================
Plan hash value: 3410715412
 select * from ap_suppliers A
------------------------------------------------------------------------------------------
| Id  | Operation                 | Name         | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT          |              |   372K|    98M|  4037   (2)| 00:00:01 |
|   1 |  TABLE ACCESS STORAGE FULL| AP_SUPPLIERS |   372K|    98M|  4037   (2)| 00:00:01 |
------------------------------------------------------------------------------------------

Plan hash value: 3644361572
 select * from ap_supplier_sites_all
---------------------------------------------------------------------------------------------------
| Id  | Operation                 | Name                  | Rows  | Bytes | Cost (%CPU)| Time     |
---------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT          |                       |   371K|   132M|  5046   (1)| 00:00:01 |
|   1 |  TABLE ACCESS STORAGE FULL| AP_SUPPLIER_SITES_ALL |   371K|   132M|  5046   (1)| 00:00:01 |
---------------------------------------------------------------------------------------------------

Plan hash value: 1704517579
 select * from ap_suppliers A, ap_supplier_sites_all B where A.VENDOR_ID = B.VENDOR_ID
------------------------------------------------------------------------------------------------------------
| Id  | Operation                  | Name                  | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT           |                       |   371K|   231M|       | 20991   (1)| 00:00:01 |
|*  1 |  HASH JOIN                 |                       |   371K|   231M|   102M| 20991   (1)| 00:00:01 |
|   2 |   TABLE ACCESS STORAGE FULL| AP_SUPPLIERS          |   372K|    98M|       |  4037   (2)| 00:00:01 |
|   3 |   TABLE ACCESS STORAGE FULL| AP_SUPPLIER_SITES_ALL |   371K|   132M|       |  5046   (1)| 00:00:01 |
------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - access("A"."VENDOR_ID"="B"."VENDOR_ID")
 
Plan hash value: 3540612086
 select * from ap_suppliers A, ap_supplier_sites_all B where A.VENDOR_ID = B.VENDOR_ID and  B.org_id = 82
-------------------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name                  | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                       | 61967 |    38M|       | 15310   (1)| 00:00:01 |
|*  1 |  HASH JOIN                  |                       | 61967 |    38M|    22M| 15310   (1)| 00:00:01 |
|   2 |   JOIN FILTER CREATE        | :BF0000               | 61967 |    22M|       |  5033   (1)| 00:00:01 |
|*  3 |    TABLE ACCESS STORAGE FULL| AP_SUPPLIER_SITES_ALL | 61967 |    22M|       |  5033   (1)| 00:00:01 |
|   4 |   JOIN FILTER USE           | :BF0000               |   372K|    98M|       |  4037   (2)| 00:00:01 |
|*  5 |    TABLE ACCESS STORAGE FULL| AP_SUPPLIERS          |   372K|    98M|       |  4037   (2)| 00:00:01 |
-------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - access("A"."VENDOR_ID"="B"."VENDOR_ID")
   3 - storage("ORG_ID"=82)
       filter("ORG_ID"=82)
   5 - storage(SYS_OP_BLOOM_FILTER(:BF0000,"A"."VENDOR_ID"))
       filter(SYS_OP_BLOOM_FILTER(:BF0000,"A"."VENDOR_ID")) 

 
Plan hash value: 569357530
 select * from ap_suppliers A, ap_supplier_sites_all B where A.VENDOR_ID = B.VENDOR_ID  and org_id = 82 and A.vendor_id = 1
--------------------------------------------------------------------------------------------------------------
| Id  | Operation                            | Name                  | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                     |                       |     1 |   653 |     6   (0)| 00:00:01 |
|   1 |  NESTED LOOPS                        |                       |     1 |   653 |     6   (0)| 00:00:01 |
|   2 |   TABLE ACCESS BY INDEX ROWID        | AP_SUPPLIERS          |     1 |   278 |     3   (0)| 00:00:01 |
|*  3 |    INDEX UNIQUE SCAN                 | AP_SUPPLIERS_U1       |     1 |       |     2   (0)| 00:00:01 |
|   4 |   TABLE ACCESS BY INDEX ROWID BATCHED| AP_SUPPLIER_SITES_ALL |     1 |   375 |     3   (0)| 00:00:01 |
|*  5 |    INDEX RANGE SCAN                  | AP_SUPPLIER_SITES_U2  |     1 |       |     2   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   3 - access("A"."VENDOR_ID"=1)
   5 - access("B"."VENDOR_ID"=1 AND "ORG_ID"=82)
       filter("ORG_ID"=82)

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