The EXPLAIN PLAN results let you determine whether the optimizer selects a particular execution plan, such as, nested loops join. It also helps you to understand the optimizer decisions, such as why the optimizer chose a nested loops join instead of a hash join, and lets you understand the performance of a query.

The EXPLAIN PLAN statement displays execution plans chosen by the Oracle optimizer for SELECT, UPDATE, INSERT, and DELETE statements. A statement's execution plan is the sequence of operations Oracle performs to run the statement

An execution plan includes an access path for each table that the statement accesses and an ordering of the tables (the join order) with the appropriate join method.

To execute a SQL statement, Oracle might need to perform many steps. Each of these steps either retrieves rows of data physically from the database or prepares them in some way for the user issuing the statement. The combination of the steps Oracle uses to execute a statement is called an execution plan.

Example illustrates the way the execution plan explained

EXPLAIN PLAN FORSELECT e.employee_id, j.job_title, e.salary, d.department_name FROM employees e, jobs j, departments d WHERE e.employee_id < 103 AND e.job_id = j.job_id AND e.department_id = d.department_id;

Here the plan will be explainedThen execute the following to know the Predicate Information

select * from table(dbms_xplan.display(NULL, NULL, 'TYPICAL'));

EXPLAIN PLAN Output-----------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)|-----------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 3 | 189 | 10 (10)|| 1 | NESTED LOOPS | | 3 | 189 | 10 (10)|| 2 | NESTED LOOPS | | 3 | 141 | 7 (15)||* 3 | TABLE ACCESS FULL | EMPLOYEES | 3 | 60 | 4 (25)|| 4 | TABLE ACCESS BY INDEX ROWID| JOBS | 19 | 513 | 2 (50)||* 5 | INDEX UNIQUE SCAN | JOB_ID_PK | 1 | | || 6 | TABLE ACCESS BY INDEX ROWID | DEPARTMENTS | 27 | 432 | 2 (50)||* 7 | INDEX UNIQUE SCAN | DEPT_ID_PK | 1 | | |-----------------------------------------------------------------------------Predicate Information (identified by operation id):--------------------------------------------------- 3 - filter("E"."EMPLOYEE_ID"<103) 5 - access("E"."JOB_ID"="J"."JOB_ID") 7 - access("E"."DEPARTMENT_ID"="D"."DEPARTMENT_ID“)

The DBMS_XPLAN package provides an easy way to display the output of the EXPLAIN PLAN command in several, predefined formats.

The DBMS_XPLAN package supplies below table functions:

◦ DISPLAY : To format and display the contents of a plan table ◦ DISPLAY_CURSOR : To format and display the contents of the

execution plan of any loaded cursor.

DISPLAY Function: This table function displays the contents of the plan

table.

SyntaxDBMS_XPLAN.DISPLAY

( table_name IN VARCHAR2 DEFAULT

'PLAN_TABLE',statement_id IN VARCHAR2 DEFAULT NULL, format IN VARCHAR2 DEFAULT 'TYPICAL‘);

Let us consider a piece of query and see the optimizer behavior with either ways of EXPLAIN PLAN and EXECUTION PLAN

Example (a) – Using Explain Plan

SELECT TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID

Example (b) – Displaying a Plan Table Using

(a) DBMS_XPLAN.DISPLAY

Step 1: Execute an explain plan command on a SELECT statement:

EXPLAIN PLAN FOR select……………………[query used above] Step 2: Display the plan using the

DBMS_XPLAN.DISPLAY table function select * from table(dbms_xplan.display(NULL, NULL,

'TYPICAL'))

This query produces the following output:

PLAN_TABLE_OUTPUT

Plan hash value: 3336623817 -------------------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 17 | 1156 | 4 (0)| 00:00:01 | | 1 | NESTED LOOPS | | 17 | 1156 | 4 (0)| 00:00:01 | |* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | 1 | 42 | 1 (0)| 00:00:01 | |* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | 1 | | 0 (0)| 00:00:01 | | 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | 17 | 442 | 3 (0)| 00:00:01 | |* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | 17 | | 1 (0)| 00:00:01 | --------------------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - filter(NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND

NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!)) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001)

DISPLAY_CURSOR Function This table function displays the explain plan of any

cursor loaded in the cursor cache.

Syntax DBMS_XPLAN.DISPLAY_CURSOR ( sql_id IN VARCHAR2 DEFAULT NULL, child_number IN NUMBER DEFAULT NULL, format IN VARCHAR2 DEFAULT 'TYPICAL‘ );

Example (a) – Using Display_Cursor

SELECT /* abc */ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL

(PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID

Step 1:Execute the querySELECT /* abc */ --------------[query used above]

Step 2: Get sql_id and child_number for the preceding statement:

SELECT sql_id, child_number, sql_text, sql_fulltextFROM v$sql where sql_text like '%abc%' Step 3:

SELECT * FROM TABLE (DBMS_XPLAN.DISPLAY_CURSOR (‘NULL', NULL, 'advanced allstats last')) ;

PLAN_TABLE_OUTPUT

SQL_ID 1hcqg71hwa8cc, child number 0-------------------------------------SELECT /* abc*/ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID Plan hash value: 3336623817 -------------------------------------------------------------------------------------------------| Id | Operation | Name | E-Rows |E-Bytes| Cost (%CPU)| E-Time |-------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | | | 4 (100)| || 1 | NESTED LOOPS | | 17 | 1156 | 4 (0)| 00:00:01 ||* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | 1 | 42 | 1 (0)| 00:00:01 ||* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | 1 | | 0 (0)| || 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | 17 | 442 | 3 (0)| 00:00:01 ||* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | 17 | | 1 (0)| 00:00:01 |------------------------------------------------------------------------------------------------- Query Block Name / Object Alias (identified by operation id):------------------------------------------------------------- 1 - SEL$1 2 - SEL$1 / PROJ@SEL$1 3 - SEL$1 / PROJ@SEL$1 4 - SEL$1 / TASK@SEL$1 5 - SEL$1 / TASK@SEL$1

Outline Data------------- /*+ BEGIN_OUTLINE_DATA IGNORE_OPTIM_EMBEDDED_HINTS OPTIMIZER_FEATURES_ENABLE('10.2.0.5') OPT_PARAM('_b_tree_bitmap_plans' 'false') OPT_PARAM('_fast_full_scan_enabled' 'false') OPT_PARAM('_index_join_enabled' 'false') ALL_ROWS OUTLINE_LEAF(@"SEL$1") INDEX_RS_ASC(@"SEL$1" "PROJ"@"SEL$1" ("PA_PROJECTS_ALL"."PROJECT_ID")) INDEX_RS_ASC(@"SEL$1" "TASK"@"SEL$1" ("PA_TASKS"."PROJECT_ID" "PA_TASKS"."PM_TASK_REFERENCE")) LEADING(@"SEL$1" "PROJ"@"SEL$1" "TASK"@"SEL$1") USE_NL(@"SEL$1" "TASK"@"SEL$1") END_OUTLINE_DATA */ Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001) Column Projection Information (identified by operation id):----------------------------------------------------------- 1 - "PROJ"."NAME"[VARCHAR2,30], "PROJ"."SEGMENT1"[VARCHAR2,25], "TASK"."TASK_NUMBER"[VARCHAR2,25], "TASK"."TASK_NAME"[VARCHAR2,20] 2 - "PROJ"."NAME"[VARCHAR2,30], "PROJ"."SEGMENT1"[VARCHAR2,25] 3 - "PROJ".ROWID[ROWID,10] 4 - "TASK"."TASK_NUMBER"[VARCHAR2,25], "TASK"."TASK_NAME"[VARCHAR2,20] 5 - "TASK".ROWID[ROWID,10] Note----- - Warning: basic plan statistics not available. These are only collected when: * hint 'gather_plan_statistics' is used for the statement or * parameter 'statistics_level' is set to 'ALL', at session or system level

Example (b) – Using Hint /*+ GATHER_PLAN_STATISTICS */

PLAN_TABLE_OUTPUT

SQL_ID 4azc9hf0kzg5g, child number 0-------------------------------------SELECT /* abc*/ /*+ GATHER_PLAN_STATISTICS */ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID Plan hash value: 3336623817 -------------------------------------------------------------------------------------------------| Id | Operation | Name | Starts | A-Rows | A-Time | Buffers |-------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 7 |00:00:00.01 | 6 || 1 | NESTED LOOPS | | 1 | 7 |00:00:00.01 | 6 ||* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | 1 | 1 |00:00:00.01 | 3 ||* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | 1 | 1 |00:00:00.01 | 2 || 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | 1 | 7 |00:00:00.01 | 3 ||* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | 1 | 7 |00:00:00.01 | 2 |-------------------------------------------------------------------------------------------------

Query Block Name / Object Alias (identified by operation id):------------------------------------------------------------- 1 - SEL$1 2 - SEL$1 / PROJ@SEL$1 3 - SEL$1 / PROJ@SEL$1 4 - SEL$1 / TASK@SEL$1 5 - SEL$1 / TASK@SEL$1 Outline Data------------- /*+ BEGIN_OUTLINE_DATA IGNORE_OPTIM_EMBEDDED_HINTS OPTIMIZER_FEATURES_ENABLE('10.2.0.5') OPT_PARAM('_b_tree_bitmap_plans' 'false') OPT_PARAM('_fast_full_scan_enabled' 'false') OPT_PARAM('_index_join_enabled' 'false') ALL_ROWS OUTLINE_LEAF(@"SEL$1") INDEX_RS_ASC(@"SEL$1" "PROJ"@"SEL$1" ("PA_PROJECTS_ALL"."PROJECT_ID")) INDEX_RS_ASC(@"SEL$1" "TASK"@"SEL$1" ("PA_TASKS"."PROJECT_ID" "PA_TASKS"."PM_TASK_REFERENCE")) LEADING(@"SEL$1" "PROJ"@"SEL$1" "TASK"@"SEL$1") USE_NL(@"SEL$1" "TASK"@"SEL$1") END_OUTLINE_DATA */ Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001)

Example (c)

SELECT * FROM TABLE (DBMS_XPLAN.DISPLAY_CURSOR ('d5k3znj9dfaw3', NULL, 'allstats last -rows +predicate')) ;

PLAN_TABLE_OUTPUT

SQL_ID byc2atjb80w2z, child number 0

-------------------------------------

SELECT /* bambo*/ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1,

PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1

AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL

(PROJ.TEMPLATE_START_DATE_ACTIVE,

TO_DATE ('01-01-1900', 'MM-DD-YYYY')

) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE,

TRUNC (SYSDATE)

) AND TASK.PROJECT_ID = PROJ.PROJECT_ID

Plan hash value: 3336623817

--------------------------------------------------------

| Id | Operation | Name |

--------------------------------------------------------

| 0 | SELECT STATEMENT | |

| 1 | NESTED LOOPS | |

|* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL |

|* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 |

| 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS |

|* 5 | INDEX RANGE SCAN | PA_TASKS_N8 |

--------------------------------------------------------

Cont…

Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND

NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!

))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001) Note----- - Warning: basic plan statistics not available. These are only collected when: * hint 'gather_plan_statistics' is used for the statement or * parameter 'statistics_level' is set to 'ALL', at session or system level

Example (c) – Using Hint /*+ GATHER_PLAN_STATISTICS */

PLAN_TABLE_OUTPUT

SQL_ID 7quur9z2hcc8b, child number 0-------------------------------------SELECT /* bambo*/ /*+ GATHER_PLAN_STATISTICS */ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID Plan hash value: 3336623817 -------------------------------------------------------------------------------------------------| Id | Operation | Name | Starts | A-Rows | A-Time | Buffers |-------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 7 |00:00:00.01 | 6 || 1 | NESTED LOOPS | | 1 | 7 |00:00:00.01 | 6 ||* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | 1 | 1 |00:00:00.01 | 3 ||* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | 1 | 1 |00:00:00.01 | 2 || 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | 1 | 7 |00:00:00.01 | 3 ||* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | 1 | 7 |00:00:00.01 | 2 |------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001)

Example (d)

SELECT * FROM TABLE (DBMS_XPLAN.DISPLAY_CURSOR ('d5k3znj9dfaw3', NULL, 'allstats last -rows +alias +outline +predicate')) ;

PLAN_TABLE_OUTPUT

SQL_ID 1fd86xmu1swwt, child number 0 ------------------------------------- SELECT /* saboo */ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID Plan hash value: 3336623817 -------------------------------------------------------- | Id | Operation | Name | -------------------------------------------------------- | 0 | SELECT STATEMENT | | | 1 | NESTED LOOPS | | |* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | |* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | | 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | |* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | -------------------------------------------------------- Query Block Name / Object Alias (identified by operation id): ------------------------------------------------------------- 1 - SEL$1 2 - SEL$1 / PROJ@SEL$1 3 - SEL$1 / PROJ@SEL$1 4 - SEL$1 / TASK@SEL$1 5 - SEL$1 / TASK@SEL$1

Cont….

Outline Data

------------- /*+ BEGIN_OUTLINE_DATA IGNORE_OPTIM_EMBEDDED_HINTS OPTIMIZER_FEATURES_ENABLE('10.2.0.5') OPT_PARAM('_b_tree_bitmap_plans' 'false') OPT_PARAM('_fast_full_scan_enabled' 'false') OPT_PARAM('_index_join_enabled' 'false') ALL_ROWS OUTLINE_LEAF(@"SEL$1") INDEX_RS_ASC(@"SEL$1" "PROJ"@"SEL$1" ("PA_PROJECTS_ALL"."PROJECT_ID")) INDEX_RS_ASC(@"SEL$1" "TASK"@"SEL$1" ("PA_TASKS"."PROJECT_ID" "PA_TASKS"."PM_TASK_REFERENCE")) LEADING(@"SEL$1" "PROJ"@"SEL$1" "TASK"@"SEL$1") USE_NL(@"SEL$1" "TASK"@"SEL$1") END_OUTLINE_DATA */ Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@! ))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001) Note----- - Warning: basic plan statistics not available. These are only collected when: * hint 'gather_plan_statistics' is used for the statement or * parameter 'statistics_level' is set to 'ALL', at session or system level

Example (d) – Using Hint /*+ GATHER_PLAN_STATISTICS */

PLAN_TABLE_OUTPUT

SQL_ID 35d4cm4a53kd2, child number 0-------------------------------------SELECT /* saboo */ /*+ GATHER_PLAN_STATISTICS */ TASK.TASK_NAME, TASK.TASK_NUMBER, PROJ.SEGMENT1, PROJ.NAME FROM PA.PA_PROJECTS_ALL PROJ, PA.PA_TASKS TASK WHERE 1 = 1 AND PROJ.PROJECT_ID = 1001 AND TRUNC (SYSDATE) BETWEEN NVL (PROJ.TEMPLATE_START_DATE_ACTIVE, TO_DATE ('01-01-1900', 'MM-DD-YYYY') ) AND NVL (PROJ.TEMPLATE_END_DATE_ACTIVE, TRUNC (SYSDATE) ) AND TASK.PROJECT_ID = PROJ.PROJECT_ID Plan hash value: 3336623817 -------------------------------------------------------------------------------------------------| Id | Operation | Name | Starts | A-Rows | A-Time | Buffers |-------------------------------------------------------------------------------------------------| 0 | SELECT STATEMENT | | 1 | 7 |00:00:00.01 | 6 || 1 | NESTED LOOPS | | 1 | 7 |00:00:00.01 | 6 ||* 2 | TABLE ACCESS BY INDEX ROWID| PA_PROJECTS_ALL | 1 | 1 |00:00:00.01 | 3 ||* 3 | INDEX UNIQUE SCAN | PA_PROJECTS_U1 | 1 | 1 |00:00:00.01 | 2 || 4 | TABLE ACCESS BY INDEX ROWID| PA_TASKS | 1 | 7 |00:00:00.01 | 3 ||* 5 | INDEX RANGE SCAN | PA_TASKS_N8 | 1 | 7 |00:00:00.01 | 2 |------------------------------------------------------------------------------------------------- Query Block Name / Object Alias (identified by operation id):------------------------------------------------------------- 1 - SEL$1 2 - SEL$1 / PROJ@SEL$1 3 - SEL$1 / PROJ@SEL$1 4 - SEL$1 / TASK@SEL$1 5 - SEL$1 / TASK@SEL$1

Cont…

Outline Data------------- /*+ BEGIN_OUTLINE_DATA IGNORE_OPTIM_EMBEDDED_HINTS OPTIMIZER_FEATURES_ENABLE('10.2.0.5') OPT_PARAM('_b_tree_bitmap_plans' 'false') OPT_PARAM('_fast_full_scan_enabled' 'false') OPT_PARAM('_index_join_enabled' 'false') ALL_ROWS OUTLINE_LEAF(@"SEL$1") INDEX_RS_ASC(@"SEL$1" "PROJ"@"SEL$1" ("PA_PROJECTS_ALL"."PROJECT_ID")) INDEX_RS_ASC(@"SEL$1" "TASK"@"SEL$1" ("PA_TASKS"."PROJECT_ID" "PA_TASKS"."PM_TASK_REFERENCE")) LEADING(@"SEL$1" "PROJ"@"SEL$1" "TASK"@"SEL$1") USE_NL(@"SEL$1" "TASK"@"SEL$1") END_OUTLINE_DATA */ Predicate Information (identified by operation id):--------------------------------------------------- 2 - filter((NVL("PROJ"."TEMPLATE_START_DATE_ACTIVE",TO_DATE(' 1900-01-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))<=TRUNC(SYSDATE@!) AND NVL("PROJ"."TEMPLATE_END_DATE_ACTIVE",TRUNC(SYSDATE@!))>=TRUNC(SYSDATE@!))) 3 - access("PROJ"."PROJECT_ID"=1001) 5 - access("TASK"."PROJECT_ID"=1001)