SQL> set serveroutput off ? ?--一定要關
SQL> ?select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED'));


PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID ?5qgz1p0cut7mx, child number 0


BEGIN DBMS_OUTPUT.DISABLE; END;


NOTE: cannot fetch plan for SQL_ID: 5qgz1p0cut7mx, CHILD_NUMBER: 0
? ? ? Please verify value of SQL_ID and CHILD_NUMBER;
? ? ? It could also be that the plan is no longer in cursor cache (check v$sql_plan)




已選擇8行。


SQL> select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));


PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID ?7xdg8akqchn1t, child number 1
-------------------------------------
?select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED'))


Plan hash value: 3713220770


---------------------------------------------------------------------
| Id ?| Operation ? ? ? ? ? ? ? ? ? ? ? ? | Name ? ? ? ? ? | E-Rows |
---------------------------------------------------------------------
| ? 0 | SELECT STATEMENT ? ? ? ? ? ? ? ? ?| ? ? ? ? ? ? ? ?| ? ? ? ?|
| ? 1 | ?COLLECTION ITERATOR PICKLER FETCH| DISPLAY_CURSOR | ? ? 16 |
---------------------------------------------------------------------


Note
-----
? ?- cardinality feedback used for this statement
? ?- 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




已選擇20行。


SQL> ?select count(*) from t1 where object_id between :x and :y;


? COUNT(*)
----------
? ? 145152


SQL> select * from table(dbms_xplan.display_cursor(null,null,'ADVANCED'));


PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID ?1ynfbm8a0p98u, child number 0
-------------------------------------
?select count(*) from t1 where object_id between :x and :y


Plan hash value: 1410530761


---------------------------------------------------------------------------------
| Id ?| Operation ? ? ? ? ? ? ?| Name ? | Rows ?| Bytes | Cost (%CPU)| Time ? ? |
---------------------------------------------------------------------------------
| ? 0 | SELECT STATEMENT ? ? ? | ? ? ? ?| ? ? ? | ? ? ? | ? ?91 (100)| ? ? ? ? ?|
| ? 1 | ?SORT AGGREGATE ? ? ? ?| ? ? ? ?| ? ? 1 | ? ? 5 | ? ? ? ? ? ?| ? ? ? ? ?|
|* ?2 | ? FILTER ? ? ? ? ? ? ? | ? ? ? ?| ? ? ? | ? ? ? | ? ? ? ? ? ?| ? ? ? ? ?|
|* ?3 | ? ?INDEX FAST FULL SCAN| IDX_T1 | ? 145K| ? 708K| ? ?91 ? (3)| 00:00:02 |
---------------------------------------------------------------------------------


Query Block Name / Object Alias (identified by operation id):
-------------------------------------------------------------


? ?1 - SEL$1
? ?3 - SEL$1 / T1@SEL$1


Outline Data
-------------


? /*+
? ? ? BEGIN_OUTLINE_DATA
? ? ? IGNORE_OPTIM_EMBEDDED_HINTS
? ? ? OPTIMIZER_FEATURES_ENABLE('11.2.0.1')
? ? ? DB_VERSION('11.2.0.1')
? ? ? ALL_ROWS
? ? ? OUTLINE_LEAF(@"SEL$1")
? ? ? INDEX_FFS(@"SEL$1" "T1"@"SEL$1" ("T1"."OBJECT_ID"))
? ? ? END_OUTLINE_DATA
? */


Peeked Binds (identified by position):
--------------------------------------


? ?1 - :X (NUMBER): 0
? ?2 - :Y (NUMBER): 100000


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


? ?2 - filter(:X<=:Y)
? ?3 - filter(("OBJECT_ID">=:X AND "OBJECT_ID"<=:Y))


Column Projection Information (identified by operation id):
-----------------------------------------------------------


? ?1 - (#keys=0) COUNT(*)[22]




已選擇52行。

轉載于:https://www.cnblogs.com/kool/p/6695600.html

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