sql profile

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE    11.2.0.4.0    Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

SQL> create table test as select * from dba_objects;

Table created.

SQL> create index i_test_id on test(object_id);

Index created.

SQL> exec dbms_stats.gather_table_stats('SYS','TEST',cascade=>true);

PL/SQL procedure successfully completed.

SQL>

+++测试用PROFILE将索引范围扫描的执行计划调整为全表扫扫描
SQL> select object_name from test where object_id=10;

Execution Plan
----------------------------------------------------------
Plan hash value: 2225164668

-----------------------------------------------------------------------------------------
| Id  | Operation            | Name    | Rows    | Bytes | Cost (%CPU)| Time    |
-----------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT        |        |     1 |    30 |     2   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| TEST    |     1 |    30 |     2   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN        | I_TEST_ID |     1 |    |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)
   
SQL> select /*+full(test)*/ object_name from test where object_id=10;

Execution Plan
----------------------------------------------------------
Plan hash value: 1357081020

--------------------------------------------------------------------------
| Id  | Operation      | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |     |     1 |    30 |   337   (1)| 00:00:05 |
|*  1 |  TABLE ACCESS FULL| TEST |     1 |    30 |   337   (1)| 00:00:05 |
--------------------------------------------------------------------------

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

   1 - filter("OBJECT_ID"=10)

SQL> select sql_id,sql_text from v$sql where sql_text like '%from test%';

f9h894yhsf9bb select object_name from test where object_id=10
461yxn1fhgrkk select /*+full(test)*/ object_name from test where object_id=10

+++查看全表扫描执行计划的OUTLINE
SQL> SET PAGESIZE 10000
SQL> select * from table(dbms_xplan.display_cursor('461yxn1fhgrkk',null,'outline'));

PLAN_TABLE_OUTPUT
----------------------------------------------------------------------------------------------------------------------------------
SQL_ID    461yxn1fhgrkk, child number 0
-------------------------------------
select /*+full(test)*/ object_name from test where object_id=10

Plan hash value: 1357081020

--------------------------------------------------------------------------
| Id  | Operation      | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |     |     |     |   337 (100)|      |
|*  1 |  TABLE ACCESS FULL| TEST |     1 |    30 |   337   (1)| 00:00:05 |
--------------------------------------------------------------------------

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

  /*+
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('11.2.0.4')
      DB_VERSION('11.2.0.4')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$1")
      FULL(@"SEL$1" "TEST"@"SEL$1")
      END_OUTLINE_DATA
  */

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

   1 - filter("OBJECT_ID"=10)


32 rows selected.

SQL>

+++创建SQLPROFILE

declare
 v_hints sys.sqlprof_attr;
 begin
 v_hints:=sys.sqlprof_attr(
      'BEGIN_OUTLINE_DATA',
      'IGNORE_OPTIM_EMBEDDED_HINTS',
      'OPTIMIZER_FEATURES_ENABLE(''11.2.0.4'')',
      'DB_VERSION(''11.2.0.4'')',
      'ALL_ROWS',
      'OUTLINE_LEAF(@"SEL$1")',
      'FULL(@"SEL$1" "TEST"@"SEL$1")',   
      'END_OUTLINE_DATA');
dbms_sqltune.import_sql_profile(
'Select object_name from test where object_id=10',
v_hints,'SQLPROFILE_MYPROFILE1',              
force_match=>true,replace=>true);
end;
/

+++验证SQLPROFILE
SQL> set autot trace exp
SQL> select object_name from test where object_id=100;

Execution Plan
----------------------------------------------------------
Plan hash value: 1357081020

--------------------------------------------------------------------------
| Id  | Operation      | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |     |     1 |    30 |   337   (1)| 00:00:05 |
|*  1 |  TABLE ACCESS FULL| TEST |     1 |    30 |   337   (1)| 00:00:05 |
--------------------------------------------------------------------------

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

   1 - filter("OBJECT_ID"=100)

Note
-----
   - SQL profile "SQLPROFILE_MYPROFILE1" used for this statement


+++查看系统当前使用的PROFILE
SQL>  select name,SQL_TEXT,TYPE,STATUS from dba_sql_profiles

NAME               SQL_TEXT                             TYPE    STATUS
---------------------- ------------------------------------------------------------ ------- --------
SQLPROFILE_MYPROFILE1  Select object_name from test where object_id=10            MANUAL  ENABLED