Plan SPM of locking and detection of new plans

I searched Oracle documentation and wanted to confirm my interpretation on some issues of SPM:

Enabling SPM (giving OPTIMIZER_USE_SQL_PLAN_BASELINES TRUE) does for a database and have captured previously SQL plans, freeze all plans for reruns of the captured SQL statements?


Auto capture plan must always run to see if the optimizer is to come up with new plans for your basic SQL lines? If it was OFF, it seems that new plans for statements in your baseline would be always ignored and you'd be ignorant of new plans.

Thank you

Richard

Enabling SPM (giving OPTIMIZER_USE_SQL_PLAN_BASELINES TRUE) does for a database and have captured previously SQL plans, freeze all plans for reruns of the captured SQL statements?

Yes, depending on how you propose change your plans

Auto capture plan must always run to see if the optimizer is to come up with new plans for your basic SQL lines?

N ° below.

Create a simple table:

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> create table t1
  2  as
  3  select rownum col1
  4  from dual
  5  connect by rownum <= 10;

Table created.

SQL>
SQL> create index i1 on t1 (col1);

Index created.

SQL>

Impose a strange datum plane (so that the optimizer will find an obvious alternative):

SQL> alter session set optimizer_use_sql_plan_baselines = false;

Session altered.

SQL> alter session set optimizer_capture_sql_plan_baselines = false;

Session altered.

SQL> select * from t1 where col1 = 1;

      COL1
----------
         1

SQL> select * from table(dbms_xplan.display_cursor());

PLAN_TABLE_OUTPUT
-----------------------------------------------------------------------------------------
SQL_ID  81qv4d7vkb571, child number 0
-------------------------------------
select * from t1 where col1 = 1

Plan hash value: 1816312439

-------------------------------------------------------------------------
| Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------
|   0 | SELECT STATEMENT |      |       |       |     1 (100)|          |
|*  1 |  INDEX RANGE SCAN| I1   |     1 |    13 |     1   (0)| 00:00:01 |
-------------------------------------------------------------------------

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

   1 - access("COL1"=1)

SQL> select /*+ full (t1) */ * from t1 where col1 = 1;

      COL1
----------
         1

SQL> select * from table(dbms_xplan.display_cursor());

PLAN_TABLE_OUTPUT
-----------------------------------------------------------------------------------------
SQL_ID  2tzbnc6mq1q4z, child number 0
-------------------------------------
select /*+ full (t1) */ * from t1 where col1 = 1

Plan hash value: 3617692013

--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|*  1 |  TABLE ACCESS FULL| T1   |     1 |    13 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------

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

   1 - filter("COL1"=1)

Force the FULL scan in a reference database:

SQL> declare
  2   l_op pls_integer;
  3  begin
  4   l_op :=
  5   dbms_spm.load_plans_from_cursor_cache
  6   (sql_id          => '2tzbnc6mq1q4z',
  7    plan_hash_value => 3617692013,
  8    sql_text        => 'select * from t1 where col1 = 1');
  9  end;
 10  /

PL/SQL procedure successfully completed.

SQL> select to_char(signature) sig, plan_name, created, enabled, accepted
  2  from   dba_sql_plan_baselines
  3  where  signature = (select distinct to_char(exact_matching_signature)
  4                      from   v$sql
  5                      where  sql_id = '81qv4d7vkb571');

SIG                          PLAN_NAME                      CREATED                             ENA ACC
---------------------------- ------------------------------ ----------------------------------- ---
9005682359107037619          SQL_PLAN_7tynwchv97admdbd90e8e 16-JUL-12 05.24.11.000000 PM        YES YES

SQL>

Prove that the base line is used:

SQL> alter session set optimizer_use_sql_plan_baselines = true;

Session altered.

SQL> select * from t1 where col1 = 1;

      COL1
----------
         1

SQL> select * from table(dbms_xplan.display_cursor());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------
SQL_ID  81qv4d7vkb571, child number 3

An uncaught error happened in prepare_sql_statement : ORA-01403: no data found

NOTE: cannot fetch plan for SQL_ID: 81qv4d7vkb571, CHILD_NUMBER: 3
      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)

8 rows selected.

SQL> select * from t1 where col1 = 1;

      COL1
----------
         1

SQL> select * from table(dbms_xplan.display_cursor());

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------
SQL_ID  81qv4d7vkb571, child number 3
-------------------------------------
select * from t1 where col1 = 1

Plan hash value: 3617692013

--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|*  1 |  TABLE ACCESS FULL| T1   |     3 |    39 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------

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

   1 - filter("COL1"=1)

Note
-----
   - SQL plan baseline SQL_PLAN_7tynwchv97admdbd90e8e used for this statement

22 rows selected.

SQL>

And we will check if the other sensitive no accepted plan was captured as an alternative at the time of the analysis even if the capture is turned off.

SQL> select to_char(signature) sig, plan_name, created, enabled, accepted
  2  from   dba_sql_plan_baselines
  3  where  signature = (select distinct to_char(exact_matching_signature)
  4                      from   v$sql
  5                      where  sql_id = '81qv4d7vkb571');

SIG                          PLAN_NAME                      CREATED                             ENA ACC
---------------------------- ------------------------------ ----------------------------------- ---
9005682359107037619          SQL_PLAN_7tynwchv97admdbd90e8e 16-JUL-12 05.24.11.000000 PM        YES YES
9005682359107037619          SQL_PLAN_7tynwchv97adm3218f475 16-JUL-12 05.24.55.000000 PM        YES NO

SQL>

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