分类目录归档：Oracle性能优化

在sql profile中使用的过程中,有以下几个问题,这里通过测试确认了几个问题:
1.coe_xfr_sql_profile可以执行sql_id中无PLAN HASH VALUE的执行计划
2.在sql使用过程中,sql profile是否会覆盖hint,通过测试证明sqlprofile可以覆盖hint的执行计划
3.coe_load_sql_profile可以使用于通过修改hint(改变sql id,然后通过指定两次不同的sql id实现sql profile固定hint的sql的执行计划)

测试sqlprofile会影响hint

SQL> create table t_xifenfei as select object_id,object_name from user_objects;

Table created.

SQL> create index idx_t_xifenfei_id on t_xifenfei(OBJECT_ID);

Index created.

SQL> create index idx_t_xifenfei2_id on t_xifenfei(OBJECT_ID,1);

Index created.

---使用hint等方式确定三种方式执行计划
SQL> SET LINES 150
SQL> SET AUTOT  ON
SQL> SET PAGES 150
SQL> select * from t_xifenfei t where OBJECT_ID=10;    <---默认使用IDX_T_XIFENFEI_ID index

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 308895000

-------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                   |     1 |    79 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI        |     1 |    79 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI_ID |     1 |       |     1   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - dynamic sampling used for this statement (level=2)


Statistics
----------------------------------------------------------
          6  recursive calls
          0  db block gets
         13  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

SQL> SET AUTOT OFF

SQL> SET LINES 150
SQL> SET AUTOT  ON
SQL> SET PAGES 150
SQL> select /*+ INDEX(T idx_t_xifenfei2_id)*/* from t_xifenfei t where OBJECT_ID=10;
  <---指定使用idx_t_xifenfei2_id index

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 2143066642

--------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                    |     1 |    79 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI         |     1 |    79 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI2_ID |     1 |       |     1   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - dynamic sampling used for this statement (level=2)


Statistics
----------------------------------------------------------
          4  recursive calls
          0  db block gets
         11  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

SQL> SET AUTOT OFF

SQL> SET LINES 150
SQL> SET AUTOT  ON
SQL> SET PAGES 150
SQL> select /*+ INDEX(T idx_t_xifenfei_id)*/* from t_xifenfei t where OBJECT_ID=10;
  <---指定使用idx_t_xifenfei1_id index

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 308895000

-------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                   |     1 |    79 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI        |     1 |    79 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI_ID |     1 |       |     1   (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - dynamic sampling used for this statement (level=2)


Statistics
----------------------------------------------------------
          4  recursive calls
          0  db block gets
         11  consistent gets
          0  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

SQL> SET AUTOT OFF

--查询三种情况下sql_id
SQL> col SQL_TEXT for a50
SQL> SELECT SQL_TEXT,SQL_ID FROM V$SQL WHERE sql_text like 'select%OBJECT_ID=10';

SQL_TEXT                                           SQL_ID
-------------------------------------------------- -------------
select /*+ INDEX(T idx_t_xifenfei2_id)*/* from t_x 5291sfrd2p35y
ifenfei t where OBJECT_ID=10

select /*+ INDEX(T idx_t_xifenfei_id)*/* from t_xi 143q33ff4f06w
fenfei t where OBJECT_ID=10

select * from t_xifenfei t where OBJECT_ID=10      b5zuac0zqm9nw

--使用sqlprofile固定其他两个未使用index IDX_T_XIFENFEI2_ID的sql使用该索引
SQL> DECLARE
  2   SQL_FTEXT CLOB;
  3   BEGIN
  4   SELECT SQL_FULLTEXT INTO SQL_FTEXT FROM V$SQLAREA WHERE SQL_ID = 'b5zuac0zqm9nw';
  5   DBMS_SQLTUNE.IMPORT_SQL_PROFILE(
  6     SQL_TEXT => SQL_FTEXT,
  7     PROFILE => SQLPROF_ATTR('INDEX(@"SEL$1" "T"@"SEL$1" "IDX_T_XIFENFEI2_ID")'),
  8     NAME => 'PROFILE_b5zuac0zqm9nw',
  9     REPLACE => TRUE,
  10    FORCE_MATCH => TRUE
  11  );
 12   END;
 13   /

PL/SQL procedure successfully completed.

SQL> 
SQL> DECLARE
  2    SQL_FTEXT CLOB;
  3   BEGIN
  4   SELECT SQL_FULLTEXT INTO SQL_FTEXT FROM V$SQLAREA WHERE SQL_ID = '143q33ff4f06w';
  5   DBMS_SQLTUNE.IMPORT_SQL_PROFILE(
  6     SQL_TEXT => SQL_FTEXT,
  7     PROFILE => SQLPROF_ATTR('INDEX(@"SEL$1" "T"@"SEL$1" "IDX_T_XIFENFEI2_ID")'),
  8      NAME => 'PROFILE_143q33ff4f06w',
  9     REPLACE => TRUE,
 10     FORCE_MATCH => TRUE
 11   );
 12   END;
13   / 

PL/SQL procedure successfully completed.

--验证查询效果
SQL> SET LINES 150
SQL> SET AUTOT  ON
SQL> SET PAGES 150
SQL> select * from t_xifenfei t where OBJECT_ID=10;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 2143066642

--------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                    |     1 |    79 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI         |     1 |    79 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI2_ID |     1 |       |     1   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - dynamic sampling used for this statement (level=2)
   - SQL profile "PROFILE_b5zuac0zqm9nw" used for this statement  <--使用sql profile


Statistics
----------------------------------------------------------
         37  recursive calls
          0  db block gets
         23  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          1  sorts (memory)
          0  sorts (disk)
          0  rows processed

SQL> select /*+ INDEX(T idx_t_xifenfei_id)*/* from t_xifenfei t where OBJECT_ID=10;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 2143066642

--------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                    |     1 |    79 |     1   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI         |     1 |    79 |     1   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI2_ID |     1 |       |     1   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - dynamic sampling used for this statement (level=2)
   - SQL profile "PROFILE_143q33ff4f06w" used for this statement 

<--使用sql profile,hint未被正常使用，证明sql profile影响hint，使得sql使用sql profile而不hint


Statistics
----------------------------------------------------------
         10  recursive calls
          0  db block gets
         16  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

这里可以知道,在有sqlprofile的情况下,可以影响以前的hint提示,使得hint无效，继续使用sql profile,感谢北京–weejar的试验证明

使用coe_load_sql_profile方式指定修改sql后的执行计划

SQL> @/tmp/coe_load_sql_profile.sql

Parameter 1:
ORIGINAL_SQL_ID (required)

Enter value for 1: b5zuac0zqm9nw

Parameter 2:
MODIFIED_SQL_ID (required)

Enter value for 2: 5291sfrd2p35y


     PLAN_HASH_VALUE          AVG_ET_SECS
-------------------- --------------------
          2143066642                 .004

Parameter 3:
PLAN_HASH_VALUE (required)

Enter value for 3: 2143066642

Values passed to coe_load_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ORIGINAL_SQL_ID: "b5zuac0zqm9nw"
MODIFIED_SQL_ID: "5291sfrd2p35y"
PLAN_HASH_VALUE: "2143066642"

SQL>BEGIN
  2    IF :sql_text IS NULL THEN
  3      RAISE_APPLICATION_ERROR(-20100, 'SQL_TEXT for original SQL_ID &&original_sql_id.
       was not found in memory (gv$sqltext_with_newlines) or AWR (dba_hist_sqltext).');
  4    END IF;
  5  END;
  6  /
SQL>SET TERM OFF;
SQL>BEGIN
  2    IF :other_xml IS NULL THEN
  3      RAISE_APPLICATION_ERROR(-20101, 'PLAN for modified SQL_ID &&modified_sql_id. and PHV &&plan_hash_value.
         was not found in memory (gv$sql_plan) or AWR (dba_hist_sql_plan).');
  4    END IF;
  5  END;
  6  /
SQL>
SQL>SET ECHO OFF;
0001 BEGIN_OUTLINE_DATA
0002 IGNORE_OPTIM_EMBEDDED_HINTS
0003 OPTIMIZER_FEATURES_ENABLE('11.2.0.4')
0004 DB_VERSION('11.2.0.4')
0005 ALL_ROWS
0006 OUTLINE_LEAF(@"SEL$1")
0007 INDEX_RS_ASC(@"SEL$1" "T"@"SEL$1" "IDX_T_XIFENFEI2_ID")
0008 END_OUTLINE_DATA
dropping staging table "STGTAB_SQLPROF_B5ZUAC0ZQM9NW"
creating staging table "STGTAB_SQLPROF_B5ZUAC0ZQM9NW"
packaging new sql profile into staging table "STGTAB_SQLPROF_B5ZUAC0ZQM9NW"

PROFILE_NAME
------------------------------
B5ZUAC0ZQM9NW_2143066642
SQL>REM
SQL>REM SQL Profile
SQL>REM ~~~~~~~~~~~
SQL>REM
SQL>SELECT signature, name, category, type, status
  2    FROM dba_sql_profiles WHERE name = :name;

           SIGNATURE NAME                           CATEGORY                       TYPE    STATUS
-------------------- ------------------------------ ------------------------------ ------- --------
 6715790053022671751 B5ZUAC0ZQM9NW_2143066642       DEFAULT                        MANUAL  ENABLED
SQL>SET ECHO OFF;

****************************************************************************
* Enter CHF password to export staging table STGTAB_SQLPROF_b5zuac0zqm9nw
****************************************************************************

Export: Release 11.2.0.4.0 - Production on Mon Jun 1 00:10:11 2015

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Password: 

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses ZHS16GBK character set (possible charset conversion)
Note: grants on tables/views/sequences/roles will not be exported
Note: indexes on tables will not be exported
Note: constraints on tables will not be exported

About to export specified tables via Conventional Path ...
. . exporting table   STGTAB_SQLPROF_B5ZUAC0ZQM9NW          1 rows exported
Export terminated successfully without warnings.


If you need to implement this Custom SQL Profile on a similar system,
import and unpack using these commands:

imp CHF file=STGTAB_SQLPROF_b5zuac0zqm9nw.dmp tables=STGTAB_SQLPROF_b5zuac0zqm9nw ignore=Y

BEGIN
DBMS_SQLTUNE.UNPACK_STGTAB_SQLPROF (
profile_name => 'B5ZUAC0ZQM9NW_2143066642',
replace => TRUE,
staging_table_name => 'STGTAB_SQLPROF_b5zuac0zqm9nw',
staging_schema_owner => 'CHF' );
END;
/

updating: coe_load_sql_profile_b5zuac0zqm9nw.log (deflated 76%)
updating: STGTAB_SQLPROF_b5zuac0zqm9nw.dmp (deflated 89%)
  adding: coe_load_sql_profile.log (deflated 62%)

deleting: coe_load_sql_profile.log


coe_load_sql_profile completed.

SQL>SET LINES 150
SQL>SET AUTOT  ON
SQL>SET PAGES 150
select * from t_xifenfei t where OBJECT_ID=10;SQL>

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 2143066642

--------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                    |     6 |   474 |     3   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI         |     6 |   474 |     3   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI2_ID |     2 |       |     2   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - SQL profile "B5ZUAC0ZQM9NW_2143066642" used for this statement   
<------sql直接使用coe_load_sql_profile固定执行计划成功


Statistics
----------------------------------------------------------
          7  recursive calls
          0  db block gets
          7  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

使用coe_load_sql_profile也可以sql_id中没有PLAN HASH VALUE的执行计划,另外还可以实现直接把sqlprofile直接迁移到其他库中

coe_xfr_sql_profile固定没有sql_id没有直接PLAN HASH VALUE的执行计划

SQL> @/tmp/coe_xfr_sql_profile

Parameter 1:
SQL_ID (required)

Enter value for 1: b5zuac0zqm9nw


PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
      308895000        .005

Parameter 2:
PLAN_HASH_VALUE (required)

Enter value for 2: 2143066642     <---该PLAN_HASH_VALUE不存在该sql_id对应的PLAN_HASH_VALUE中

Values passed to coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID         : "b5zuac0zqm9nw"
PLAN_HASH_VALUE: "2143066642"

SQL>BEGIN
  2    IF :sql_text IS NULL THEN
  3      RAISE_APPLICATION_ERROR(-20100, 'SQL_TEXT for SQL_ID &&sql_id. was not 
      found in memory (gv$sqltext_with_newlines) or AWR (dba_hist_sqltext).');
  4    END IF;
  5  END;
  6  /
SQL>SET TERM OFF;
SQL>BEGIN
  2    IF :other_xml IS NULL THEN
  3      RAISE_APPLICATION_ERROR(-20101, 'PLAN for SQL_ID &&sql_id. and PHV &&plan_hash_value.
      was not found in memory (gv$sql_plan) or AWR (dba_hist_sql_plan).');
  4    END IF;
  5  END;
  6  /
SQL>SET TERM OFF;

Execute coe_xfr_sql_profile_b5zuac0zqm9nw_2143066642.sql
on TARGET system in order to create a custom SQL Profile
with plan 2143066642 linked to adjusted sql_text.


COE_XFR_SQL_PROFILE completed.
SQL>@coe_xfr_sql_profile_b5zuac0zqm9nw_2143066642.sql
SQL>REM
SQL>REM $Header: 215187.1 coe_xfr_sql_profile_b5zuac0zqm9nw_2143066642.sql 11.4.4.4 2015/06/01 carlos.sierra $
SQL>REM
SQL>REM Copyright (c) 2000-2012, Oracle Corporation. All rights reserved.
SQL>REM
SQL>REM AUTHOR
SQL>REM   carlos.sierra@oracle.com
SQL>REM
SQL>REM SCRIPT
SQL>REM   coe_xfr_sql_profile_b5zuac0zqm9nw_2143066642.sql
SQL>REM
SQL>REM DESCRIPTION
SQL>REM   This script is generated by coe_xfr_sql_profile.sql
SQL>REM   It contains the SQL*Plus commands to create a custom
SQL>REM   SQL Profile for SQL_ID b5zuac0zqm9nw based on plan hash
SQL>REM   value 2143066642.
SQL>REM   The custom SQL Profile to be created by this script
SQL>REM   will affect plans for SQL commands with signature
SQL>REM   matching the one for SQL Text below.
SQL>REM   Review SQL Text and adjust accordingly.
SQL>REM
SQL>REM PARAMETERS
SQL>REM   None.
SQL>REM
SQL>REM EXAMPLE
SQL>REM   SQL> START coe_xfr_sql_profile_b5zuac0zqm9nw_2143066642.sql;
SQL>REM
SQL>REM NOTES
SQL>REM   1. Should be run as SYSTEM or SYSDBA.
SQL>REM   2. User must have CREATE ANY SQL PROFILE privilege.
SQL>REM   3. SOURCE and TARGET systems can be the same or similar.
SQL>REM   4. To drop this custom SQL Profile after it has been created:
SQL>REM  EXEC DBMS_SQLTUNE.DROP_SQL_PROFILE('coe_b5zuac0zqm9nw_2143066642');
SQL>REM   5. Be aware that using DBMS_SQLTUNE requires a license
SQL>REM  for the Oracle Tuning Pack.
SQL>REM   6. If you modified a SQL putting Hints in order to produce a desired
SQL>REM  Plan, you can remove the artifical Hints from SQL Text pieces below.
SQL>REM  By doing so you can create a custom SQL Profile for the original
SQL>REM  SQL but with the Plan captured from the modified SQL (with Hints).
SQL>REM
SQL>WHENEVER SQLERROR EXIT SQL.SQLCODE;
SQL>REM
SQL>VAR signature NUMBER;
SQL>VAR signaturef NUMBER;
SQL>REM
SQL>DECLARE
  2  sql_txt CLOB;
  3  h       SYS.SQLPROF_ATTR;
  4  PROCEDURE wa (p_line IN VARCHAR2) IS
  5  BEGIN
  6  DBMS_LOB.WRITEAPPEND(sql_txt, LENGTH(p_line), p_line);
  7  END wa;
  8  BEGIN
  9  DBMS_LOB.CREATETEMPORARY(sql_txt, TRUE);
 10  DBMS_LOB.OPEN(sql_txt, DBMS_LOB.LOB_READWRITE);
 11  -- SQL Text pieces below do not have to be of same length.
 12  -- So if you edit SQL Text (i.e. removing temporary Hints),
 13  -- there is no need to edit or re-align unmodified pieces.
 14  wa(q'[select * from t_xifenfei t where OBJECT_ID=10]');
 15  DBMS_LOB.CLOSE(sql_txt);
 16  h := SYS.SQLPROF_ATTR(
 17  q'[BEGIN_OUTLINE_DATA]',
 18  q'[IGNORE_OPTIM_EMBEDDED_HINTS]',
 19  q'[OPTIMIZER_FEATURES_ENABLE('11.2.0.4')]',
 20  q'[DB_VERSION('11.2.0.4')]',
 21  q'[ALL_ROWS]',
 22  q'[OUTLINE_LEAF(@"SEL$1")]',
 23  q'[INDEX_RS_ASC(@"SEL$1" "T"@"SEL$1" "IDX_T_XIFENFEI2_ID")]',
 24  q'[END_OUTLINE_DATA]');
 25  :signature := DBMS_SQLTUNE.SQLTEXT_TO_SIGNATURE(sql_txt);
 26  :signaturef := DBMS_SQLTUNE.SQLTEXT_TO_SIGNATURE(sql_txt, TRUE);
 27  DBMS_SQLTUNE.IMPORT_SQL_PROFILE (
 28  sql_text    => sql_txt,
 29  profile     => h,
 30  name        => 'coe_b5zuac0zqm9nw_2143066642',
 31  description => 'coe b5zuac0zqm9nw 2143066642 '||:signature||' '||:signaturef||'',
 32  category    => 'DEFAULT',
 33  validate    => TRUE,
 34  replace     => TRUE,
 35  force_match => FALSE /* TRUE:FORCE (match even when different literals in SQL). 
     FALSE:EXACT (similar to CURSOR_SHARING) */ );
 36  DBMS_LOB.FREETEMPORARY(sql_txt);
 37  END;
 38  /

PL/SQL procedure successfully completed.

SQL>WHENEVER SQLERROR CONTINUE
SQL>SET ECHO OFF;

            SIGNATURE
---------------------
  6715790053022671751


           SIGNATUREF
---------------------
   445801536248906164


... manual custom SQL Profile has been created


COE_XFR_SQL_PROFILE_b5zuac0zqm9nw_2143066642 completed
SQL>set autot on
SQL>set lines 150
SQL>set pages 150
SQL>select * from t_xifenfei t where OBJECT_ID=10;

no rows selected


Execution Plan
----------------------------------------------------------
Plan hash value: 2143066642

--------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name               | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                    |     6 |   474 |     3   (0)| 00:00:01 |
|   1 |  TABLE ACCESS BY INDEX ROWID| T_XIFENFEI         |     6 |   474 |     3   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | IDX_T_XIFENFEI2_ID |     2 |       |     2   (0)| 00:00:01 |
--------------------------------------------------------------------------------------------------

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

   2 - access("OBJECT_ID"=10)

Note
-----
   - SQL profile "coe_b5zuac0zqm9nw_2143066642" used for this statement


Statistics
----------------------------------------------------------
          7  recursive calls
          0  db block gets
          7  consistent gets
          1  physical reads
          0  redo size
        410  bytes sent via SQL*Net to client
        513  bytes received via SQL*Net from client
          1  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          0  rows processed

SQL>

通过验证，证明在sql_id中没有对应的PLAN HASH VALUE之时，也可以通过coe_xfr_sql_profile指定PLAN HASH VALUE来固定某个sql_id的执行计划.
以前写过相关关于sql profile的文章:sql profile 使用,执行计划改变导致数据库负载过高