Oracle执行计划的稳定（使用MANUAL类型的SQL PROFILE）

其他 2020-01-14 12:29:42 阅读次数: 0

使用MANUAL类型的SQL PROFILE来稳定执行计划

手动类型的SQL PROFILE总的来说就修改HINT，就是将COST较少的HINT部分复制到COST较多的里面去。就是执行计划中的Outline Data部分。

1、环境准备

SCOTT@TNS_PDB01>create table t1(n number);

Table created.

SCOTT@TNS_PDB01>ed
Wrote file afiedt.buf

  1  declare
  2  begin
  3  	for i in 1 .. 10000 loop
  4  		insert into t1 values(i);
  5  	end loop;
  6  	commit;
  7* end;
  8  /

PL/SQL procedure successfully completed.

SCOTT@TNS_PDB01>select count(*) from t1;

  COUNT(*)
----------
     10000

SCOTT@TNS_PDB01>create index idx_t1 on t1(n);

Index created.

SCOTT@TNS_PDB01>exec dbms_stats.gather_table_stats(ownname => 'SCOTT',tabname => 'T1',estimate_percent => 100,cascade => true,no_invalidate => false);

PL/SQL procedure successfully completed.

2、分别使用NO_INDEX和INDEX执行下列语句生成不同的执行计划

SCOTT@TNS_PDB01>select /*+ no_index(t1 idx_t1) */* from t1 where n = 5;

	 N
----------
	 5

SCOTT@TNS_PDB01>select /*+ index(t1 idx_t1) */* from t1 where n = 5;

	 N
----------
	 5

SCOTT@TNS_PDB01>select sql_text,sql_id,plan_hash_value,version_count,executions from v$sqlarea where sql_text like '%from t1 where n = 5%';

SQL_TEXT			    SQL_ID	  PLAN_HASH_VALUE VERSION_COUNT EXECUTIONS
----------------------------------- ------------- --------------- ------------- ----------
select sql_text,sql_id,plan_hash_va cn3cdtrt0scbj	232555890	      1 	 1
lue,version_count,executions from v
$sqlarea where sql_text like '%from
 t1 where n = 5%'

select /*+ no_index(t1 idx_t1) */*  6km0nbhw11mvq      3617692013	      1 	 3
from t1 where n = 5

select /*+ index(t1 idx_t1) */* fro 0j50kmxrzm6nh      1369807930	      1 	 3
m t1 where n = 5

SCOTT@TNS_PDB01>select * from table(dbms_xplan.display_cursor(sql_id => '6km0nbhw11mvq',cursor_child_no => 0,format => 'advanced'));

PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------------------------------
SQL_ID	6km0nbhw11mvq, child number 0
-------------------------------------
select /*+ no_index(t1 idx_t1) */* from t1 where n = 5

Plan hash value: 3617692013

--------------------------------------------------------------------------
| Id  | Operation	  | Name | Rows  | Bytes | Cost (%CPU)| Time	 |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |	 |	 |	 |     7 (100)| 	 |
|*  1 |  TABLE ACCESS FULL| T1	 |     1 |     4 |     7   (0)| 00:00:01 |
--------------------------------------------------------------------------

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

   1 - SEL$1 / T1@SEL$1

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

  /*+
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('19.1.0')
      DB_VERSION('19.1.0')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$1")
      FULL(@"SEL$1" "T1"@"SEL$1")
      END_OUTLINE_DATA
  */

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

   1 - filter("N"=5)

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

   1 - "N"[NUMBER,22]

Hint Report (identified by operation id / Query Block Name / Object Alias):
Total hints for statement: 1
---------------------------------------------------------------------------

   1 -	SEL$1 / T1@SEL$1
	   -  no_index(t1 idx_t1)

Query Block Registry:
---------------------

  <q o="2" f="y"><n><![CDATA[SEL$1]]></n><f><h><t><![CDATA[T1]]></t><s><![
	CDATA[SEL$1]]></s></h></f></q>



56 rows selected.

SCOTT@TNS_PDB01>select * from table(dbms_xplan.display_cursor(sql_id => '0j50kmxrzm6nh',cursor_child_no => 0,format => 'advanced'));

PLAN_TABLE_OUTPUT
---------------------------------------------------------------------------------------------------------------
SQL_ID	0j50kmxrzm6nh, child number 0
-------------------------------------
select /*+ index(t1 idx_t1) */* from t1 where n = 5

Plan hash value: 1369807930

---------------------------------------------------------------------------
| Id  | Operation	 | Name   | Rows  | Bytes | Cost (%CPU)| Time	  |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT |	  |	  |	  |	1 (100)|	  |
|*  1 |  INDEX RANGE SCAN| IDX_T1 |	1 |	4 |	1   (0)| 00:00:01 |
---------------------------------------------------------------------------

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

   1 - SEL$1 / T1@SEL$1

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

  /*+
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('19.1.0')
      DB_VERSION('19.1.0')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$1")
      INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))
      END_OUTLINE_DATA
  */

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

   1 - access("N"=5)

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

   1 - "N"[NUMBER,22]

Hint Report (identified by operation id / Query Block Name / Object Alias):
Total hints for statement: 1
---------------------------------------------------------------------------

   1 -	SEL$1 / T1@SEL$1
	   -  index(t1 idx_t1)

Query Block Registry:
---------------------

  <q o="2" f="y"><n><![CDATA[SEL$1]]></n><f><h><t><![CDATA[T1]]></t><s><![
	CDATA[SEL$1]]></s></h></f></q>



56 rows selected.

上传MOS文档上的 coe_xfr_sql_profile.sql到Oracle

[oracle@kkk ~]$ ls -l coe_xfr_sql_profile.sql
-rw-r–r-- 1 oracle oinstall 12957 Jan 13 13:12 coe_xfr_sql_profile.sql

3、使用NO_INDEX的SQL_ID和PLAN_HASH_VALUE执行脚本 coe_xfr_sql_profile.sql

SCOTT@TNS_PDB01>@/home/oracle/coe_xfr_sql_profile.sql

Parameter 1:
SQL_ID (required)

Enter value for 1: 6km0nbhw11mvq


PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
     3617692013        .025

Parameter 2:
PLAN_HASH_VALUE (required)

Enter value for 2: 3617692013

Values passed to coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID	       : "6km0nbhw11mvq"
PLAN_HASH_VALUE: "3617692013"

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_6km0nbhw11mvq_3617692013.sql
on TARGET system in order to create a custom SQL Profile
with plan 3617692013 linked to adjusted sql_text.


COE_XFR_SQL_PROFILE completed.

SQL>host ls -l /home/oracle/coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql
-rw-r--r-- 1 oracle oinstall 2514 Jan 13 15:37 /home/oracle/coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql

4、INDEX的SQL_ID和PLAN_HASH_VALUE执行脚本 coe_xfr_sql_profile.sql

SQL>@/home/oracle/coe_xfr_sql_profile.sql

Parameter 1:
SQL_ID (required)

Enter value for 1: 0j50kmxrzm6nh


PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
     1369807930        .008

Parameter 2:
PLAN_HASH_VALUE (required)

Enter value for 2: 1369807930

Values passed to coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID	       : "0j50kmxrzm6nh"
PLAN_HASH_VALUE: "1369807930"

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_0j50kmxrzm6nh_1369807930.sql
on TARGET system in order to create a custom SQL Profile
with plan 1369807930 linked to adjusted sql_text.


COE_XFR_SQL_PROFILE completed.
SQL>
SQL>
SQL>host ls -l /home/oracle/coe_xfr_sql_profile_0j50kmxrzm6nh_1369807930.sql
-rw-r--r-- 1 oracle oinstall 2523 Jan 13 15:39 /home/oracle/coe_xfr_sql_profile_0j50kmxrzm6nh_1369807930.sql

5、将 /home/oracle/coe_xfr_sql_profile_0j50kmxrzm6nh_1369807930.sql中Hint部分替换到/home/oracle/coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql中Hint并将force_match修改为true后执行home/oracle/coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql脚本

SQL>@/home/oracle/coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql
SQL>REM
SQL>REM $Header: 215187.1 coe_xfr_sql_profile_6km0nbhw11mvq_3617692013.sql 11.4.3.5 2020/01/13 carlos.sierra $
SQL>REM
SQL>REM Copyright (c) 2000-2011, 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_6km0nbhw11mvq_3617692013.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 6km0nbhw11mvq based on plan hash
SQL>REM   value 3617692013.
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_6km0nbhw11mvq_3617692013.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_6km0nbhw11mvq_3617692013');
SQL>REM   5. Be aware that using DBMS_SQLTUNE requires a license
SQL>REM	 for the Oracle Tuning Pack.
SQL>REM
SQL>WHENEVER SQLERROR EXIT SQL.SQLCODE;
SQL>REM
SQL>VAR signature NUMBER;
SQL>REM
SQL>DECLARE
  2  sql_txt CLOB;
  3  h	     SYS.SQLPROF_ATTR;
  4  BEGIN
  5  sql_txt := q'[
  6  select /*+ no_index(t1 idx_t1)
  7  */* from t1 where n = 5
  8  ]';
  9  h := SYS.SQLPROF_ATTR(
 10  q'[BEGIN_OUTLINE_DATA]',
 11  q'[IGNORE_OPTIM_EMBEDDED_HINTS]',
 12  q'[OPTIMIZER_FEATURES_ENABLE('19.1.0')]',
 13  q'[DB_VERSION('19.1.0')]',
 14  q'[ALL_ROWS]',
 15  q'[OUTLINE_LEAF(@"SEL$1")]',
 16  q'[INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))]',
 17  q'[END_OUTLINE_DATA]');
 18  :signature := DBMS_SQLTUNE.SQLTEXT_TO_SIGNATURE(sql_txt);
 19  DBMS_SQLTUNE.IMPORT_SQL_PROFILE (
 20  sql_text	 => sql_txt,
 21  profile	 => h,
 22  name	 => 'coe_6km0nbhw11mvq_3617692013',
 23  description => 'coe 6km0nbhw11mvq 3617692013 '||:signature||'',
 24  category	 => 'DEFAULT',
 25  validate	 => TRUE,
 26  replace	 => TRUE,
 27  force_match => TRUE /* TRUE:FORCE (match even when different literals in SQL). FALSE:EXACT (similar to CURSOR_SHARING) */ );
 28  END;
 29  /

PL/SQL procedure successfully completed.

SQL>WHENEVER SQLERROR CONTINUE
SQL>SET ECHO OFF;

	    SIGNATURE
---------------------
  1624786848478586381


... manual custom SQL Profile has been created


COE_XFR_SQL_PROFILE_6km0nbhw11mvq_3617692013 completed

6、测试

SQL>select /*+ no_index(t1 idx_t1) */* from t1 where n = 5;

	 N
----------
	 5

SQL>select * from table(dbms_xplan.display_cursor(sql_id => null,cursor_child_no => null,format => 'advanced'));

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID	6km0nbhw11mvq, child number 0
-------------------------------------
select /*+ no_index(t1 idx_t1) */* from t1 where n = 5

Plan hash value: 1369807930

---------------------------------------------------------------------------
| Id  | Operation	 | Name   | Rows  | Bytes | Cost (%CPU)| Time	  |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT |	  |	  |	  |	1 (100)|	  |
|*  1 |  INDEX RANGE SCAN| IDX_T1 |	1 |	4 |	1   (0)| 00:00:01 |

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------------------------------

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

   1 - SEL$1 / T1@SEL$1

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

  /*+

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('19.1.0')
      DB_VERSION('19.1.0')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$1")
      INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))
      END_OUTLINE_DATA
  */

Predicate Information (identified by operation id):

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------

   1 - access("N"=5)

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

   1 - "N"[NUMBER,22]

Hint Report (identified by operation id / Query Block Name / Object Alias):
Total hints for statement: 6 (U - Unused (1))

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------------------------------

   0 -	STATEMENT
	   -  ALL_ROWS
	   -  DB_VERSION('19.1.0')
	   -  IGNORE_OPTIM_EMBEDDED_HINTS
	   -  OPTIMIZER_FEATURES_ENABLE('19.1.0')

   1 -	SEL$1 / T1@SEL$1
	 U -  no_index(t1 idx_t1) / rejected by IGNORE_OPTIM_EMBEDDED_HINTS
	   -  INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------

Note
-----
   - SQL profile coe_6km0nbhw11mvq_3617692013 used for this statement

Query Block Registry:
---------------------

  <q o="2" f="y"><n><![CDATA[SEL$1]]></n><f><h><t><![CDATA[T1]]></t><s><![
	CDATA[SEL$1]]></s></h></f></q>


PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------


67 rows selected.

发现在使用NO_INDEX的SQL语句中走的索引了。


修改谓词条件
SQL>select /*+ no_index(t1 idx_t1) */* from t1 where n = 7;

	 N
----------
	 7

SQL>select * from table(dbms_xplan.display_cursor(sql_id => null,cursor_child_no => null,format => 'advanced'));

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID	8up3bffqmutxx, child number 0
-------------------------------------
select /*+ no_index(t1 idx_t1) */* from t1 where n = 7

Plan hash value: 1369807930

---------------------------------------------------------------------------
| Id  | Operation	 | Name   | Rows  | Bytes | Cost (%CPU)| Time	  |
---------------------------------------------------------------------------
|   0 | SELECT STATEMENT |	  |	  |	  |	1 (100)|	  |
|*  1 |  INDEX RANGE SCAN| IDX_T1 |	1 |	4 |	1   (0)| 00:00:01 |

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------------------------------

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

   1 - SEL$1 / T1@SEL$1

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

  /*+

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
      BEGIN_OUTLINE_DATA
      IGNORE_OPTIM_EMBEDDED_HINTS
      OPTIMIZER_FEATURES_ENABLE('19.1.0')
      DB_VERSION('19.1.0')
      ALL_ROWS
      OUTLINE_LEAF(@"SEL$1")
      INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))
      END_OUTLINE_DATA
  */

Predicate Information (identified by operation id):

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------

   1 - access("N"=7)

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

   1 - "N"[NUMBER,22]

Hint Report (identified by operation id / Query Block Name / Object Alias):
Total hints for statement: 6 (U - Unused (1))

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
---------------------------------------------------------------------------

   0 -	STATEMENT
	   -  ALL_ROWS
	   -  DB_VERSION('19.1.0')
	   -  IGNORE_OPTIM_EMBEDDED_HINTS
	   -  OPTIMIZER_FEATURES_ENABLE('19.1.0')

   1 -	SEL$1 / T1@SEL$1
	 U -  no_index(t1 idx_t1) / rejected by IGNORE_OPTIM_EMBEDDED_HINTS
	   -  INDEX(@"SEL$1" "T1"@"SEL$1" ("T1"."N"))

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------

Note
-----
   - SQL profile coe_6km0nbhw11mvq_3617692013 used for this statement

Query Block Registry:
---------------------

  <q o="2" f="y"><n><![CDATA[SEL$1]]></n><f><h><t><![CDATA[T1]]></t><s><![
	CDATA[SEL$1]]></s></h></f></q>


PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------


67 rows selected.

修改谓词条件后也走的是索引了，（概要文件中将force_match => TRUE）
Lissen_Gan
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