SQL Profile 實驗02
實驗說明：本實驗利用工具coe_xfr_sql_profile.sql改變執行計劃。
實驗描述：透過建立表T3和索引T3_INDEX,執行SQL語句，正常情況下該走索引A情況，透過hint強制查詢走全表掃描B情況，利用profile將A情況的執行計劃改為B情況的執行計劃，從而達到利用SQL Profile更改SQL執行計劃，讓所有查詢走全表掃描的目的。（本文僅用於便於理解profile改變執行計劃使用）
##建立測試表和資料
SQL> conn scott/tiger;
Connected.
SQL> create table t3 as select * from all_objects;
Table created.
SQL> create index t3_index on t3(object_id);
Index created.
##開啟trace跟蹤
SQL> set autotrace trace explain;
##正常執行查詢SQL，其走索引
SQL> select count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 129501593
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 9 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | INDEX RANGE SCAN| T3_INDEX | 2500 | 32500 | 9 (0)| 00:00:01 |
------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("OBJECT_ID"<=5000)
Note
-----
- dynamic sampling used for this statement (level=2)
##給執行的SQL加hint，強制走全表掃描
SQL> select /*+full(t3)*/ count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 463314188
---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 327 (1)| 00:00:04 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | TABLE ACCESS FULL| T3 | 2500 | 32500 | 327 (1)| 00:00:04 |
---------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("OBJECT_ID"<=5000)
Note
-----
- dynamic sampling used for this statement (level=2)
#查詢SQL_ID,PLAN_HASH_VALUE,SQL_TEXT內容
SQL> col sql_id for a20;
SQL> col sql_text for a100;
SQL> set linesize 200;
SQL> set pagesize 20000;
SQL> conn /as sysdba;
SQL> select sql_id,plan_hash_value,sql_text from v$sql where sql_text like '%count(*)%t3%where%';
SQL_ID PLAN_HASH_VALUE SQL_TEXT
------------- --------------- ------------------------------------------------------------------------------------------------------------------------
4jtu9dktxjhgk 129501593 EXPLAIN PLAN SET STATEMENT_ID='PLUS735315' FOR select count(*) from t3 where object_id<=5000
01zbb82vy2af3 463314188 EXPLAIN PLAN SET STATEMENT_ID='PLUS735315' FOR select /*+full(t3)*/ count(*) from t3 where object_id<=5000
0gmwrzua0usax 129501593 select count(*) from t3 where object_id<=5000
fdv618tykuv26 463314188 select /*+full(t3)*/ count(*) from t3 where object_id<=5000
5872fg2ftfz76 903671040 select sql_id,sql_text from v$sql where sql_text like '%count(*)%t3%where%'
4qunptrts3tpg 903671040 select sql_id,plan_hash_value,sql_text from v$sql where sql_text like '%count(*)%t3%where%'
##根據要修改的SQL_ID生成Profile檔案，其中讓本走索引的SQL_ID走全表掃描的執行計劃
SQL> @coe_xfr_sql_profile.sql
Parameter 1:
SQL_ID (required)
Enter value for 1: 0gmwrzua0usax ##要修改的SQL語句的SQL_ID
PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
129501593
Parameter 2:
PLAN_HASH_VALUE (required)
Enter value for 2: 463314188 ##將來要實現的SQL執行計劃的PLAN_HASH_VALUE
Values passed to coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID : "0gmwrzua0usax"
PLAN_HASH_VALUE: "463314188"
SQL>BEGIN
2 IF :sql_text IS NULL THEN
3 RAISE_APPLICATION_ERROR(-20100, 'SQL_TEXT for SQL_ID &&sql_id. was not found in memory (gv$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_0gmwrzua0usax_463314188.sql
on TARGET system in order to create a custom SQL Profile
with plan 463314188 linked to adjusted sql_text.
COE_XFR_SQL_PROFILE completed.
#執行Profile匯入操作
SQL>@coe_xfr_sql_profile_0gmwrzua0usax_463314188.sql
SQL>REM
SQL>REM $Header: 215187.1 coe_xfr_sql_profile_0gmwrzua0usax_463314188.sql 11.4.4.4 2016/04/05 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_0gmwrzua0usax_463314188.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 0gmwrzua0usax based on plan hash
SQL>REM value 463314188.
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_0gmwrzua0usax_463314188.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_0gmwrzua0usax_463314188');
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 count(*) from t3 where object_id<=5000]');
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'[FULL(@"SEL$1" "T3"@"SEL$1")]',
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_0gmwrzua0usax_463314188',
31 description => 'coe 0gmwrzua0usax 463314188 '||: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
---------------------
3834930897575772753
SIGNATUREF
---------------------
15295415828971277362
... manual custom SQL Profile has been created
COE_XFR_SQL_PROFILE_0gmwrzua0usax_463314188 completed
#測試執行計劃是不是用到profile，並且走全表掃描
SQL> select count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 463314188
---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 277 (1)| 00:00:04 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | TABLE ACCESS FULL| T3 | 4129 | 53677 | 277 (1)| 00:00:04 |
---------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("OBJECT_ID"<=5000)
Note
-----
- SQL profile "coe_0gmwrzua0usax_463314188" used for this statement
實驗描述：透過建立表T3和索引T3_INDEX,執行SQL語句，正常情況下該走索引A情況，透過hint強制查詢走全表掃描B情況，利用profile將A情況的執行計劃改為B情況的執行計劃，從而達到利用SQL Profile更改SQL執行計劃，讓所有查詢走全表掃描的目的。（本文僅用於便於理解profile改變執行計劃使用）
##建立測試表和資料
SQL> conn scott/tiger;
Connected.
SQL> create table t3 as select * from all_objects;
Table created.
SQL> create index t3_index on t3(object_id);
Index created.
##開啟trace跟蹤
SQL> set autotrace trace explain;
##正常執行查詢SQL，其走索引
SQL> select count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 129501593
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 9 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | INDEX RANGE SCAN| T3_INDEX | 2500 | 32500 | 9 (0)| 00:00:01 |
------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("OBJECT_ID"<=5000)
Note
-----
- dynamic sampling used for this statement (level=2)
##給執行的SQL加hint，強制走全表掃描
SQL> select /*+full(t3)*/ count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 463314188
---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 327 (1)| 00:00:04 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | TABLE ACCESS FULL| T3 | 2500 | 32500 | 327 (1)| 00:00:04 |
---------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("OBJECT_ID"<=5000)
Note
-----
- dynamic sampling used for this statement (level=2)
#查詢SQL_ID,PLAN_HASH_VALUE,SQL_TEXT內容
SQL> col sql_id for a20;
SQL> col sql_text for a100;
SQL> set linesize 200;
SQL> set pagesize 20000;
SQL> conn /as sysdba;
SQL> select sql_id,plan_hash_value,sql_text from v$sql where sql_text like '%count(*)%t3%where%';
SQL_ID PLAN_HASH_VALUE SQL_TEXT
------------- --------------- ------------------------------------------------------------------------------------------------------------------------
4jtu9dktxjhgk 129501593 EXPLAIN PLAN SET STATEMENT_ID='PLUS735315' FOR select count(*) from t3 where object_id<=5000
01zbb82vy2af3 463314188 EXPLAIN PLAN SET STATEMENT_ID='PLUS735315' FOR select /*+full(t3)*/ count(*) from t3 where object_id<=5000
0gmwrzua0usax 129501593 select count(*) from t3 where object_id<=5000
fdv618tykuv26 463314188 select /*+full(t3)*/ count(*) from t3 where object_id<=5000
5872fg2ftfz76 903671040 select sql_id,sql_text from v$sql where sql_text like '%count(*)%t3%where%'
4qunptrts3tpg 903671040 select sql_id,plan_hash_value,sql_text from v$sql where sql_text like '%count(*)%t3%where%'
##根據要修改的SQL_ID生成Profile檔案，其中讓本走索引的SQL_ID走全表掃描的執行計劃
SQL> @coe_xfr_sql_profile.sql
Parameter 1:
SQL_ID (required)
Enter value for 1: 0gmwrzua0usax ##要修改的SQL語句的SQL_ID
PLAN_HASH_VALUE AVG_ET_SECS
--------------- -----------
129501593
Parameter 2:
PLAN_HASH_VALUE (required)
Enter value for 2: 463314188 ##將來要實現的SQL執行計劃的PLAN_HASH_VALUE
Values passed to coe_xfr_sql_profile:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
SQL_ID : "0gmwrzua0usax"
PLAN_HASH_VALUE: "463314188"
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_0gmwrzua0usax_463314188.sql
on TARGET system in order to create a custom SQL Profile
with plan 463314188 linked to adjusted sql_text.
COE_XFR_SQL_PROFILE completed.
#執行Profile匯入操作
SQL>@coe_xfr_sql_profile_0gmwrzua0usax_463314188.sql
SQL>REM
SQL>REM $Header: 215187.1 coe_xfr_sql_profile_0gmwrzua0usax_463314188.sql 11.4.4.4 2016/04/05 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_0gmwrzua0usax_463314188.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 0gmwrzua0usax based on plan hash
SQL>REM value 463314188.
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_0gmwrzua0usax_463314188.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_0gmwrzua0usax_463314188');
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 count(*) from t3 where object_id<=5000]');
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'[FULL(@"SEL$1" "T3"@"SEL$1")]',
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_0gmwrzua0usax_463314188',
31 description => 'coe 0gmwrzua0usax 463314188 '||: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
---------------------
3834930897575772753
SIGNATUREF
---------------------
15295415828971277362
... manual custom SQL Profile has been created
COE_XFR_SQL_PROFILE_0gmwrzua0usax_463314188 completed
#測試執行計劃是不是用到profile，並且走全表掃描
SQL> select count(*) from t3 where object_id<=5000;
Execution Plan
----------------------------------------------------------
Plan hash value: 463314188
---------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 277 (1)| 00:00:04 |
| 1 | SORT AGGREGATE | | 1 | 13 | | |
|* 2 | TABLE ACCESS FULL| T3 | 4129 | 53677 | 277 (1)| 00:00:04 |
---------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - filter("OBJECT_ID"<=5000)
Note
-----
- SQL profile "coe_0gmwrzua0usax_463314188" used for this statement
來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/27067062/viewspace-2075505/，如需轉載，請註明出處，否則將追究法律責任。
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