固定執行計劃-SQL PROFILE手工綁定

時間 2019-12-01

標籤固定執行計劃 sql profile 手工綁定欄目快樂工作简体版

原文原文鏈接

固定（穩定）執行計劃html

你的應用的功能時快時慢，變化比較大，功能的性能可以保持一種穩定的狀態，ORACLE 固定執行計劃，採用如下這幾種方式sql

oracle 9i使用 Outline
oracle 10g採用 sql profile
oracle 11g增長了sql plan manage

oracle 10g採用 sql profile ：兩種模式session

從SQL語句歷史的執行計劃，找到一個合理的，進行綁定
還有一種沒法從歷史的執行計劃找到合理的，只能手工構造進行綁定

提供腳本oracle

create_sql_profileide

提供綁定shared pool中已有的執行計劃中，找一個綁定或本身構造一個綁定oop

----------------------------------------------------------------------------------------
--
-- File name:   create_sql_profile.sql
--
-- Purpose:     Create SQL Profile based on Outline hints in V$SQL.OTHER_XML.
--
-- Author:      Kerry Osborne
--
-- Usage:       This scripts prompts for four values.
--
--              sql_id: the sql_id of the statement to attach the profile to (must be in the shared pool),if sql_id is not shared pool,must be bulid sql plan
--
--              child_no: the child_no of the statement from v$sql
--
--              new_sql_id:須要綁定的SQL語句
--
--              profile_name: the name of the profile to be generated
--
--              category: the name of the category for the profile
--
--              force_macthing: a toggle to turn on or off the force_matching feature
--
-- Description:
--
--              Based on a script by Randolf Giest.
--
-- Mods:        This is the 2nd version of this script which removes dependency on rg_sqlprof1.sql.
--
--              See kerryosborne.oracle-guy.com for additional information.
---------------------------------------------------------------------------------------
--

-- @rg_sqlprof1 '&&sql_id' &&child_no '&&new_sql_id' '&&category' '&force_matching'

set feedback off
set sqlblanklines on

accept sql_id -
       prompt 'Enter value for sql_id: ' -
       default 'X0X0X0X0'
accept child_no -
       prompt 'Enter value for child_no (0): ' -
       default '0'
accept new_sql_id -
       prompt 'Enter value for new_sql_id: ' -
       default '0'
accept profile_name -
       prompt 'Enter value for profile_name (PROF_sqlid_planhash): ' -
       default 'X0X0X0X0'
accept category -
       prompt 'Enter value for category (DEFAULT): ' -
       default 'DEFAULT'
accept force_matching -
       prompt 'Enter value for force_matching (TRUE): ' -
       default 'TRUE'

declare
ar_profile_hints sys.sqlprof_attr;
cl_sql_text clob;
l_profile_name varchar2(30);
begin
select
extractvalue(value(d), '/hint') as outline_hints
bulk collect
into
ar_profile_hints
from
xmltable('/*/outline_data/hint'
passing (
select
xmltype(other_xml) as xmlval
from
v$sql_plan
where
sql_id = '&&sql_id'
and child_number = &&child_no
and other_xml is not null
)
) d;

select
sql_fulltext,
decode('&&profile_name','X0X0X0X0','PROF_&&sql_id'||'_'||plan_hash_value,'&&profile_name')
into
cl_sql_text, l_profile_name
from
v$sqlarea
where
sql_id = '&&new_sql_id';

dbms_sqltune.import_sql_profile(
sql_text => cl_sql_text,
profile => ar_profile_hints,
category => '&&category',
name => l_profile_name,
force_match => &&force_matching
-- replace => true
);

  dbms_output.put_line(' ');
  dbms_output.put_line('SQL Profile '||l_profile_name||' created.');
  dbms_output.put_line(' ');

exception
when NO_DATA_FOUND then
  dbms_output.put_line(' ');
  dbms_output.put_line('ERROR: sql_id: '||'&&sql_id'||' Child: '||'&&child_no'||' not found in v$sql.');
  dbms_output.put_line('ERROR: sql_id: '||'&&new_sql_id'||' not found in v$sqlarea.');
  dbms_output.put_line(' ');

end;
/

undef sql_id
undef new_sql_id
undef child_no
undef profile_name
undef category
undef force_matching

set sqlblanklines off
set feedback on

create_sql_profile

CREATE_SQL_PROFILE_AWR性能

綁定AWR中歷史的計劃中其餘一個ui

----------------------------------------------------------------------------------------
--
-- File name:   create_sql_profile_awr.sql
--
-- Purpose:     Create SQL Profile based on Outline hints in V$SQL.OTHER_XML.
--
-- Author:      Kerry Osborne
--
-- Usage:       This scripts prompts for five values.
--
--              sql_id: the sql_id of the statement to attach the profile to
--              (must be in the shared pool and in AWR history)
--
--              plan_hash_value: the plan_hash_value of the statement in AWR history
--
--              profile_name: the name of the profile to be generated
--
--              category: the name of the category for the profile
--
--              force_macthing: a toggle to turn on or off the force_matching feature
--
-- Description:
--
--              Based on a script by Randolf Giest.
--
-- Mods:        This is the 2nd version of this script which removes dependency on rg_sqlprof2.sql.
--
--              See kerryosborne.oracle-guy.com for additional information.
---------------------------------------------------------------------------------------
--

-- @rg_sqlprof1 '&&sql_id' &&child_no '&&category' '&force_matching'

set feedback off
set sqlblanklines on

accept sql_id -
       prompt 'Enter value for sql_id: ' -
       default 'X0X0X0X0'
accept plan_hash_value -
       prompt 'Enter value for plan_hash_value: '
accept profile_name -
       prompt 'Enter value for profile_name (PROF_sqlid_planhash): ' -
       default 'X0X0X0X0'
accept category -
       prompt 'Enter value for category (DEFAULT): ' -
       default 'DEFAULT'
accept force_matching -
       prompt 'Enter value for force_matching (FALSE): ' -
       default 'false'

declare
ar_profile_hints sys.sqlprof_attr;
cl_sql_text clob;
l_profile_name varchar2(30);
begin
select
extractvalue(value(d), '/hint') as outline_hints
bulk collect
into
ar_profile_hints
from
xmltable('/*/outline_data/hint'
passing (
select
xmltype(other_xml) as xmlval
from
dba_hist_sql_plan
where
sql_id = '&&sql_id'
and plan_hash_value = &&plan_hash_value
and other_xml is not null
)
) d;

select
sql_text,
decode('&&profile_name','X0X0X0X0','PROF_&&sql_id'||'_'||'&&plan_hash_value','&&profile_name')
into
cl_sql_text, l_profile_name
from
dba_hist_sqltext
where
sql_id = '&&sql_id';

dbms_sqltune.import_sql_profile(
sql_text => cl_sql_text,
profile => ar_profile_hints,
category => '&&category',
name => l_profile_name,
force_match => &&force_matching
-- replace => true
);

  dbms_output.put_line(' ');
  dbms_output.put_line('SQL Profile '||l_profile_name||' created.');
  dbms_output.put_line(' ');

exception
when NO_DATA_FOUND then
  dbms_output.put_line(' ');
  dbms_output.put_line('ERROR: sql_id: '||'&&sql_id'||' Plan: '||'&&plan_hash_value'||' not found in AWR.');
  dbms_output.put_line(' ');

end;
/

undef sql_id
undef plan_hash_value
undef profile_name
undef category
undef force_matching

set sqlblanklines off
set feedback on

create_sql_profile_awr

sql_profile_hintsthis

顯示sql profile中的HINT信息spa

----------------------------------------------------------------------------------------
--
-- File name:   profile_hints.sql
--
-- Purpose:     Show hints associated with a SQL Profile.
-
-- Author:      Kerry Osborne
--
-- Usage:       This scripts prompts for one value.
--
--              profile_name: the name of the profile to be modified
--
-- Description: This script pulls the hints associated with a SQL Profile.
--
-- Mods:        Modified to check for 10g or 11g as the hint structure changed.
--              Modified to join on category as well as signature.
--
--              See kerryosborne.oracle-guy.com for additional information.
---------------------------------------------------------------------------------------
--
set sqlblanklines on
set feedback off
accept profile_name -
       prompt 'Enter value for profile_name: ' -
       default 'X0X0X0X0'

declare
ar_profile_hints sys.sqlprof_attr;
cl_sql_text clob;
version varchar2(3);
l_category varchar2(30);
l_force_matching varchar2(3);
b_force_matching boolean;
begin
 select regexp_replace(version,'\..*') into version from v$instance;

if version = '10' then

-- dbms_output.put_line('version: '||version);
   execute immediate -- to avoid 942 error
   'select attr_val as outline_hints '||
   'from dba_sql_profiles p, sqlprof$attr h '||
   'where p.signature = h.signature '||
   'and p.category = h.category  '||
   'and name like (''&&profile_name'') '||
   'order by attr#'
   bulk collect
   into ar_profile_hints;

elsif version = '11' then

-- dbms_output.put_line('version: '||version);
   execute immediate -- to avoid 942 error
   'select hint as outline_hints '||
   'from (select p.name, p.signature, p.category, row_number() '||
   '      over (partition by sd.signature, sd.category order by sd.signature) row_num, '||
   '      extractValue(value(t), ''/hint'') hint '||
   'from sqlobj$data sd, dba_sql_profiles p, '||
   '     table(xmlsequence(extract(xmltype(sd.comp_data), '||
   '                               ''/outline_data/hint''))) t '||
   'where sd.obj_type = 1 '||
   'and p.signature = sd.signature '||
   'and p.category = sd.category '||
   'and p.name like (''&&profile_name'')) '||
   'order by row_num'
   bulk collect
   into ar_profile_hints;

end if;

  dbms_output.put_line(' ');
  dbms_output.put_line('HINT');
  dbms_output.put_line('------------------------------------------------------------------------------------------------------------------------------------------------------');
  for i in 1..ar_profile_hints.count loop
    dbms_output.put_line(ar_profile_hints(i));
  end loop;
  dbms_output.put_line(' ');
  dbms_output.put_line(ar_profile_hints.count||' rows selected.');
  dbms_output.put_line(' ');

end;
/
undef profile_name
set feedback on

sql_profile_hints

1、SQL 綁定現有執行計劃

一個SQL存在多個執行計劃，選擇其中一個固定

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

SQL_ID  4hpk08j31nm7y, child number 0
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 3956160932
 
--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|*  1 |  TABLE ACCESS FULL| EMP  |     6 |   228 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   1 - filter("DEPTNO"=30)
 
SQL_ID  4hpk08j31nm7y, child number 2
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 1404472509
 
------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |     2 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP              |     6 |   228 |     2   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | INDEX_EMP_DEPTNO |     6 |       |     1   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("DEPTNO"=30)

語句綁定第一個子游標爲固定的執行計劃：全表掃描

sys@GULL> @create_sql_profile
Enter value for sql_id: 4hpk08j31nm7y
Enter value for child_no (0): 0
Enter value for new_sql_id: 4hpk08j31nm7y
Enter value for profile_name (PROF_sqlid_planhash): 
Enter value for category (DEFAULT): 
Enter value for force_matching (TRUE): 
原值   19: sql_id = '&&sql_id'
新值   19: sql_id = '4hpk08j31nm7y'
原值   20: and child_number = &&child_no
新值   20: and child_number = 0
原值   27: decode('&&profile_name','X0X0X0X0','PROF_&&sql_id'||'_'||plan_hash_value,'&&profile_name')
新值   27: decode('X0X0X0X0','X0X0X0X0','PROF_4hpk08j31nm7y'||'_'||plan_hash_value,'X0X0X0X0')
原值   33: sql_id = '&&new_sql_id';
新值   33: sql_id = '4hpk08j31nm7y';
原值   38: category => '&&category',
新值   38: category => 'DEFAULT',
原值   40: force_match => &&force_matching
新值   40: force_match => TRUE
原值   51:   dbms_output.put_line('ERROR: sql_id: '||'&&sql_id'||' Child: '||'&&child_no'||' not found in v$sql.');
新值   51:   dbms_output.put_line('ERROR: sql_id: '||'4hpk08j31nm7y'||' Child: '||'0'||' not found in v$sql.');
原值   52:   dbms_output.put_line('ERROR: sql_id: '||'&&new_sql_id'||' not found in v$sqlarea.');
新值   52:   dbms_output.put_line('ERROR: sql_id: '||'4hpk08j31nm7y'||' not found in v$sqlarea.');
SQL Profile PROF_4hpk08j31nm7y_1404472509 created.

執行相同的SQL語句運行

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

SQL_ID  4hpk08j31nm7y, child number 0
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 3956160932
 
--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|*  1 |  TABLE ACCESS FULL| EMP  |     6 |   228 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   1 - filter("DEPTNO"=30)
 
Note
-----
   - SQL profile PROF_4hpk08j31nm7y_1404472509 used for this statement

在Note信息中能夠看到sql profile的信息， - SQL profile PROF_4hpk08j31nm7y_1404472509 used for this statement，說明已經強制使用了手工綁定的執行計劃，以後這個語句就一直採用全表掃描了，不會再走索引的訪問方式

FORCE_MATCH=>TRUE :若是sql語句中既有綁定變量和字面值傳入仍是沒法當作同一條語句處理；只能是所有綁定變量或者是所有字面值傳入

2、SQL綁定AWR中的執行計劃

shared pool中以前沒有合適的執行計劃，你能夠在awr（DBMS_XPLAN.DISPLAY_AWR）中查找歷史的執行計劃，查詢到了，採用create_sql_profile_awr這個過程來綁定

構造一個SQL語句兩個執行計劃，保存到AWR中

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

alter session set optimizer_index_cost_adj=500

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

execute DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

查看AWR中的執行計劃

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

SQL_ID 4hpk08j31nm7y
--------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 1404472509
 
------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |     2 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP              |     6 |   522 |     2   (0)| 00:00:01 |
|   2 |   INDEX RANGE SCAN          | INDEX_EMP_DEPTNO |     6 |       |     1   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------
 
Note
-----
   - dynamic sampling used for this statement (level=2)
 
SQL_ID 4hpk08j31nm7y
--------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 3956160932
 
--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|   1 |  TABLE ACCESS FULL| EMP  |     6 |   522 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------
 
Note
-----
   - dynamic sampling used for this statement (level=2)

使SQL語句固定走索引的處理模式

SQL> set serveroutput on
SQL> @create_sql_profile_awr.sql
Enter value for sql_id: 4hpk08j31nm7y
Enter value for plan_hash_value: 1404472509
Enter value for profile_name (PROF_sqlid_planhash): 
Enter value for category (DEFAULT): 
Enter value for force_matching (FALSE): TRUE
原值   19: sql_id = '&&sql_id'
新值   19: sql_id = '4hpk08j31nm7y'
原值   20: and plan_hash_value = &&plan_hash_value
新值   20: and plan_hash_value = 1404472509
原值   27: decode('&&profile_name','X0X0X0X0','PROF_&&sql_id'||'_'||'&&plan_hash_value','&&profile_name')
新值   27: decode('X0X0X0X0','X0X0X0X0','PROF_4hpk08j31nm7y'||'_'||'1404472509','X0X0X0X0')
原值   33: sql_id = '&&sql_id';
新值   33: sql_id = '4hpk08j31nm7y';
原值   38: category => '&&category',
新值   38: category => 'DEFAULT',
原值   40: force_match => &&force_matching
新值   40: force_match => TRUE
原值   51:   dbms_output.put_line('ERROR: sql_id: '||'&&sql_id'||' Plan: '||'&&plan_hash_value'||' not found in AWR.');
新值   51:   dbms_output.put_line('ERROR: sql_id: '||'4hpk08j31nm7y'||' Plan: '||'1404472509'||' not found in AWR.');
SQL Profile PROF_4hpk08j31nm7y_1404472509 create

從新執行SQL語句並查看執行計劃

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor(null,null))

SQL_ID  4hpk08j31nm7y, child number 0
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 1404472509
 
------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |     2 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP              |     4 |   348 |     2   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | INDEX_EMP_DEPTNO |     2 |       |     1   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("DEPTNO"=30)
 
Note
-----
   - SQL profile PROF_4hpk08j31nm7y_1404472509 used for this statement

note 信息中已經使用了sql profile，並且語句也是走索引

3、SQL綁定構造的執行計劃

shared pool和awr中沒有一個合適的，須要本身構造這個sql語句的執行計劃，進行偷樑換柱

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

SQL_ID  4hpk08j31nm7y, child number 0
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 3956160932
 
--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |       |       |     3 (100)|          |
|*  1 |  TABLE ACCESS FULL| EMP  |     6 |   228 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   1 - filter("DEPTNO"=30)

能夠構造一個走deptno索引的，在走索引的執行計劃去替換全表

select /*+index(emp index_emp_deptno)*/ * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor(null,null))

SQL_ID  2hdyvqk9b09va, child number 0
-------------------------------------
select /*+index(emp index_emp_deptno)*/ * from  scott.emp  where 
deptno=30
 
Plan hash value: 1404472509
 
------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |    10 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP              |     6 |   228 |    10   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | INDEX_EMP_DEPTNO |     6 |       |     5   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("DEPTNO"=30)

可使用SQL_ID 2hdyvqk9b09va, child number 0，來替換以前SQL_ID 4hpk08j31nm7y, child number 0的執行計劃

sys@GULL> @create_sql_profile
Enter value for sql_id: 2hdyvqk9b09va
Enter value for child_no (0): 0
Enter value for new_sql_id: 4hpk08j31nm7y
Enter value for profile_name (PROF_sqlid_planhash): 
Enter value for category (DEFAULT): 
Enter value for force_matching (TRUE): 
原值   19: sql_id = '&&sql_id'
新值   19: sql_id = '2hdyvqk9b09va'
原值   20: and child_number = &&child_no
新值   20: and child_number = 0
原值   27: decode('&&profile_name','X0X0X0X0','PROF_&&sql_id'||'_'||plan_hash_value,'&&profile_name')
新值   27: decode('X0X0X0X0','X0X0X0X0','PROF_2hdyvqk9b09va'||'_'||plan_hash_value,'X0X0X0X0')
原值   33: sql_id = '&&new_sql_id';
新值   33: sql_id = '4hpk08j31nm7y';
原值   38: category => '&&category',
新值   38: category => 'DEFAULT',
原值   40: force_match => &&force_matching
新值   40: force_match => TRUE
原值   51:   dbms_output.put_line('ERROR: sql_id: '||'&&sql_id'||' Child: '||'&&child_no'||' not found in v$sql.');
新值   51:   dbms_output.put_line('ERROR: sql_id: '||'2hdyvqk9b09va'||' Child: '||'0'||' not found in v$sql.');
原值   52:   dbms_output.put_line('ERROR: sql_id: '||'&&new_sql_id'||' not found in v$sqlarea.');
新值   52:   dbms_output.put_line('ERROR: sql_id: '||'4hpk08j31nm7y'||' not found in v$sqlarea.');
SQL Profile PROF_2hdyvqk9b09va_3956160932 created.

再次查看原始語句的執行計劃

select * from  scott.emp  where deptno=30

select * from table(dbms_xplan.display_cursor('4hpk08j31nm7y',null))

SQL_ID  4hpk08j31nm7y, child number 0
-------------------------------------
select * from  scott.emp  where deptno=30
 
Plan hash value: 1404472509
 
------------------------------------------------------------------------------------------------
| Id  | Operation                   | Name             | Rows  | Bytes | Cost (%CPU)| Time     |
------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT            |                  |       |       |    10 (100)|          |
|   1 |  TABLE ACCESS BY INDEX ROWID| EMP              |     6 |   228 |    10   (0)| 00:00:01 |
|*  2 |   INDEX RANGE SCAN          | INDEX_EMP_DEPTNO |     6 |       |     5   (0)| 00:00:01 |
------------------------------------------------------------------------------------------------
 
Predicate Information (identified by operation id):
---------------------------------------------------
 
   2 - access("DEPTNO"=30)
 
Note
-----
   - SQL profile PROF_2hdyvqk9b09va_3956160932 used for this statement

偷樑換柱完成，操做起來也是很方便。

4、查看sql profile hint信息

SQL> @sql_profile_hints.sql
Enter value for profile_name: PROF_4hpk08j31nm7y_1404472509
原值   19:    'and name like (''&&profile_name'') '||
新值   19:    'and name like (''PROF_4hpk08j31nm7y_1404472509'') '||
原值   38:    'and p.name like (''&&profile_name'')) '||
新值   38:    'and p.name like (''PROF_4hpk08j31nm7y_1404472509'')) '||
HINT
--------------------------------------------------------------------------------
----------------------------------------------------------------------
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('11.2.0.3')
DB_VERSION('11.2.0.3')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
INDEX_RS_ASC(@"SEL$1" "EMP"@"SEL$1" ("EMP"."DEPTNO"))
6 rows selected.

下一篇講解一些用coe_xfr_sql_profile腳本去綁定執行計劃