固定（稳定）执行计划

你的应用的功能时快时慢，变化比较大，功能的性能能够保持一种稳定的状态，ORACLE 固定执行计划，采用以下这几种方式

  • oracle 9i使用 Outline
  • oracle 10g采用 sql profile
  • oracle 11g增加了sql plan manage

oracle 10g采用 sql profile ：两种模式

  • 从SQL语句历史的执行计划，找到一个合理的，进行绑定
  • 还有一种无法从历史的执行计划找到合理的，只能手工构造进行绑定

提供脚本

create_sql_profile

提供绑定shared pool中已有的执行计划中，找一个绑定或自己构造一个绑定

----------------------------------------------------------------------------------------

--

-- 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:需要绑定的SQL语句

--

--              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

绑定AWR中历史的计划中其他一个

----------------------------------------------------------------------------------------

--

-- 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_hints

显示sql profile中的HINT信息

----------------------------------------------------------------------------------------

--

-- 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

一、SQL 绑定现有执行计划

一个SQL存在多个执行计划，选择其中一个固定

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)

语句绑定第一个子游标为固定的执行计划：全表扫描

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.

执行相同的SQL语句运行

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信息中可以看到sql profile的信息， - SQL profile PROF_4hpk08j31nm7y_1404472509 used for this statement，说明已经强制使用了手工绑定的执行计划，之后这个语句就一直采用全表扫描了，不会再走索引的访问方式

FORCE_MATCH=>TRUE :如果sql语句中既有绑定变量和字面值传入还是无法当做同一条语句处理；只能是全部绑定变量或者是全部字面值传入

二、SQL绑定AWR中的执行计划

shared pool中之前没有合适的执行计划，你可以在awr（DBMS_XPLAN.DISPLAY_AWR）中查找历史的执行计划，查询到了，采用create_sql_profile_awr这个过程来绑定

构造一个SQL语句两个执行计划，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中的执行计划

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语句固定走索引的处理模式

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

重新执行SQL语句并查看执行计划

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 信息中已经使用了sql profile，而且语句也是走索引

三、SQL绑定构造的执行计划

shared pool和awr中没有一个合适的，需要自己构造这个sql语句的执行计划，进行偷梁换柱

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)

可以构造一个走deptno索引的，在走索引的执行计划去替换全表

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)

可以使用SQL_ID 2hdyvqk9b09va, child number 0，来替换之前SQL_ID 4hpk08j31nm7y, child number 0的执行计划

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.

再次查看原始语句的执行计划

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

偷梁换柱完成，操作起来也是很方便。

四、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.

下一篇讲解一些用coe_xfr_sql_profile脚本去绑定执行计划

固定执行计划-SQL PROFILE手工绑定的更多相关文章

  1. Oracle 固定执行计划-使用SPM（Sql Plan Management）固定执行计划

    固定执行计划-使用SPM(Sql Plan Management)固定执行计划 转载自:http://www.lunar2013.com/2016/01/固定执行计划-使用spm%EF%BC%88sq ...

  2. SQL Server如何固定执行计划

    SQL Server 其实从SQL Server 2005开始,也提供了类似ORACLE中固定执行计划的功能,只是好像很少人使用这个功能.当然在SQL Server中不叫"固定执行计划&qu ...

  3. 固定执行计划-使用coe_xfr_sql_profile

    一.历史执行计划固定 历史的执行计划找到一个合理的执行计划进行绑定 1. 存在多个执行计划的语句,按照索引是比较合适的,FULL SCAN不合适 select * from scott.emp whe ...

  4. Oracle - SPM固定执行计划(一)

    一.前言 生产中偶尔会碰到一些sql,有多种执行计划,其中部分情况是统计信息过旧造成的,重新收集下统计信息就行了.但是有些时候重新收集统计信息也解决不了问题,而开发又在嗷嗷叫,没时间让你去慢慢分析原因 ...

  5. Oracle - SPM固定执行计划

    1. 通过dbms_xplan.display_cursor查看指定sql都有哪些执行计划 SQL> select * from table(dbms_xplan.display_cursor( ...

  6. .Oracle固定执行计划之SQL PROFILE概要文件

    1.  引子Oracle系统为了合理分配和使用系统的资源提出了概要文件的概念.所谓概要文件,就是一份描述如何使用系统的资源(主要是CPU资源)的配置文件.将概要文件赋予某个数据库用户,在用户连接并访问 ...

  7. Mysql学习---视图/触发器/存储过程/函数/执行计划/sql优化 180101

    视图 视图: 视图是一个虚拟表(非真实存在),动态获取数据,仅仅能做查询操作 本质:[根据SQL语句获取动态的数据集,并为其命名],用户使用时只需使用[名称]即可获取结果集,并可以将其当作表来使用.由 ...

  8. Oracle - SPM固定执行计划(二)

    一.前言 前面文章(https://www.cnblogs.com/ddzj01/p/11365541.html)给大家介绍了当一条sql有多个执行计划时,如何通过spm去绑定其中一条执行计划.本文将 ...

  9. 执行计划sql

    我准备开始分析并优化我的查询.在分析之前,我想到了一些问题. MS-SQL Server什么时候使用"Table Scan"? MS-SQL Server什么时候使用"I ...

随机推荐

  1. 一个Python项目的创建架构

    要进行Python项目的编写,很多人刚开始一筹莫展,不知道该如何去构建一个项目,现在粗略的描述一下一个项目的创建过程,供大家参考了解一下: 大家可以先忽略其中创建的函数 ,每个包的含义都有定义,大家可 ...

  2. 24.qint64转QString 以及获取文件属性

    qint64转QString qint64 size = info.size(); //qint64 转QString QString size2 = tr("%1").arg(s ...

  3. htmlunit 简单操作

    首先我们新建一个Maven普通客户端项目,然后打开pom.xml 引入htmlunit支持: <dependency> <groupId>net.sourceforge.htm ...

  4. Struts2简单环境搭建

    一.开篇 Struts2是一个运行于web容器的表示层框架,其核心作用是帮助我们处理Http请求.Struts2处理Http请求(Request),并进行内部处理,再进行Http返回. 下载strut ...

  5. Core Java(五)

    类和对象&方法 ——类的定义 现实世界的事物 属性:人的身高,体重等 行为:人可以学习,吃饭等 Java中用class描述事物也是如此 成员变量:就是事物的属性 成员方法:就是事物的行为    ...

  6. 五年磨一剑：Java 开源博客 Solo 1.0.0 发布了！

    从 Solo 第一个版本发布至今,已经过去 5 年了.今天我们非常自豪地宣布,Solo 1.0.0 正式发布,感谢一直以来关注 B3log 开源的朋友! 目前 B3log 开源有三款产品: GitHu ...

  7. BAT三家互联网公司哪家更注重用户体验？

    这几天百度的用户体验又成了设计圈关注的对象,李彦宏好不容易刷出来的好感度一下子被打入了冰点,通过此次事件,不难看出现在的互联网用户对于产品的体验要求越来越高,作为一名美图秀秀级别选手,很难领悟“好设计 ...

  8. Pyhton学习——Day26

    #多态:多态指的是一类事物有多种形态# import abc# class Animal(metaclass = abc.ABCMeta):# 同一类事物:动物# @abc.abstractclass ...

  9. 转：用java调用oracle存储过程总结（比较好理解）

    这段时间开始学习写存储过程,主要原因还是因为工作需要吧,本来以为很简单的,但几经挫折,豪气消磨殆尽,但总算搞通了,为了避免后来者少走弯路,特记述与此,同时亦对自己进行鼓励. 一:无返回值的存储过程 存 ...

  10. pyqt5的QWebEngineView 使用方法

    说明1:关于QWebEngineView pyqt5 已经抛弃 QtWebKit和QtWebKitWidgets,而使用最新的QtWebEngineWidgets. QtWebEngineWidget ...