执行计划绑定

语法：
SQL text format:

DBMS_SQLTUNE.CREATE_TUNING_TASK(
  sql_text         IN CLOB,
  bind_list        IN sql_binds := NULL,
  user_name        IN VARCHAR2  := NULL,
  scope            IN VARCHAR2  := SCOPE_COMPREHENSIVE,
  time_limit       IN NUMBER    := TIME_LIMIT_DEFAULT,
  task_name        IN VARCHAR2  := NULL,
  description      IN VARCHAR2  := NULL)
RETURN VARCHAR2;  

SQL ID format:

DBMS_SQLTUNE.CREATE_TUNING_TASK(
  sql_id           IN VARCHAR2,
  plan_hash_value  IN NUMBER    := NULL,
  scope            IN VARCHAR2  := SCOPE_COMPREHENSIVE,
  time_limit       IN NUMBER    := TIME_LIMIT_DEFAULT,
  task_name        IN VARCHAR2  := NULL,
  description      IN VARCHAR2  := NULL)
RETURN VARCHAR2;

Workload Repository format:

DBMS_SQLTUNE.CREATE_TUNING_TASK(
  begin_snap       IN NUMBER,
  end_snap         IN NUMBER,
  sql_id           IN VARCHAR2,
  plan_hash_value  IN NUMBER    := NULL,
  scope            IN VARCHAR2  := SCOPE_COMPREHENSIVE,
  time_limit       IN NUMBER    := TIME_LIMIT_DEFAULT,
  task_name        IN VARCHAR2  := NULL,
  description      IN VARCHAR2  := NULL)
RETURN VARCHAR2;

实验1：sql_id format
1. sys用户创建oracle优化任务(v_sqlid,task_name根据实际情况改变)
 set long 10000000 longchunksize 1000000 linesize 150 pagesize 0 serveroutput on size 1000000   verify off
 declare
  my_task_name varchar2(30);
  v_sqlid      varchar2(50);
 begin
  v_sqlid:='11wrxmug9y4a7';
  my_task_name := dbms_sqltune.create_tuning_task
                  (sql_id=> v_sqlid,
                   scope => 'comprehensive',
                   time_limit=>160,
                   task_name=>'task_00000',
                   description => 'tuning task');
  dbms_sqltune.execute_tuning_task('task_00000');              
  end;
 /
 
注：dbms_sqltune.execute_tuning_task('task_00000')，是执行优化任务
 
2. 打印优化任务，里面有一些具体的改进措施
 select dbms_sqltune.report_tuning_task('task_00000') from dual;
 
3.根据优化建议，绑定profile，理论上可提高语句执行效率 
execute dbms_sqltune.accept_sql_profile(task_name => 'task_00000',task_owner => 'sys', replace => true); 

实验2：sql_text format
SQL> alter session set statistics_level=all;

Session altered.

SQL> set serveroutput off
SQL> select * from scott.emp where ename='SCOTT' and DEPTNO=20;

     EMPNO ENAME      JOB              MGR HIREDATE                   SAL       COMM     DEPTNO
---------- ---------- --------- ---------- ------------------- ---------- ---------- ----------
      7788 SCOTT      ANALYST         7566 1987-04-19 00:00:00       3000                    20

SQL> SELECT * FROM table(dbms_xplan.display_cursor(NULL,NULL,'runstats_last'));

PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
SQL_ID  4dsqbp572auuu, child number 0
-------------------------------------
select * from scott.emp where ename='SCOTT' and DEPTNO=20

Plan hash value: 3956160932

------------------------------------------------------------------------------------
| Id  | Operation         | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |      1 |        |      1 |00:00:00.01 |       7 |
|*  1 |  TABLE ACCESS FULL| EMP  |      1 |      1 |      1 |00:00:00.01 |       7 |

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

   1 - filter(("ENAME"='SCOTT' AND "DEPTNO"=20))


18 rows selected.

SQL> DECLARE
 my_task_name VARCHAR2(30);
 my_sqltext   CLOB;
BEGIN
 my_sqltext := 'select * from scott.emp where ename= :name and DEPTNO= :deptno';
 my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK(
         sql_text    => my_sqltext,
bind_list   => sql_binds(anydata.convertvarchar2(10),anydata.convertnumber(2)),
         user_name   => 'SYS',
         scope       => 'COMPREHENSIVE',
         time_limit  => 60,
         task_name   => 'test_sql_tuning',
         description => 'Task to tune a query on emp');
END;
/

PL/SQL procedure successfully completed.

参数说明：
bind_list：多个绑定变量以','逗号分隔。参数值一定要根据绑定变量对应的列的类型书写.如：emp.ename类型是VARCHAR2(10)，那么就要写成 bind_list =>sql_binds(anydata.convertvarchar2(10)),
time_limit：执行的最长时间，默认是60。
scope：LIMITED，用大概1秒时间去优化SQL语句，但是并不进行SQL Profiling分析;COMPREHENSIVE，进行全面分析，包含SQL Profiling分析；比LIMITED用时更长。

--查看任务名 
SQL> select task_name from dba_advisor_log where task_name='test_sql_tuning';

TASK_NAME
------------------------------
test_sql_tuning

--执行sql tuning任务
SQL> exec DBMS_SQLTUNE.EXECUTE_TUNING_TASK( task_name => 'test_sql_tuning' );

PL/SQL procedure successfully completed.

--查看sql tunning任务状态
SQL> select task_name,status from dba_advisor_log where task_name='test_sql_tuning';

TASK_NAME                      STATUS
------------------------------ -----------
test_sql_tuning                COMPLETED

----展示sql tunning结果
set long 10000
set longchunksize 1000
set linesize 100
select dbms_sqltune.report_tuning_task('test_sql_tuning') from dual;

...........省略

--根据建议accept_sql_profile
execute dbms_sqltune.accept_sql_profile(.....)

--完成后删除sql tunning任务
exec dbms_sqltune.drop_tuning_task('test_sql_tuning');

--查看SQL Tuning Advisor的进展（task执行很久）
set lines 200
col opname for a20
col ADVISOR_NAME for a20
select sid,serial#,username,opname,advisor_name,target_desc,start_time sofar,totalwork from v$advisor_progress where username = 'SYS';