How to use STA（sql tuning advisor）

一、手工生成Sql tuning advisor 

1、SQL text format:

DECLARE

  my_task_name VARCHAR2(30);

  my_sqltext   CLOB;

BEGIN

  my_sqltext := 'SELECT * FROM DBA_SEGMENTS WHERE OWNER=''CLIC'' AND SEGMENT_TYPE=''TABLE''';

  my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_text    => my_sqltext,

                                                  scope       => 'COMPREHENSIVE',

                                                  time_limit  => 60,

                                                  task_name   => 'test_sql_tuning_task1',

                                                  description => 'Task to tune a query');

  DBMS_SQLTUNE.EXECUTE_TUNING_TASK(task_name => 'test_sql_tuning_task1');

END;

/





2、SQL id format：

DECLARE

  my_task_name VARCHAR2(30);

  my_sqltext   CLOB;

BEGIN

  my_task_name := DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_id => 'b3uaak09jfaxc',

                                                  scope       => 'COMPREHENSIVE',

                                                  time_limit  => 60,

                                                  task_name   => 'test_sql_tuning_task1',

                                                  description => 'Task to tune a query');

  DBMS_SQLTUNE.EXECUTE_TUNING_TASK(task_name => 'test_sql_tuning_task1');

END;

/





二、查看生成的STAreport：





set long 999999

set LONGCHUNKSIZE 999999

set serveroutput on size 999999

set linesize 200

select dbms_sqltune.report_tuning_task('test_sql_tuning_task1') from dual;





exec dbms_sqltune.drop_tuning_task('test_sql_tuning_task1');





删除优化任务

SQL> execdbms_sqltune.drop_tuning_task(task_name => 'li_sql_1');





三、accept sql profile

接受建议的 SQL 概要文件,即创建SQL_Profle

SQL> execute dbms_sqltune.accept_sql_profile(task_name => 'test_sql_tuning_task1',task_owner =>'SYS', replace => TRUE);

 

查看创建起来的SQL_Profile信息

SQL>select a.name,a.task_id,a.createdfrom dba_sql_profiles a,dba_advisor_log bwhere a.task_id=b.task_idand b.task_name='test_sql_tuning_task1';





删除SQL_Profile

SQL>exec dbms_sqltune.drop_sql_profile(name =>'SYS_SQLPROF_01411bdf99410002');