Automatic SQL Tuning 学习

Automatic SQL Tuning 学习
1.如果是非dba用户，要赋予advisor权限
2.创建tuning任务
    使用在awr报表中发现有问题的sql进行tuning,还可以直接使用sql_id，cache cursor，sqlset（sql集）等方法
        创建该tuning任务
        SET SERVEROUTPUT ON

        -- Tuning task created for specific a statement from the AWR.
        DECLARE
          l_sql_tune_task_id  VARCHAR2(100);
        BEGIN
          l_sql_tune_task_id := DBMS_SQLTUNE.create_tuning_task (
                                  begin_snap  => 369,
                                  end_snap    => 370,
                                  sql_id      => '3a13916h8yz59',
                                  scope       => DBMS_SQLTUNE.scope_comprehensive,
                                  time_limit  => 60,
                                  task_name   => '3a13916h8yz59_AWR_tuning_task',
                                  description => 'Tuning task for statement 3a13916h8yz59 in AWR.');
          DBMS_OUTPUT.put_line('l_sql_tune_task_id: ' || l_sql_tune_task_id);
        END;
        /
3.执行tuning任务
        EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => '3a13916h8yz59_AWR_tuning_task');
4.查看tuning任务的执行情况
        select * from dba_advisor_log
        如果发现该任务状态是COMPLETED的时候，表示tuning已经完成了
5.查看tuning的结果
    select dbms_sqltune.report_tuning_task('3a13916h8yz59_AWR_tuning_task') from dual