1.drop tuning task if task exists（删除之前的优化任务，如果存在的话）

sqlplus / as sysdba

exec DBMS_SQLTUNE.DROP_TUNING_TASK('zhangx_tune_taks'); <<ignore error if raise "taks does not exis "

2.create tuning task ,please replace sql_id 8gn0a9gxnc125 with yours.创建一个新的sql优化任务，DECLAREtune_task VARCHAR2(30);BEGINtune_task:=DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_id=>'8gn0a9gxnc125',task_name=>'zhangx_tune_taks',time_limit => 600,description=>'ProvideSQLID');

END;

/

3.exec tuning taskBEGINDBMS_SQLTUNE.EXECUTE_TUNING_TASK( task_name => 'zhangx_tune_taks' );END;

/

4.check tuning findingset lines 999set long 100000set longchunksize 100000select dbms_sqltune.report_tuning_task('zhangxiong_tune_taks') from dual;