Tuning SQL ID

http://www.runningoracle.com/product_info.php?products_id=435

Summary 
You can create an SQL TUNING TASK manually ad hoc with the following simple steps. 

ALTER SESSION SET NLS_LANGUAGE=’AMERICAN’; 

0. Find the sql_id of the oracle session you would like to analyze. Usually the AWR has the top sql_ids. 
In case this is a current sql running use the v$session. 

select sql_id from v$session where sid = 😡 

1. Login as SYSTEM (or any other user) at sqlplus and create the tuning task:

SET SERVEROUTPUT ON
declare
stmt_task VARCHAR2(40);
begin
stmt_task := DBMS_SQLTUNE.CREATE_TUNING_TASK(sql_id => '5tru8vxmktswq');
DBMS_OUTPUT.put_line('task_id: ' || stmt_task );
end;
/
task_id: TASK_69287

2. Run the SQL TUNING TASK

begin
DBMS_SQLTUNE.EXECUTE_TUNING_TASK(task_name => 'TASK_69287');
end;
/

3. You can monitor the processing of the tuning task with the statement 

SELECT TASK_NAME, STATUS FROM DBA_ADVISOR_LOG WHERE TASK_NAME = ‘TASK_69287’; 

4. When the task has a status=COMPLETED, then run:

SELECT DBMS_SQLTUNE.REPORT_TUNING_TASK('TASK_69287') AS recommendations FROM dual;

5. Examine the recommendations from Oracle, in case you agree, then accept the best SQL profile.

begin
DBMS_SQLTUNE.ACCEPT_SQL_PROFILE(task_name => 'TASK_69287', task_owner => 'SYSTEM', replace => TRUE);
end;
/

6. You can check the database sql profiles with the statement:

select * from dba_sql_profiles;

In case you want to disable an sql profile use the statement:

begin
DBMS_SQLTUNE.ALTER_SQL_PROFILE('SQL_PROFILE','STATUS','DISABLED');
end;
/

https://dbaclass.com/article/how-to-run-sql-tuning-advisor-for-a-sql_id/

declare
l_sql_tune_task_id varchar2(100);
begin
l_sql_tune_task_id := dbms_sqltune.create_tuning_task (
begin_snap => 4883,
end_snap => 4888,
sql_id => ‘1pfbzr2wbnwsy’,
scope => dbms_sqltune.scope_comprehensive,
time_limit => 10800,
task_name => ‘tune_sql_1pfbzr2wbnwsy’,
description => ‘tuning_du_sql_1pfbzr2wbnwsy’);
dbms_output.put_line(‘l_sql_tune_task_id: ‘ || l_sql_tune_task_id);
end;
/

EXEC DBMS_SQLTUNE.execute_tuning_task(task_name => ‘tune_sql_1pfbzr2wbnwsy’);

set long 65536
set longchunksize 65536
set linesize 100
select dbms_sqltune.report_tuning_task(‘tune_sql_1pfbzr2wbnwsy’) from dual;