-- Plan from the Shared Pool
select * from table(dbms_xplan.display_cursor('SQL_ID',null,'ALL'));

-- Plan from the AWR
select * from table(dbms_xplan.display_awr('SQL_ID',null,null,'ALL'));
select * from table(dbms_xplan.display_awr('SQL_ID',null,DBID,'ALL'));

-- To get plan for a particular PHV
SELECT * FROM table(DBMS_XPLAN.DISPLAY_AWR('SQLID',PHV));


-- kill all sessions executing a bad SQL
select 
     'alter system kill session '''|| s.SID||',' || s.serial# ||''';' 
    from v$session s
where s.sql_id='&SQL_ID';


-- kill all sessions executing a bad SQL but in a RAC environment 
SELECT 'alter system kill session '''|| SID|| ','|| SERIAL#|| ',@'|| inst_id|| ''' immediate ;'
FROM gv$session
WHERE sql_id = '&sql_id'


-- Kill all sessions waiting for specific events by a specific user
select       'alter system kill session '''|| s.SID||',' || s.serial# ||''';' 
from gv$session s
where 1=1 
and (event='latch: shared pool' or event='library cache lock') and s.USERNAME='DBSNMP';



-- generate commands to kill all sessions from a specific user on specific instance
select 'alter system kill session '''|| SID||',' || serial# ||''' immediate;' from gv$session where username='BAD_USER' and inst_id=1;

-- To enable SQL Tracing
alter system set events 'sql_trace [sql:8krc88r46raff]';




-- Index Rebuild
SELECT 'ALTER INDEX ' || a.index_name || ' REBUILD;'
FROM   all_indexes a
WHERE  index_name  = DECODE(Upper('&1'),'ALL',a.index_name,Upper('&1'))
AND    table_owner = Upper('&2')
ORDER BY 1
/



Enable a job

EXECUTE DBMS_SCHEDULER.ENABLE('SCOTT.MONTHLYBILLING');

Disable a job

EXECUTE DBMS_SCHEDULER.DISABLE('SCOTT.MONTHLYBILLING');

Stop a running job

EXECUTE DBMS_SCHEDULER.STOP_JOB('SCOTT.MONTHLYBILLING');

Drop a running job

EXECUTE DBMS_SCHEDULER.DROP_JOB('SCOTT.MONTHLYBILLING');

Run a job immediately

EXECUTE DBMS_SCHEDULER.RUN_JOB('SCOTT.MONTHLYBILLING');





-- Get current scn value:
select current_scn from v$database;

-- Get scn value at particular time:
select timestamp_to_scn('19-JAN-08:22:00:10') from dual;

-- Get timestamp from scn:
select scn_to_timestamp(224292)from dual;


set line 200 pages 2000
select * from table(dbms_xplan.display_cursor(format=>'ALLSTATS LAST, ADVANCED, +METRICS'));

set line 200 pages 200
select * from table (Dbms_xplan.display_cursor(format=>'allstats last'));


exec DBMS_WORKLOAD_REPOSITORY.ADD_COLORED_SQL(sql_id=>'<sql_id>'); 
This procedure adds a colored SQL ID. If an SQL ID is colored, it will be captured in every snapshot, independent of its level of activities (so that it does not have to be a TOP SQL). 
Capture occurs if the SQL is found in the cursor cache at snapshot time. To uncolor the SQL, invoke the REMOVE_COLORED_SQL Procedure. 



-- Identify and kill sessions
select ‘alter system kill session ‘||’ ‘||””||s.sid||’,’||s.serial# ||”’ immediate;’ FROM v$session s
WHERE s.type!= ‘BACKGROUND’
AND S.TYPE=’USER’
AND S.USERNAME='<SCHEMA NAME>’
AND TRUNC(S.LOGON_TIME) < ’28-JUN-2018′
AND S.STATUS=’INACTIVE’
— and last_call_et > 30 — more than 30 mins inactive