Query running slow in one node

Question

Hi All,
We are running 4-node Oracle 10g RAC (linux 64-bit). The query is running fast in one node, but the same query is running very slow in the other node. And sometimes, we see pin S wait on X wait event in top 5 events.
Has anyone faced this kind of situation before ?
Thanks,
Kumar

Answer 1

Hi,
Execute your query on node where query is running very slow. Get SID and execute query above to see what is event of waiting.
exec dbms_application_info.set_client_info('@sw2')
-- file sw2.sql
col event  format     a25  heading "Wait Event" trunc
col state  format     a15  heading "Wait State" trunc
col siw    format   99999  heading "Waited So|Far (ms)"
col wt     format 9999999  heading "Time Waited|(ms)"
select event,
       state,
       seconds_in_wait siw,
       wait_time wt
from   v$session_wait
where  sid = &sid
order by event;
exec dbms_application_info.set_client_info('@sw1');
-- file  sw1.sql
set linesize 30000
set pagesize 200
col sid      format    9999  heading "SID"
col username format     a10  heading "USERNAME"
col osuser   format     a20  heading "OSUSER"
col event    format     a25  heading "Wait Event" trunc
col state    format     a15  heading "Wait State" trunc
col siw      format   99999  heading "Waited So|Far (ms)"
col wt       format 9999999  heading "Time Waited|(ms)"
col sw1      format 9999999  heading "File"
col sw2      format 9999999  heading "Block"
col Objeto   format a50
select sw.event,
       sw.p1,
       sw.p2,
       sw.p3,
       sw.state,
       s.sid,
       S.osuser,
       s.username,
       nvl(s.program, s.module),
       sw.seconds_in_wait siw,
       sw.wait_time wt
  from gv$session_wait sw,
       gv$session s
WHERE sw.sid = s.sid
   and sw.EVENT NOT LIKE 'SQL%'
   and username is not NULL
   and s.inst_id = sw.inst_id
   and sw.event not like 'PX%'
order by 1, 6, 7;Regards,
Levi Pereira