Comments on: Updated Session Wait script

By: Coskan

Coskan — Fri, 13 Mar 2009 18:51:39 +0000

Thank you very much for the info. Cant generate the same situation it was a benchmark test session on windows but np.

Thank you for the information

By: Tanel Poder

Tanel Poder — Wed, 11 Mar 2009 16:53:53 +0000

this would show if any sessions are sharing the same process, thus some session switching must happen

Tanel

By: Tanel Poder

Tanel Poder — Wed, 11 Mar 2009 16:53:27 +0000

Session switching can mess up the wait/active state.

Are you using autotrace or Oracle portal or any other session switching client by any chance?

If you’re on dedicated server you can run this:

select sid,paddr,username from v$session
where paddr in (select paddr from v$session group by paddr having count(*)>1)
/

By: Coskan

Coskan — Wed, 11 Mar 2009 15:35:06 +0000

More interesting is session looks like its on the event SQL*Net message from client

15:34:04 SQL> select event,state from v$session_wait where sid=2598;

EVENT STATE
—————————————————————- ——————-
SQL*Net message from client WAITED SHORT TIME

15:34:19 SQL> @usid 2598

USERNAME SID AUDSID OSUSER MACHINE PROGRAM SPID HASH_VALUE LASTCALL STATUS
———————– ————– ———– —————- —————— ——————– ——– ———– ———- ——–
XXXXXXXXXXX ‘2598,1031′ 263152 UK\p94040 \XXXXXXXXXXXXXXX sqlplus.exe 2008 0 426786 INACTIVE

15:34:20 SQL> @sw 2598

SID STATE EVENT SEQ# SEC_IN_STATE P1 P2 P3 P1TRANSL
——- ——- —————————————- ———- ———— ———- ———- ———- —————————————–
2598 WORKING On CPU / runqueue 650 426789 1413697536 1 0

By: Coskan

Coskan — Wed, 11 Mar 2009 15:31:42 +0000

Tanel,

Is it possible that I see a session Inactive but see the same session WORKING On CPU / runqueue

I got confused a bit. If your script says it is working I think it should be active but it is not ???

15:30:41 SQL> @sw 2598

SID STATE EVENT SEQ# SEC_IN_STATE P1 P2 P3 P1TRANSL
——- ——- —————————————- ———- ———— ———- ———- ———- —————————————–
2598 WORKING On CPU / runqueue 650 426567 1413697536 1 0

15:30:42 SQL> @usid 2598

USERNAME SID AUDSID OSUSER MACHINE PROGRAM SPID HASH_VALUE LASTCALL STATUS
———————– ————– ———– —————- —————— ——————– ——– ———– ———- ——–
XXXXXX ‘2598,1031′ 263152 UK\XXXX \XXXXXXXXXXXX sqlplus.exe 2008 0 426569 INACTIVE