RE: 9i shared servers (dispatcher) hung

["Yasin Baskan" <yasbs@xxxxxxxxxxxxxx>]

We had a case like this. After enabling the shared server, sessions
begin to wait on themselves. dba_waiters shows that the waiting and the
holding session id's are the same. We have an open tar for this, but
they are requesting traces consistently, we are not able to enable the
shared server on this live system because of the problem and we cannot
reproduce the case on test systems so we are not able to update the tar.
No solution so far.

________________________________

From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Gogala, Mladen
Sent: Wednesday, August 31, 2005 9:21 PM
To: 'JBECKSTROM@xxxxxxxxx'; oracle-l@xxxxxxxxxxxxx;
oracle-db-l@xxxxxxxxxxxxxxxxxxxx; ORACLE-L@xxxxxxxxxxxxx;
oracledba@xxxxxxxxxxx; oracle-rdbms@xxxxxxxxxxxxxxx
Subject: RE: 9i shared servers (dispatcher) hung



Internal deadlock, possibly? Sounds like a situation for hanganalyze
utility. There is a little article mentioning

hanganalyze at http://www.mgogala.com



--

Mladen Gogala

Ext. 121

________________________________

From: Jeffrey Beckstrom [mailto:JBECKSTROM@xxxxxxxxx]
Sent: Wednesday, August 31, 2005 1:44 PM
To: oracle-l@xxxxxxxxxxxxx; oracle-db-l@xxxxxxxxxxxxxxxxxxxx;
ORACLE-L@xxxxxxxxxxxxx; oracledba@xxxxxxxxxxx;
oracle-rdbms@xxxxxxxxxxxxxxx
Subject: 9i shared servers (dispatcher) hung



People could not connect via shared server - hung. So tried stopping the
dispatchers and restarting them. I did:
alter system shutdown immediate 'D000' ;
alter system shutdown immediate 'D001' ;


In alert log I see the following.
idle dispatcher 'D000' terminated, pid = (13, 1)


I do not see d001 stopping. If do a lsnrctl services it still shows
d001.

If do:
ALTER SYSTEM SET DISPATCHERS=''(address=(host=10.20.7.11)(proto
=tcp))(dispatchers=2)'';


Then lsnrctl services shows d000, d001 and d002.

I ended up bouncing the database.  I had to do a shutdown abort since
shutdown immediate hung - probably due to dispatcher d001 getting stuck.
Any ideas on why a dispatcher would get stuck?







Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113





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