Orphan sessions - end of communication channel

Dear Colleagues,
We are facing with a server crash or are forced to shutdown and restart the db server on monthly basis approx. and we believe that this problem is related to orphan sessions created by users connected through application servers (remote desktop connection - RDC) and when our off-site link drops these sessions exists on the db and when the connection re-establishes new connections are formed and this kept on going untill a crash occurs or we are forced to shutdown the db - which also ends in a crash after giving a message 'End of communication channel' - to control the extra sessions from being created we tried setting the retention time of a connection to 5 minutes but this seems to be adding on to the problem as well. Before proceeding any further let me apprise you on our environment:
Windows 2000 Advanced server running on ML-570 dual processor
Oracle 9.0.1.1.1
DB Users: 350-300 approx. concurrent sessions
Front end application s/w are developed in VB 6 and are deployed on "Unisys ES 7000 Orion 230" on 3-4 partitions each of 4-6 processors - These is used as our application servers.
We believe this started roughly after we gave access to our off-site offices because we have 1 GB LAN access at the main site and the users are given thin clients (HP thin clients) and this problem existed nevertheless, restart of db server once in a while - which is something every windows user does and we all know.
Can any body please tell us is this a orphan session problem and its remedy? or its something else - do we need an application server to manage the transactions or any thing which can help in the resolution of the problem.
You help is appreciated as always.
Take care.
QJ

Try tracing the drop user statement. Then you'll see exactly what's happening very near the point where the socket is closed. Repeating the test with varying input parameters--I know there are many of them and that's precisely the point--for a few iterations will produce enough trace data that you'll be better equipped to decide on a reasonable course of action.
alter session set events '10046 trace name context forever, level 12';
drop user hard_to_kill;
The resulting trace data will tell you if you have to go so far as admin level sql net tracing.

Similar Messages

Problem with ORA -03113 End of Communication Channel

Hello,
Oracle Database 10g Release 10.2.0.1.0 - Production
Windows Server 2003 Version V5.2 Service Pack 2
Im having this problem when executing an stored procedure that executes a SQL statement wich has uses db links... I get this end of communication channel error.. so I thought it was a network issue, but all connections are fine.
The thing is that the procedure works fine, but just out of the nothing starts to give that problem, shutting down the database would not correct the problem, only restarting the server will fix the issue temporarily. I checked the dump file related to the process am running and I found this, I think it might be like a memory problem but not sure
Windows thread id: 5632, image: ORACLE.EXE (J002)
*** ACTION NAME:() 2010-09-01 09:18:59.490
*** MODULE NAME:() 2010-09-01 09:18:59.490
*** SERVICE NAME:(SYS$USERS) 2010-09-01 09:18:59.490
*** SESSION ID:(545.34045) 2010-09-01 09:18:59.490
*** 2010-09-01 09:18:59.490
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [ACCESS_VIOLATION] [_kghalf+478] [PC:0x603BEB04] [ADDR:0x61E26AE8] [UNABLE_TO_WRITE] []
No current SQL statement being executed.
what do you recommend me to try here?

Hi Ogan,
I agree ! Of course we are often obliged to compose with minimal downtime, testing resources, editors, management, time etc.
I have the same problems but keeping the base version is a pain and if you consider 10.2.0.5 you won't have to install many patchsets after this one on the 10gR2 homes/databases. It's a "good" investment if you have to keep the 10gR2 for several years (going to 11g is more difficult than installing a patchset !)
Oracle patchsets are great and well tested and if you pay your Oracle license you pay for that ! The patchsets, patchset updates, support make the difference with the versions you can download "freely" on OTN.
Best regards
Phil

End of communication channel error on second execution

a select view over a database link will return results once but on second execution returns end of communication channel error.
i have lots of other views working fine this way. the problem view did work but has started failing. .
running the view on the database which is running the htmldb application in a sqlplus session (which is the same schema which htmldb is using for the application) works fine. it is only htmldb which is showing the problem both from within the application and the sql workshop

Hi,
For a 'serious' error like that you will probably want to work with Oracle support who will be able to work with you to resolve the problem.

End of communication channel error

While working with our application developed in VB, In some times when I use describe command in sql * plus, giving "end of communication channel error" and getting disconnected from the database. Select and other DML commands are working well.
Any suggestions please...
Thanks in advance....
UMAMAHESWARA REDDY

Check the alert log and with your network people for any errors.

End of Communications Channel

Hi,
I face a problem here when I create a database. When I run the scripts to create a database, it gives the message end-of-communication channel. Just bear in mind that there is space in the location for the database. Some details are as follow:
There is a HP server.
The database is created in the nfs which is not the local directory.
Please advice ...
Regards,
- Tassy -

Hi,
I got a problem quite like urs on HP too.
It was cause of the max OS process was reached. U have to modify a kernel variable. Dont remember exactly the name but it's something like nb_proc.
Hope it helps,
Fred

ORA-03113 END OF COMMUNICATION CHANNEL

Iam trying to install 0racle 8.1.7 on an NT server machine with SP6a.During the installation while the database is created I get the following error:
ORA0-03113 end of communication channel.
I have performed the installation (after unistalling, cleaning the registry ) 3 times and even have taken the machine off the network, but the same error occurs.
I have installed 8.1.7 on another machine and never had this problem.
Any ideas what is happenning?
Thanks in advance

ORA-03113: end-of-file on communication channel
I saw this when running the "Database Configuration Assistant" and "sqlplus". When the "Database Configuration Assistant" gave me this error during Oracle 9i (9.2.0) installation on Red Hat 2.1 AS, I simply removed the shared memory segments owned
by the Oracle user and I restarted the "Database Configuration Assistant". I'm not sure if this is the right way but it always worked for me. Here is what I did to get the "Database Configuration Assistant" running again:
I executed the ipcs command to get the address of the shared memory segments that have been allocated by Oracle:
# ipcs
------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 0 root 600 196608 2
0x00000001 32769 root 600 655360 2
0x00000000 458755 oracle 660 4194304 0
0x00000000 491524 oracle 660 33554432 0
0x00000000 524293 oracle 660 33554432 0
0x00000000 557062 oracle 660 33554432 0
0x00000000 589831 oracle 660 33554432 0
0x00000000 622600 oracle 660 33554432 0
0x00000000 655369 oracle 660 33554432 0
0x00000000 688138 oracle 660 33554432 0
0x3ecee0b0 720907 oracle 660 4194304 0
------ Semaphore Arrays --------
key semid owner perms nsems status
------ Message Queues --------
key msqid owner perms used-bytes messages
Then I removed all shared memory segments that were owned by the Oracle user during the installation with the following command:
# ipcrm shm 458755 491524 524293 557062 589831 622600 655369 688138 720907
After that I restarted the "Database Configuration Assistant". Once the installation was done I immediately restarted the DB as well.
Caveat: I'm not sure if this procedure can cause any other problems if it's done during the installation.
But if you get this problem in connection with sqlplus, then simply make sure that the database is down and exit sqlplus. After that, follow the procedure above by removing all shared memory segments that belong to the Oracle user. To my knowledge,
this should not cause any problems.

End-of-communication channel while executing sqlldr from java procedure

Hi all,
I am having 10g 10.1.0.3.1 ( Infrastructure ) on linux, I am executing Sql Loader
( sqlldr ) from client (XP) using java stored procedure. After loading the data I am getting Error - ( end-of-communication channel). But same java procedure is working fine without any error on 10g without (Infrastructure). Is this problem is becuase of infrastructure or some patch has to be installed on the database. For my satisfaction I reinstalled java Virtual Machine on database with the help of
( initjvm.sql ). But problem is still there. Any idea what exactly the problem is.
SKM

This is the most frequently asked question from Oracle developers.. Never mind putting some light on this error, I want to put it alight! ;-)
First thing. It is not The Error. It is a sympton of an error.
This message does not come from the database. It comes from the client OCI (of JDBC) drivers - which suddenly discovered that the Oracle connection (usually a TCP socket connection) has been torn down at the server side. It attempts to write to that socket, only to find that the other party has hung up.
Why has the other party hung up? That party is either a Dedicated Server Process or a Dispatcher Process. If a dedicated server dies (crashes), it will take its socket handles with it to The Great Recycle Bin In The Sky. If you was serviced by a shared server and it died, the Dispatcher (who handles the TCP comms for it), will automatically close that shared server's connection.
Usually when a process dies on the Oracle server, it leaves behind an error in the alert log, and trace files. That is where you will find the inklings of what The Error was that caused your client to get the EOF on comms channel message.

End-of-communication channel error from client

In my server oracle(oracle9i enterprices edition) is working fine but from client side i'm getting the following error
*end-of-communication channel error
But my network is working fine
anyone can you give me the solution for this problem....?
Message was edited by:
user497084

checkout TNSPING <service name> from cmd prompt
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\NJi>tnsping issl
TNS Ping Utility for 32-bit Windows: Version 2.3.2.1.0 - Production on 25-OCT-06
14:36:06
Copyright , 1996(c) Oracle Corporation 1995. All rights reserved.
Attempting to contact (ADDRESS=(COMMUNITY=tcp.world)(PROTOCOL=TCP)(Host=198.1.2.
15)(Port=1521))
OK (100 msec)

End of communication channel when select from view

We are using DB 10.0.2.0.2 and when we run select statement from view it gives End of communication channel error but when we run the query by using the sql in the view it works fine.
Please advise what may be wrong.

Like other poster suggested, please post some sample code, query your used to build the view (you can scramble the real table/column name as your wish) and the actual screen capture of the error.
This will help others to help you. Right now you are only describing symptoms while no one has idea what it really is.

End of communication channel while running proc

Hi ,
As soon as i run a proc i get the following error
BEGIN cdw_load.pa_cdw_gi_extract.pr_cdw_gi_usr_rep_extract('PL'); END;
ERROR at line 1:
ORA-03113: end-of-file on communication channel
Process ID: 31568
Session ID: 963 Serial number: 693
THE OTHER STATEMENTS /PROGRAMS in the same data base run fine.
i checked the oracle directories are present.
Please help
procedure is below
procedure pr_cdw_gi_usr_rep_extract(i_cntry_cd in varchar2)
as
-- Procedure PR_GI_USR_REP_EXTRACT is created to extract data for user rep extract.
-- Modification History - None
-- Additional Procedure included and Purpose
-- PR_LOG_ERROR is added to handle the exceptions.
v_file utl_file.file_type;
v_file_name varchar2 (50);
v_file_rec nvarchar2 (32767);
va_strng nvarchar2 (200);
v_errcode varchar2 (30);
v_errmessage varchar2 (300);
v_cntry_cd codi.dim_mrkt.cntry_cd%type;
v_message hz_metadata.hz_job_log_detail.processor_message%type;
v_job_seq_id pls_integer := 0;
v_slct_cnt pls_integer := 0;
v_mrkt_id number := 0;
v_rec_cnt number := 0;
v_prev_3rd_cmpgn number := 0; -- Limit the search on frp table to a max of 3 campaigns
v_prev_2nd_cmpgn number := 0; -- LObtain the campaign previous campaign
v_cmpgn_perd_id number := 0; -- Obtain the latest available camapign from frp ..
--cursor for extracting the data for usr_rep
-- Note: The search campaigns (3 camapigns) were used in an inlist as partition pruning was not happenning with BETEEEN clause
cursor ext_usr_rep
is
select 1 from dual ;
-- procedure for logging the errors during exception handling
procedure log_error(v_message varchar2)
as
begin
hz_metadata.pa_log_gsl.end_logging ('ABORT');
hz_metadata.pa_log_gsl.log_error (p_entity_value => 'N/A',
p_app_message => v_message,
p_system_message => sqlerrm,
p_reprocess_ind => null,
p_continue_on_error => 'Y'
commit;
dbms_output.put_line ('Usr Rep - Extract not generated');
end log_error;
-- end of the log_error procedure
-------main begin ----------------------------
begin
v_cntry_cd := upper(i_cntry_cd);
v_message := 'Capture the market id';
select distinct mrkt_id
into v_mrkt_id
from codi.dim_mrkt
where cntry_cd = v_cntry_cd;
**v_file_name := 'OMSRPT_'||v_cntry_cd ||'_USR_REP.TXT';**
v_message := 'Logging details in to JOB LOG table';
pa_generic.lcl_init_logging (p_module_nm => 'Extracting data for User representatives',
p_program_nm => 'PR_GI_USR_REP_EXTRACT',
p_entity_nm => v_file_name,
p_job_nm => 'EXTRACT - DATA FOR USER REPRESENTATIVES',
p_job_log_id => pa_generic.g_job_seq_id,
p_cntry_cd => v_cntry_cd
commit;
execute immediate 'alter session set global_names=false';
-- Fetch the start and end camapigns for limiting the search on fact_rep_prfrmnc
select nvl(max(fld_sls_cmpgn_perd_id), 20040301) into v_cmpgn_perd_id from cdw.sum_mrkt_acct_sls where mrkt_id = v_mrkt_id ;
-- Fetch the 3rd previous campaign
v_prev_3rd_cmpgn := pa_generic.fn_get_past_cmpgn(v_mrkt_id,v_cmpgn_perd_id,3) ;
-- Fetch the 2nd previous campaign
v_prev_2nd_cmpgn := pa_generic.fn_get_past_cmpgn(v_mrkt_id,v_cmpgn_perd_id,2) ;
v_message := 'Opening the file';
v_file := utl_file.fopen_nchar ('CDW_GI_EXTRACT_' || v_cntry_cd || '_DIR', v_file_name, 'W', 32000);
--loop and fetch the cursor ext_usr_rep1
v_message := 'Opening Cursor ';
for ext_usr_reprec in ext_usr_rep
loop
va_strng := ext_usr_reprec.cur_fet;
utl_file.put_line_nchar (v_file, va_strng);
v_slct_cnt := v_slct_cnt + 1;
end loop;
v_message := 'Closing the file ';
utl_file.fclose (v_file);
v_message := 'Log the successful completion message';
hz_metadata.pa_log_gsl.end_logging ('SUCCESS');
v_message := 'Update the stats';
hz_metadata.pa_log_gsl.log_count (p_app_message => 'DATABASE OPERATION STATISTICS',
p_insert_count => 0,
p_update_count => 0,
p_select_count => v_slct_cnt,
p_error_count => 0
exception
when utl_file.invalid_path
then
log_error (v_message || ' due to invalid path');
raise;
when utl_file.invalid_mode
then
log_error (v_message || ' due to invalid mode');
raise;
when utl_file.invalid_operation
then
log_error (v_message || ' due to invalid operation');
raise;
when utl_file.write_error
then
log_error (v_message || ' due to write error');
raise;
when utl_file.internal_error
then
log_error (v_message || ' due to internal error');
raise;
when utl_file.invalid_filehandle
then
log_error (v_message || ' due to invalid file');
raise;
when no_data_found
then
log_error (v_message || ' due to no data');
raise;
when too_many_rows
then
log_error (v_message || ' due to more rows');
raise;
when others
then
log_error (v_message);
raise;
end pr_cdw_gi_usr_rep_extract;

ORA-3113 may be caused also (or should I say mostly ?) by Oracle bugs: you need to check your database instance alert log for ORA-07445 or ORA-00600 error message and for related trace file:
oerr ora 3113
03113, 00000, "end-of-file on communication channel"
// *Cause: The connection between Client and Server process was broken.
// *Action: There was a communication error that requires further investigation.
//          First, check for network problems and review the SQL*Net setup.
//          Also, look in the alert.log file for any errors. Finally, test to
//          see whether the server process is dead and whether a trace file
//          was generated at failure time.

Drop user - end of communication channel

I have exactly the same problem and it's driving me nuts. The patchset installation to 9.2.0.1 to 9.2.0.2 seems to have caused this.
SQL> drop user dwdemo;
ERROR:
ORA-03113: end-of-file on communication channel
trace file indicates
lost of PARSING IN CURSOR #
THEN
ksedmp: internal or fatal error
ORA-00600: internal error code, arguments: [qmxiUnpPacked2], [121], [], [], [], [], [], []
Current SQL statement for this session:
drop user dwdemo
This also happens when I reconcile a java class object
Can anyone help ?
thanks
stuart

Hi,
Would you please let us know if you found a solution for this problem. We seem to have exactly the same problem.
regards
Ram

End of communication channel on creating Materialized view

Dear All,
I've Oracle Enterprise Edition(ver 9.0.1.1.1) running on Windows Xp Home Edition, When I run the following statement to create a materialized view I got the famous error ORA-03113: end-of-file on communication channel.And the strange thing is that after this I got disconnected from the database and when I tried to reconnect it showed an Error "Shared memory not available". I was forced to restart my database.
CREATE MATERIALIZED VIEW CUVF_MVIEW
TABLESPACE USERS
NOCACHE
NOPARALLEL
BUILD IMMEDIATE
REFRESH COMPLETE
ON DEMAND
START WITH
TO_DATE('08-DEC-2003 11:00:00','dd-mon-yyyy hh24:mi:ss')
NEXT trunc(sysdate) +13/24
WITH ROWID
USING DEFAULT LOCAL ROLLBACK SEGMENT
DISABLE QUERY REWRITE AS
SELECT *
FROM mySchema.Trasaction_FACT@test_link cuvf
WHERE
REFERENCE_DT BETWEEN TRUNC(ADD_MONTHS(SYSDATE,-1),'MON')
AND LAST_DAY(TRUNC(ADD_MONTHS(SYSDATE,-1),'MON'))

Like other poster suggested, please post some sample code, query your used to build the view (you can scramble the real table/column name as your wish) and the actual screen capture of the error.
This will help others to help you. Right now you are only describing symptoms while no one has idea what it really is.

Reg- End of communication channel

Dears,
I have a remote database which is located in other region, But i can ping the database at client place and Even i can able to connect with Sqlplus..and i can able to create user.
But.
If i check the userlist from dba_users it will wait and it throw error end of file communication channel how do i rectify it?

No version number.
No DDL.
No error message.
No information as to how you are connecting to the remote db.
I guess your car won't start because you forgot to turn the key.
If you want help post information that someone can use to help you.

End of communication channel problem

I have a pl/sql block which works in oracle version 9.2.0.1.0 but the same code is not working in Oracle version 9.2.0.4.0. When i execute the PL/SQL block, I the the following error and gets disconnected from the server.
" DECLARE
ERROR at line 1:
ORA-03113: end-of-file on communication channel".
Does anyone have a solution for this.
Thanks in advance.
My Pl/sql block is as follows
DECLARE
XML VARCHAR2(4000);
doc dbms_xmldom.DOMDocument;
v_nl dbms_xmldom.DOMNodeList;
begin
XML := '<TABLES>';
XML := XML || '<TABLE><tag1>#222-22</tag1>';
XML := XML || '</TABLE>';
XML := XML || '</TABLES>';
doc := dbms_xmldom.newDOMDocument(XML);
v_nl := dbms_xslprocessor.selectNodes(dbms_xmldom.makeNode(doc),'/TABLES/TABLE');
dbms_xmldom.freeDocument(doc);
END;

C:\oracle\ORCL9204\rdbms\admin>sqlplus "sys/oracle as sysdba"
SQL*Plus: Release 9.2.0.4.0 - Production on Wed Nov 5 05:53:36 2003
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
SQL> SELECT comp_name, status, substr(version,1,10) as version from dba_registry;
COMP_NAME
STATUS VERSION
Oracle9i Catalog Views
VALID 9.2.0.4.0
Oracle9i Packages and Types
VALID 9.2.0.4.0
Oracle Workspace Manager
VALID 9.2.0.1.0
COMP_NAME
STATUS VERSION
JServer JAVA Virtual Machine
VALID 9.2.0.4.0
Oracle XDK for Java
VALID 9.2.0.6.0
Oracle9i Java Packages
VALID 9.2.0.4.0
COMP_NAME
STATUS VERSION
Oracle interMedia
VALID 9.2.0.4.0
Spatial
VALID 9.2.0.4.0
Oracle Text
VALID 9.2.0.4.0
COMP_NAME
STATUS VERSION
Oracle XML Database
VALID 9.2.0.4.0
Oracle Ultra Search
INVALID 9.2.0.4.0
Oracle Data Mining
VALID 9.2.0.4.0
COMP_NAME
STATUS VERSION
OLAP Analytic Workspace
UPGRADED 9.2.0.4.0
Oracle OLAP API
UPGRADED 9.2.0.4.0
OLAP Catalog
VALID 9.2.0.4.0
15 rows selected.

END OF COMMUNICATION CHANNEL-ORACLE 8.1.7

Hello ORA Friends!
I am using oracle8.1.6 on Windows2000 Server with service pack
2.0 The database was working fine for around One year. But now I
am getting "ORA-03113:End of file Communication" whenever I try
to login.
Even database is not allowing login as "connect / as sysdba" .
If any friend find any solution please send me on
[email protected] as soon as possible.

You may want to check number of process in the init.ora file.
It should be set to 200 atleast. This could cause it, but there
could be some other reason.
mb

Orphan sessions - end of communication channel

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