Disconnection leaves inactive sessions
Hi I am new to this forum, I have looked but cannot find any reference to my problem, apologies if it has been discussed earlier.
When in SQLDev (EA2 and also earlier versions) on windows2000prof v5 sp4, when I disconnect from a connection inactive sessions are still on the DB (9i r2), this for reasons I won't go into here causes us problems. We have to save all our work and exit sqldev then restart to ensure connections disappear.
I assume this is so connections are reused if you reconnect, and on the face of it seems reasonable, however, it is a problem for us.
Is there some config I can do to stop this behaviour either by connection or for all connections ?
Help appreciated.
btw really like this product, EA2 now has support for AQ's and Materialised views which we use ( we have now decided not to renew TOAD licences because sqldev seems to be mature enough for our purposes now - and is cheaper :-) )
Message was edited by:
CharlieColson
Many thanks for your reply.
I am not doing anything special, it must be designed behaviour because as soon as I exit sqldev the sessions are gone :-
open a connection
run some sql in a worksheet, close worksheet
disconnect from the connection using the connection tree
inactive sessions remain on the database, one for connection and one for insight.
I was hoping that there is some java/config/connection setting I could use, it dosen't happen from TOAD so I can't think it is server behaviour ( and neither does my DBA ).
Cheers
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Is there a way of dealing with users leaving inactive sessions?
We have a problem at the moment with users not logging off shared laptops, with then results in sometimes 2-3 people all logged on to the same laptop at once causing performance issues, we are trying to find a reliable solution to this, such as logging off
inactive users say after 30 minutes without affecting the user that is currently logged on and active.
Does anyone know of a potential solution?Hi,
Apologize to say that there seems to be no built-in to do that.
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a standard period of inactivity
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Inactive sessions in v$session. True problem
Hi,
I am working in an Oracle 9i/Weblogic/J2EE platform. And when i look for session info in v$session view, i see that there are many sessions that have a status "Inactive". I already figured out what it means- the session is ACTIVE when it is doing an SQL query at the time and the session is INACTIVE when it is not doing an SQL query at that particular moment.
But i have questions:
1) If a client logs in to my webapplication and does a SQL query- then the sessions status is ACTIVE. After that, when the client just leaves (logs out just closes the browser) then Oracle marks that connection as 'INACTIVE'- Oracle does not KILL that session.
Ok let that be, but can another client then log in to my webapplication (from different computer) and get that same INACTIVE connection and start to use it?? If not, then these "abandoned" connection are truly useless, because they still use ORACLE resources (memory).
2)Another thing is that there are many INACTIVE sessions in v$session that have a name "plsqldev.exe" in PROGRAM column. That is a database client that i use to connect directly to my DB. But basicly i have only one PL/SQL program with one SQL query window open (this session is marked ACTIVE in v$session). So are these other 10 INACTIVE "plsqldev.exe" sessions meant for new plsql clients that may start to use the database or can only that particular user for whom the session was created at first place use that session?
And finally- sessions that are INACTIVE and have "plsqldev.exe" as a PROGRAM in v$session - is there any chance that a client logs in to webapplication and then gets that INACTIVE session?
If not, then these 10 INACTIVE plsqldev sessions (allthough the user has maybe shut down the program) are wasteless for webapplication users and they just starve the database.
Also a screenshot for illustration.
Waiting for your comments,
Thanks!If connection pooling is in use then yes a different end-user can reuse the "inactive" session. Remember that ACTIVE and INACTIVE really only refers to if the session is executing SQL at the exact moment you query v$session.
In the case of a dedicated user connection using a product like Oracle Forms where the user spends much of the time reading and filling in screen fields the Oracle background session can show INACTIVE almost constantly because the queries being ran by the user are very fast.
Take a look at the last_call_et column. This is the time in seconds from when the last SQL statement was issued (not completed). If this value is resetting then the queries are being done.
If the time is large and the status is INACTIVE then you could have a 'dead' or 'runaway' background process which is a background process without a front-end process. Those can and should be terminated. For that matter sessions that are idle for long periods of time should probably also be killed. If nothing else runaway and idle sessions may make it appear you are using all your licensed connections even if you really are not.
Most connection pools wil automatically restart a terminated connection so if you clean-up process terminates an idle pooled connection it should not be a problem.
HTH -- Mark D Powell -- -
Inactive sessions of oracle consume resources?
We Red Hat and Data Base Oracle 10g.
Gracias y saludos.Please define 'inactive session'.
I see several possible definitions. A few of the more likely include:
- a session that is still connected to the end client, and therefore prepared to perform some work and therefore will consume resources
- a session that has been forcibly disconnected and is rolling back or waiting to roll back, and is therefore consuming resources
- a Linux or Unix zombie session, which may still hold memory but no CPU cycles
Depending on the tools used to report the information, the SGA memory may be reported again and again for each session's process. This can cause some alarming interpretations. -
Inactive sessions accumulate exceed the max session
Hi All,
once i checked the v$session, always find lots of inactive session.nearly after two month it will exceed the max session value in the init.ora profile.
I have check the sqlnet.ora profile and the value of expire_time is 10 minuter, while not sure why so many inactive session? and if i need to kill all inactive session?
Best Regards,
ChelseaINACTIVE users are users not actively running a query, but they are connected to the database.
If SQL expire time is set, you can verify the logfiles, if users get disconnected because of idle connections.
For the remainder I agree with the other post.
Cheers
FJFranken -
So many INACTIVE sessions in Database
Hi,
Actually PMON will clears all inactive sessions from database.
But i can see there are sessions like more then 3,4 days old.
Why PMON is not clearing them. ?
On which intervals will PMON do inactive sessions cleaning.
thanks in Advance.>
But i can see there are sessions like more then 3,4 days old.
>
Heed the advice of the other responders.
But for idle sessions that you want cleared immediately you can use
ALTER SYSTEM DISCONNECT SESSION . . . IMMEDIATENOTE - this acts differently than the 'KILL SESSION' syntax typically used.
See 'DISCONNECT SESSION' clause in the SQL Language reference section for ALTER SYSTEM
http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_2013.htm
>
Use the DISCONNECT SESSION clause to disconnect the current session by destroying the dedicated server process (or virtual circuit if the connection was made by way of a Shared Sever).
The IMMEDIATE setting disconnects the session and recovers the entire session state immediately, without waiting for ongoing transactions to complete.
>
Then contrast that with the text for KILL SESSION -
JDBC sessions timout - for inactive sessions
how can i define the timeout of inactive sessions (connections) on oracle database thru JDBC connetionPool technology - to de disconnected physically, is there a default timeout for the sessions to be disconnected.?
thanks for any help.The following is the Data Source that I am using:
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE data-sources PUBLIC "Orion data-sources" "http://xmlns.oracle.com/ias/dtds/data-sources.dtd">
<data-sources>
<data-source
name="jdev-connection-Teradata"
class="com.evermind.sql.DriverManagerDataSource"
location="jdbc/TeradataCoreDS"
xa-location="jdbc/xa/TeradataXADS"
ejb-location="jdbc/TeradataDS"
pooled-location="jdbc/TeradataPooledDS"
connection-driver="com.ncr.teradata.TeraDriver"
username="GavinLDCHBull"
password="xxxxxx"
url="jdbc:teradata://FONEBONE/DATABASE=HABWaiver"
inactivity-timeout="30">
</data-source>
</data-sources>
We are using the ADF framework (i.e. entities and simple views) for accessing all Teradata data. I do not explicitly issue any JDBC calls for accessing the data. When I update the data, I use JDBC calls to initiate stored procedures. However, the problem (not closing the statements) happens almost immediately after starting the application, and prior to issuing any stored procedures.
I have not tried to duplicate the problem using a simple java program because I am using ADF for data access (again, I don't explicitly issue any JDBC statements). -
DAC has 19 inactive sessions in Repository Database
Is this normal for the DAC to leave open 19 inactive sessions in the Repository Database when it is not running? Some of the last statements it ran were: SELECT SYSDATE FROM DUAL, etc
Shouldn't it close some of these sessions when not running? I understand that it should leave open at least 1 so that it can fulfill it's 'Heartbeat Interval' requirements.
Any insight into this issue would help greatly.
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Andycan you upload a screenshot of DAC to explain your question?
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PL/SQL procedure to kill inactive session
Hi all ,
Please i am trying to write a procedure to kill inactive sessions of the shema 'TESTSCHEMA' .This is my first procedure , am not use to pl/sql but i went through many turtorial but have some errors at compliation .when i try to compile the procedure the errors are as below :
15:50:28 Start Find Objects [TESTSCHEMA@TESTDB_UNIX(2)] ...
15:50:28 End Find Objects [TESTSCHEMA@ TESTDB_UNIX(2)]
15:50:32 Start Compiling 1 object(s) ...
15:50:32 Executing ALTER PROCEDURE fib_dead_cnx_cleanup COMPILE ...
15:50:32 [13:2] PL/SQL: ORA-00933: SQL command not properly ended
15:50:32 [9:3] PL/SQL: SQL Statement ignored
15:50:32 [18:12] PLS-00103: Encountered the symbol "(" when expecting one of the following:
15:50:32 constant exception <an identifier>
15:50:32 <a double-quoted delimited-identifier> table LONG_ double ref
15:50:32 char time timestamp interval date binary national character
15:50:32 nchar
15:50:32 The symbol "<an identifier>" was substituted for "(" to continue.
15:50:32 [18:21] PLS-00103: Encountered the symbol "LOOP" when expecting one of the following:
15:50:32 := ; not null default character
15:50:32 The symbol "; was inserted before "LOOP" to continue.
15:50:32 [27:8] PLS-00103: Encountered the symbol "ALTER" when expecting one of the following:
15:50:32 begin case declare exit for goto if loop mod null pragma
15:50:32 raise return select update while with <an identifier>
15:50:32 <a double-quoted delimited-identifier> <a bind variable> <<
15:50:32 close current delete fetch lock insert open rollback
15:50:32 savepoint set sql execute commit forall merge pipe
15:50:32 Compilation complete - 5 error(s) found
15:50:32 End Compiling 1 object(s)
below is the procedure code :
CREATE OR REPLACE
PROCEDURE fib_dead_cnx_cleanup
AS
l_serial CHAR(100);
l_sid CHAR (100);
l_sid_serial CHAR(100);
l_count NUMBER(10,0);
CURSOR session_cur IS
SELECT sid,serial#,sid||','||serial# as sid_serial
FROM v$session
WHERE username='EBBFCAT' and schemaname='TESTSCHEMA'
and status='INACTIVE'
BEGIN
BEGIN
l_count := 0;
OPEN session_cur;
WHILE ( 1 = 1) LOOP
BEGIN
FETCH session_cur INTO l_sid ,l_serial,l_sid_serial ;
EXIT WHEN session_cur%NOTFOUND ;
BEGIN
alter system kill session 'l_sid_serial' ;
END;
END;
END;
CLOSE session_cur;
END;
END FIB_DEAD_CNX_CLEANUP;
ThanksHi,
Never write, let alone post, unformatted code.
When posting any formatted text on this site, type these 6 characters:
{code}
(small letters only, inside curly brackets) before and after sections of formatted text, to preserve spacing.
Among the benefits of formatting: you can indent to show the extent of blocks, such as BEGIN-END.
Different types of blocks need modifiers after the end, such as "END *IF* " and " END *LOOP* ". If each opening statement (BEGIN, IF, LOOP) is directly above its corresponding END, then it's easy to check if you got the right modifier.
Here's what you code looks like with some formatting, and a couple of corrections added. Look for -- comments.
CREATE OR REPLACE
PROCEDURE fib_dead_cnx_cleanup
AS
l_serial CHAR(100);
l_sid CHAR (100);
l_sid_serial CHAR(100);
l_count NUMBER(10,0);
CURSOR session_cur IS
SELECT sid
, serial#
, sid || ','
|| serial# as sid_serial
FROM v$session
WHERE username = 'EBBFCAT'
and schemaname = 'TESTSCHEMA'
and status = 'INACTIVE'; -- need semicolon here
BEGIN
BEGIN -- Why?
l_count := 0;
OPEN session_cur;
WHILE ( 1 = 1)
LOOP
BEGIN -- Why?
FETCH session_cur
INTO l_sid
, l_serial
, l_sid_serial ;
EXIT WHEN session_cur%NOTFOUND ;
BEGIN -- Why?
alter system kill session 'l_sid_serial' ; -- Not a PL/SQL command
END;
END;
END LOOP; -- LOOP ends with END LOOP
CLOSE session_cur;
END;
END FIB_DEAD_CNX_CLEANUP;Take baby steps.
I've been wrtiing PL/SQL for 20 years, and I would never write that much code at once. If you're a beginner, all the more reason to start small. Write as little as possible, test, debug and test again (if necessary). When you have someting working, add 2 or 3 more lines and test again.
It looks like you have three BEGIN statements that don't serve any purpose. You should get rid of them (and their corresponding END statements, of course).
One error I did not fix: ALTER SYSTEM is not a PL/SQL statement. It's a SQL statement. You can run a SQL statement inside PL/SQL by using dynamic SQL, where you construct a string containing the SQL statement, and then use dbms_sql or EXECUTE IMMEDIATE to run it.
Edited by: Frank Kulash on Aug 18, 2009 12:37 PM -
How do you find out if the transmitter and/or receiver leaves the session ?
So , how do you find out if the transmitter and/or a receiver leaves the session , is there an event when this happens ?
1. There is no list available from your end.
2. You can't actually check. If you suspect a device has been, deauthorize it twice and then authorize it.
(89509) -
Iam in need of a script to kill all the inactive sessions in the database and the same script should kill all the pid related in the OS also.
can anyone send me a scripts or any input on this will be of great help ?
KaiKaiS,
See both functions and wrap around in your unix script, this should magic for you I suppose :) and you should replace sqlplus "/as sysdba" by sqlplus '/as sysdba'
*function readSqlstmt {*
typeset stmt=$1
echo "
set feedback off
set verify off
set heading off
set pagesize 0
whenever sqlerror exit 1
whenever oserror exit 2
*$stmt;*
exit
*" | sqlplus -S "/as sysdba" >> test.log*
function killpid {
killpidsql=killpid.sql
sqlplus -s "/as sysdba" << ENDOFSQL >> test.log
whenever sqlerror exit 1
whenever oserror exit 2
SET pagesize 0
SET verify off
SET feedback off
SPOOL ${killpidsql}
SELECT 'ALTER system kill session ''' || s.sid || ',' || s.serial# || ''';'
FROM v\$session s, v\$process p
WHERE s.paddr = p.addr AND s.status = 'INACTIVE';
SPOOL OFF
@${killpidsql}
ENDOFSQL
Example: How to use above readSqlstmt function, to kill unix process id and call "killpid" to kill sessions from oracle.
*readSqlstmt "SELECT p.spid FROM v\$session s, v\$process p WHERE s.paddr = p.addr AND s.status = 'INACTIVE'" | while read u*
*do*
* #echo "kill -9" $u >> test.log*
* echo $u*
*done*
*Regards*
Edited by: OrionNet on Dec 10, 2008 10:52 PM
Edited by: OrionNet on Dec 10, 2008 10:54 PM -
Inactive sessions in v$session
Hi,
why there are so many apps user inactive sessions in v$session?
RegardsHi Hussein,
The process which are arctive are shown as inactive in v$session view,We cannot trust the status column of this view,By default as soon the apps is started the oracle is creating around 82 to 85 apps processes which are inactive but i think they are active.
The option referenced above is a good one to follow in this situation
A discussion of Dead Connection Detection, Resource Limits, V$SESSION, V$PROCESS and OS processes
Thanks Hussein and Anchorage
Regards -
How to reconnect to a disconnected remote ssh session on solaris 10
hi all
How to reconnect to a disconnected remote ssh session on solaris 10
is there a way to accomplish thisNo, there's not.
A common solution for this is to get a copy of 'screen'. After connecting via ssh (or any other protocol), you can start a "screen" session. If you get disconnected (or disconnect intentionally), you can later come back on the machine and bring your existing "screen" session back.
Darren -
We are using Oracle 11 as a backend to PowerSchool (a student information system) with 6 application servers (dc-ps-01 thru -06). Using the following SQL, we are seeing numerous INACTIVE sessions vs ACTIVE.
select
count(b.machine) as mCount,
b.machine box,
b.status,
b.osuser os_user,
b.program program
from
v$session b, v$process a
where
b.paddr = a.addr and type='USER'
group by
b.machine,b.osuser,b.program,b.status
order by
b.status, mCount desc, box;
Sample output:
MCOUNT Box Status OS_USER Program
*2 DC-PS-01* ACTIVE powerschool JDBC Thin Client
1 DC-PS-DB1 ACTIVE DC-PS-DB1$ OMS
1 DC-PS-DB1 ACTIVE SYSTEM ORACLE.EXE (J001)
1 DC-PS-DB1 ACTIVE SYSTEM ORACLE.EXE (J000)
406 DC-PS-05 INACTIVE powerschool JDBC Thin Client
*44 DC-PS-01* INACTIVE powerschool JDBC Thin Client
36 DC-PS-03 INACTIVE powerschool JDBC Thin Client
32 DC-PS-04 INACTIVE powerschool JDBC Thin Client
28 DC-PS-02 INACTIVE powerschool JDBC Thin Client
17 DC-PS-06 INACTIVE powerschool JDBC Thin Client
7 DC-PS-DB1 INACTIVE DC-PS-DB1$ OMS
While the number of ACTIVE sessions fluctuate, the number of INACTIVE ones do not decrease. Would someone explain the internal working of this?
Thanks!Note that the status column of v$session only shows ACTIVE while the Oracle session background process is busy performing a SQL statement on behalf of the front-end session. If the application spends most of its time with the user entering data onto or reading results off a screen then the session is going to appear INACTIVE most of the time in Oracle.
Also check the last_call_et to see how long it has been since the session issued a request to Oracle. This is how to tell if the session is truely INACTIVE.
If the front-end application uses connection pooling then depending on how many connections the application is set to grab and what kind of connection pool session management the front-end product provides you can have a lot of basically unneeded and truely inactive sessions.
HTH -- Mark D Powell -- -
DBA Reports large number of inactive sessions with 11.1.1.1
All,
We have installed System 11.1.1.1 on some 32 bit windows test machines running Windows Server 2003. Everything seems to be working fine, but recently the DBA is reporting that there are a large number of inactive sessions throwing alarms that we are reaching our Max Allowed Process on the Oracle Database server. We are running Oracle 10.2.0.4 on AIX.
We also have some System 9.3.1 Development servers that point at separate schemas in this environment and we don't see the same high number of inactive connections?
Most of the inactive connections are coming from Shared Services and Workspace. Anyone else see this or have any ideas?
Thanks for any responses.
Keith
Just a quick update. Originally I said this was only with 11.1.1.1 but we see the same high number of inactive sessions in 9.3. Anyone else see a large number of inactive sessions. They show up in Oracle as JDBC_Connect_Client. Does Shared Service, Planning Workspace etc utilize persistent connections or does it just abandon sessions when the windows service associated with an application is shutdown? Any information or thoughts are appreciated.
Edited by: Keith A on Oct 6, 2009 9:06 AMHi,
Not the answer you are looking for but have you logged it with Oracle as you might not get many answers to this question on here.
Cheers
John
http://john-goodwin.blogspot.com/
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