5 in 10000 connections remains open --- Why?

Hi:
I am currently working of a real high volume application that uses
WLS 5.1, WLS RMI JDBC Driver, Oracle DB 8i.
The deal is --- code looks right. Every connection that is opened is then closed after doing all the DB specific stuff. No issues on that front. In a low volume environment no connections are lost. However in production environment, with the number of users scaling up the connections gets lost!.
Today we lost about 5 connection out of 14,000 granted connection. The pool size is 200 and we are hovering about 130 lost connections. The server will then need a reboot at the end of day to refresh the pools.
Any ideas would would be great!
Thanks
~v

Sounds to me like you have a thread synchronizing problem...

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XA connections remain open

We are using Oracle 9.0.2, JDBC thin driver 9.0.2 and Weblogic 6.1 We create XA
connections (without pooling) directly from the middle-tier (Weblogic server)
to the database. We have noticed that these XA connections remain open for an
arbitrary amount of time after the connection was closed by the middle-tier. Has
anyone experienced similar problem? Does anyone know what can keep an XA connection
open after the connection.close() has been issued.
Thanks in advance, Eugenia

Eugenia,
According to the WLS 7.0 release notes in the e-docs site:
"WebLogic Server applications that use distributed transactions with Oracle
Server 9.2.0.x are experiencing problems with the Oracle thin driver
9.2.0.x. For such applications, BEA recommends against using Oracle thin
driver 9.2.0.x at this time. Instead, use a 9.0.1.X driver, where X is 3 or
higher. "
Hope this helps.
"Eugenia" <[email protected]> wrote in message
news:[email protected]..
>
We are using Oracle 9.0.2, JDBC thin driver 9.0.2 and Weblogic 6.1 Wecreate XA
connections (without pooling) directly from the middle-tier (Weblogicserver)
to the database. We have noticed that these XA connections remain open foran
arbitrary amount of time after the connection was closed by themiddle-tier. Has
anyone experienced similar problem? Does anyone know what can keep an XAconnection
open after the connection.close() has been issued.
Thanks in advance, Eugenia

RFC Connection remains open after portal logoff

Hi,
We have configured Universal Worklist in our EP7 EHP1 SPS4 Portal.
When a user connects to the Portal and launches the UWL it creates an RFC connection to the backend ECC. However, when the user moves away from UWL iview or logs out or closes the browser the RFC connection in the backend still
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Thanks,
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Hi my friend
It costs time and resources to establish an RFC connection, therefore it is not immediately deleted but maintained by the system to be reused. But in case there're special purpose to control RFCs, here're 2 parameters to do so:
The parameter gw/gw_disconnect is a timeout in seconds to close the TCP connection between two SAP gateways if there is no RFC connetion on it for the given timeout. But if there is an active RFC connection onit it will not be closed even if there is no traffic on that RFC connection. Thats why you need another parameter.
The parameter gw/keepalive is used to periodically check all active RFC (and other) gateway connections if there was no traffic on them for the given time.
Regards,

ODBC connection remains open after disconnect

Hello,
in my application I use 2 ODBC connects to 2 different ODBC drivers.
My problem:
When I close one connection (with DBDisconnect), the connection on the database remains open until I close the second one.
Is this a known behavior?
Is there a way to force the closing or to make it independant of the other connection?
Regards
Fred
Solved!
Go to Solution.

As ODBC connections are not inherently included in the CVI environment, I looked up the DBDisconnect function and it says that the DBDisconnect function disconnects the last connected ODBC database. So it is expected behavior.
Ian M.
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Database connection remains open after close being called

I am using oracle OC4J as my application server. I am not using connection pool and I am using non-pooled datasource to get connection. The database connection is made at runtime and then closed. I want to test if the users' connection sessions have been killed after they logout the application. But when I checked the table v$session in the database, it shows one connection remaining. I checked my program, the close method has been called. Does anybody know the solution?

Hi Chen,
This is just a suggestion for something to try -- only if you haven't
already tried it, that is!
Try running OC4J in "debug" mode. Here are details on how to do that:
http://kb.atlassian.com/content/atlassian/howto/orionproperties.jsp
Hope this helps you!
Good Luck,
Avi.

SQL Connections remain open after Crystal Report closes

I am wirting an interface to use the crystal report viewer to print reports, connecting to a Progress Open Edge 10.1B database. From our application we declare the application, report, exportoptions and connectionproperties objects and pass these to the crystal reports viewer. Once the report is printed we release the objects and set their variables for null. However we are finding that the SQL connection to the database is remaining connected and we can only release the connection by manually going in a disconnecting.
I have read in forums that people use .dispose or .close to release the connection, however we do not have access to these methods as we do not use .NET. Are there any methods we can use to disconnect these sql connections?

Hi Dean,
Moved to the Legacy Application forums. Likely using the RDC as your report engine.
You should still be able to close and dispose of the report objects. They are not specific to .NET.
In VB it would look something like these lines::
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Once the report is closed it should disconnect from the DB. If you close the application does that disconnect?
Have you looked on 4GL's site for info on how to?
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Don

Connection remains opened even after calling conn.close

i have a need to copy records from one table in a database (say db1) to another table in another database(say db2). I open connection to both databases, and get a Recordset (say rs1) by executing a query that contains all rows that i have to insert in the database db2. Next i get an empty recordset(rs2) on the table in the database db2 (with locktype batchoptimistic, clientside cursor). i loop on rs1 and for each row in rs1 i insert a row in rs2 and copy the fields. after all rows are done, i delete the rows from db2 that will be affected and do an updatebatch on rs2. then i close the recordsets and the connections
everything works fine except that the connection with the db2 is not getting closed, neither is it throwing any exception. when i comment the updateBatch code the connection closes normally.
can anyone please help me out, where am i going wrong.
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Hi,
There is one more thing that I want to add to the above question. After calling conn.close() I checked the status of the connection and it was not 'OPEN' but when I checked session information through DBA studio it was showing one connection. I enabled trace of Oracle provider for OLE DB. Trace showed that two sessions were opened but only one session was closed.
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Sockets remaining open after connection failure

Hi - I have a multithreaded application that runs as a daemon (always up) and uses OCI (10.2.0, 64-bit client). If a database connection or query fails for any reason, it is coded to keep on retrying on a set schedule until it succeeds. The application runs on RHEL 4 (64-bit) and is compiled with g++ 3.4.6. (It's nominally C++, but is really what I call "C with objects" as it doesn't use a lot of the standard C++-isms, though there are objects -- the OCI code in question is in a C++ object wrapper that I wrote.)
Anyway, about 5 days ago, the database where most of the queries are run went down (it's a 10g server; I don't remember the exact version, but since it's down, I'm not sure it matters), and it has not come back up, although the hosts it runs on are up. Meanwhile, my application kept failing to connect and retrying, and the number of queries that this was happening to kept on growing as new ones are added every day. Unknown to me, the failed connection attempts were leaving open TCP sockets to the database that was down, until eventually the maximum open files on the system was exceeded and I was forced to reboot. Twice. (It happened again the next day.)
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The sockets do close, by the way, if the application is stopped and restarted. But they remain open as long as the instance that created them is still running. (I added a periodic restart to clean things up, but I'd really like to fix the problem instead of using a stopgap like this!)
Sample code is below. This first bit is what is used to connect and log in. (Note that I have this mutex-locked -- I know OCI is supposed to be thread-safe if you use the OCI_THREADED attribute, but I've been having so many issues that I thought it was safer.)
if (check_err(OCIEnvCreate(&env, (OCI_THREADED), (void *) 0, 0, 0, 0, (size_t) 0, (void **) 0)) != 0)
fprintf(stderr, "Error allocating OCI environment handle\n");
return;
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if (check_err(OCIHandleAlloc((void *) env, (void **) &err, OCI_HTYPE_ERROR, 0, (void **) 0)) != 0)
fprintf(stderr, "Error creating OCI error handle.\n");
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if (check_err(OCIHandleAlloc((void *) env, (void **) &server, OCI_HTYPE_SERVER, 0, (void **) 0)) != 0)
fprintf(stderr, "Error allocating OCI server handle.\n");
return;
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if (check_err(OCIHandleAlloc((void *) env, (void **) &svc, OCI_HTYPE_SVCCTX, 0, (void **) 0)) != 0)
fprintf(stderr, "Error allocating OCI service handle.\n");
return;
[Note: these are snippets from two different functions; this is a C++ wrapper that uses OCI, so the above code is in the database object constructor, and below is a separate login function.]
// Attach to server.
retcode = OCIServerAttach(server, err, (text *) curDS, strlen(curDS), OCI_DEFAULT);
if (check_err(retcode))
fprintf(stderr, "Error attaching to Oracle server.\n");
return(retcode);
// Set server attribute in service handle.
retcode = OCIAttrSet((void *) svc, OCI_HTYPE_SVCCTX, (void *) server, 0, OCI_ATTR_SERVER, err);
if (check_err(retcode))
fprintf(stderr, "Error setting OCI server attribute.\n");
return(retcode);
// Allocate session handle.
retcode = OCIHandleAlloc((void *) env, (void **) &sess, OCI_HTYPE_SESSION, 0, (void **) 0);
if (check_err(retcode))
fprintf(stderr, "Error allocating OCI session handle.\n");
return(retcode);
// Set username attribute in session handle.
retcode = OCIAttrSet((void *) sess, OCI_HTYPE_SESSION, (void *) curUser, strlen(curUser), OCI_ATTR_USERNAME, err);
if (check_err(retcode))
fprintf(stderr, "Error setting OCI username.\n");
return(retcode);
// Set password attribute in session handle.
retcode = OCIAttrSet((void *) sess, OCI_HTYPE_SESSION, (void *) curPass, strlen(curPass), OCI_ATTR_PASSWORD, err);
if (check_err(retcode))
fprintf(stderr, "Error setting OCI password.\n");
return(retcode);
// Start session.
retcode = OCISessionBegin(svc, err, sess, OCI_CRED_RDBMS, OCI_DEFAULT);
if (check_err(retcode) != 0)
return(retcode);
// Set session attribute in service handle
retcode = OCIAttrSet((void *) svc, OCI_HTYPE_SVCCTX, (void *) sess, 0, OCI_ATTR_SESSION, err);
if (check_err(retcode))
fprintf(stderr, "Error setting OCI session attribute.\n");
return(retcode);
If any of the above calls returns an error, the next call is to the database object destructor (also mutexed), which looks like this:
if (connected && svc && err && sess && check_err(OCISessionEnd(svc, err, sess, OCI_DEFAULT)))
fprintf(stderr, "Oracle - Error ending session\n");
if (connected && server && err && check_err(OCIServerDetach(server, err, OCI_DEFAULT)))
fprintf(stderr, "Oracle - Error detaching from server\n");
if (connected && server && check_err(OCIHandleFree((void *) server, OCI_HTYPE_SERVER)))
fprintf(stderr, "Oracle - Error freeing server handle\n");
if (connected && svc && check_err(OCIHandleFree((void *) svc, OCI_HTYPE_SVCCTX)))
fprintf(stderr, "Oracle - Error freeing service handle\n");
if (connected && err && check_err(OCIHandleFree((void *) err, OCI_HTYPE_ERROR)))
fprintf(stderr, "Oracle - Error freeing error handle\n");
if (connected && env && check_err(OCIHandleFree((void *) env, OCI_HTYPE_ENV)))
fprintf(stderr, "Oracle - Error freeing environment handle\n");
Anyone else had this happen? Any insights/help would be greatly appreciated!
Oh, one more note: though the application is multithreaded, none of the database objects or connections is shared -- each thread makes its own connections and maintains database objects separately. I added the mutex locks because Helgrind was reporting race conditions on handle allocations and deallocations.
Thanks,
--Tina

Hmm, I believe I did have an OCIHandleFree on the session handle in an earlier version of the code. I can't remember why I took it out, but I do remember that there was a reason -- it was causing a problem. (Yeah, I know, vague enough for ya?) Anyway, the OCI documentation said that when you call OCIHandleFree on the environment handle, any child handles would be implicitly freed, so I assumed it wouldn't be a problem. Still, I'll try putting it back and see what happens. Thanks.
Oh, and to answer your question (about netstat), it said the processes were ESTABLISHED. But the Oracle server was down (although the hosts it resided on were up). The connection attempt failed with the error message:
ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Message was edited by:
user613364

Cursors remained open after closing connection

I am using OC4J 10g (Application Server) and Oracle10g DB. OC4J is maintaining the connection pool(com.evermind.sql.DriverManagerDataSource). I get the connection from pool and call DB procedure, then close resultset, statement and connection. It closes the opened cursors against resultset. But left some implicit cursors opened and never closed so cursor count is going to increase.
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Hi Justin,
Thnx for your reply and you're understanding is correct but the problem I face is when multiple concurrent users access the JSP page from which I'm actually calling the servlet to retrieve the image, the number of cursors being left open increases. As the load on the page increases (i.e. no of usesrs increase) oracle seems to have problems in garbage collecting the open cursors ... which eventually leads it to throw maximum cursors exceeded exceptions.
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HT4199 Every time I introduce the WPA2 passwords I can´t connect. I can only connect to open wi fi networks? Does anyone know why? Thanks

Every time I introduce the WPA2 passwords I can´t connect. I can only connect to open wi fi networks? Does anyone know why? Thanks

Some users with various Wi-Fi connection problems have reported that they were given the following instructions by Apple Support, sometimes with success. I can't vouch for this procedure myself. After completing the procedure, you'll have to recreate all your settings in the Network preference pane. Make sure you know how to do that before you begin. Taking screenshots of the preference pane may be helpful.
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Back up all data.
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Why won't Firefox 4 on Mac OSX 10.6.7 quit when QUIT is selected? The window closes, but the application remains open necessitating a forced-quit. Until recently it worked fine. I've reinstalled Firefox but the problem persists.

Firefox 4 on Mac OSX 10.6.7 won't quit when QUIT is selected.
The window closes, but the application remains open necessitating a forced-quit. Until recently it worked fine. I've Downloaded Firefox again and reinstalled but the problem persists.

Perform the suggestions mentioned in the following articles:
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Check and tell if its working.

Why do ports remain open after closing Firefox?

I have noticed recently that several ports associated with Firefox remain open when the Firefox browser is closed. The number of open ports increases each time Firefox is opened and I have seen that the number of open ports has reached to more than 1,000 open ports at a time. The majority of the open ports are outbound TCP using port 443 and I also note a sustained increase in the network traffic after Firefox is closed.
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You can set the pref browser.download.manager.quitBehavior to 2 on the about:config page.
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Excessive no. of ports remaining open with HttpUrlConnection

Hi,
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I am facing problem where excess no. of TCP ports getting opened or remaining open on clientCompared to what?
The scenario happens when I simulate a load of 100 concurrent requests through JMeter (SOAP/XML-RPC requests)Aha.
What's wrong here that is causing excessive TCP IP ports to remain open? Nothing except your definition of 'excessive'. You are simulating hundreds of clients on one client host so you will get all the bahaviour of those client hosts in your single client host. The problem is in the simulation, not the TCP ports.
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Cannot turn off Homesharing to AppleTV: IPv6 connections remain

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Visited the "genius" bar this afternoon - what a trip!! The guy said this is a Verizon issue, period. I was like you must be kidding, there are SO many people out there who got affected and not everyone uses verizon ... he actually got pretty mad and said you should be using mac hardware (router) and secure network. I even told him my second Macbook is working fine on the same Verizon network. This is their new location in the Northern VA area at Fair Oaks Mall.
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Thanks.

5 in 10000 connections remains open --- Why?

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