Free pooled db connections

We've just enabled the PersistenceManager connection pooling, which is
causing problems becuase we're leaking connections when we redeploy our
webapp (we're using tomcat).
I can have the servlet.destroy() method invoked when we're undeploying
our app, how can I instruct kodo to close/free all pooled DB connections?
thx,
david

We are using oracle and tomcat.
"Alex Roytman" <[email protected]> wrote in
news:b8u57c$gq0$[email protected]:
I will package it and put on our web server over weekend. If you need
it urgently I can email binaries and source to you now (no docs but
tomcat config sample)
What Database and web server are you using (if it oracle/tomcat I can
supply samples of config files too)
"Frank Riley" <Frank_Riley@NOSPAM|stchome.com> wrote in message
news:[email protected]..
Where can we get this?
"Alex Roytman" <[email protected]> wrote in
news:b8s528$fqe$[email protected]:
Another option is to use external connection pooling component.
I will be glad to offer our's - it is open source (but not
published) the only requirement is JDBC2 compliant driver - it
relies on JDBC2 and does not wrap JDBC1 drivers
Our pooled datasource supports getConnection() and
getConnection(user, password) pooling, different growth policies,
eviction of failed connection without exposing exception to client
(might depend on driver, tested with oracle) - so bad connection is
disposed of and new one returned to the client, timer based
eviction of idle connections from the pool (so it will gradually
reduce number of idle connections in your pool to zero - very
convenient for closing all connections during the night), plus
management interface for getting pool statistics and clearing
pool(s) as needed even for getConnection(user, password) pools
designed to work in JNDI env. tested with tomcat4
"David Michaels" <[email protected]> wrote in message
news:b8k97c$qel$[email protected]..
We've just enabled the PersistenceManager connection pooling,
which is causing problems becuase we're leaking connections when
we redeploy our webapp (we're using tomcat).
I can have the servlet.destroy() method invoked when we're
undeploying our app, how can I instruct kodo to close/free all
pooled DB connections?
thx,
david

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Connection Pooling and Connection Identity

On this link:
http://java.sun.com/products/jndi/tutorial/ldap/connect/config.html
I read that: "The LDAP provider maintains pools of connections; each pool holds connections (either in-use or idle) that have the same connection identity."
This to me suggested that if I am doing "simple" authentication then the "connection identity" consists of:
1) connection controls
2) host name, port number as specified in the "java.naming.provider.url" property, referral, or URL supplied to the initial context
3) java.naming.security.protocol
4) java.naming.ldap.version
5) java.naming.security.principal
6) java.naming.security.credentials
But when I run a test where user1, user2 and user3 login over and over again, I see (from tracing the conenctions) that 3 TCP connections are bing reused for user1, 2 and 3.
Now this is good as it shows that pooled connections are being reused...BUT what I don't understand is why do I keep seeing new bind requests on each of these connections for the same user? for example, the TCP connection for user1 shows a series of BIND requests for user1.
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Hi,
Can someone clarify the difference between connection pool and connection factory.
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To conserve system resources and to improve the performance of transactional applications, WebLogic allows you to define a pool of client connections (generally database but may be a FTP,FILE etc. as well)
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How to fix:
Error occurred in deployment step 'Recycle IIS Application Pool': Cannot connect to the SharePoint site: Make sure that this is a valid URL and the SharePoint site is running on the local computer. If you moved this project to a new computer or if
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Hi
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Not Converted : Free-hand SQL connection problem

While converting a Free Hand SQL report from Desktop Intelligence to Web Intelligence report in BI XI 3.1, I am faced with the problem
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Ajay,
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The conversion from DeskI to WebI is in the same version BI XI 3.1 and not to BI 4.0 in which Free Hand SQLs is not supported.
I have converted one other Free Hand SQL Report with an error "Partially Converted : <REPNAME2> - Conditional or permanent Hide Header not available in Web Intelligence", for which I had to edit the report in InfoView and un-tick the "Show When Empty" property of the table ( http://www.forumtopics.com/busobj/viewtopic.php?t=197157&view=next&sid=e6840aafa2d1267c66dae164d1dbf9db ). I think the solution mentioned in this link does not meet the purpose as the table is not displayed in the design time after the above untick.
Coming back to our issue, further probing into this aspect I stumbled upon this link meant for RCT for BI 4.0 version
https://csdwportal.dhhs.state.nc.us/downloads/Business%20Objects%20XI%20R4.0%20Docs/SAP%20BusinessObjects%20Report%20Con…
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Auto-Commit and Pooled JDBC Connections

Forum Members,
If I am using Oracle Pooled JDBC Connections in the OC4J container is auto-commit set to "true" by default?
If I set auto-commit to "false" and then close the logical connection, when that connection is handed out again on a later call to getConnection(), is auto-commit automatically set back to "true"?
Thanks,
Richard

Richard,
Pardon me if I am stating the obvious, but you could test that in your code by invoking the getAutoCommit() method in interface java.sql.Connection.
My experience (with OC4J stand-alone versions up to -- and including -- 10.1.2) is that the behaviour depends on which data source you have configured. For example, if you have defined an "ejb-location" attribute in your "data-sources.xml" file, and you use that as your JNDI lookup for your data source, then OC4J handles transactions and you shouldn't deal with "auto-commit" at all. See the following post for more details:
Re: OC4J 10.1.3 Preview 4 - Global transaction active
But if you have defined a "location" attribute and use that, then you do need to handle transactions explicitly.
Hope this helps.
Good Luck,
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Obtaining an oracle.sql.STRUCT through a pooled JDBC connection

Hello,
I am using WebLogic Server 10 and and Oracle 10 and I am trying to obtain a vendor-specific oracle.sql.STRUCT from a ResultSet using a pooled connection defined in Weblogic. I need the vendor-specific object, rather than simply the java.sql.Struct implementation, because a third party library requires it.
What gets returned in the ResultSet is a non-exposed WebLogic wrapper object which implements java.sql.Struct, but which cannot be cast to an oracle.sql.STRUCT. I can use reflection on this object to find and call the getVendorObj() method to obtain the oracle.sql.STRUCT, but this solution is not acceptable because this is not a published API and is not guaranteed not to change in future versions.
How can I reliably obtain a vendor-specific implementation of java.sql.Struct through a WebLogic connection pool in WebLogic Server 10?
Thanks for any advice,
-Dan Schwemlein

dan schwemlein wrote:
Joe,
Thanks again. With your guidance, I have arrived at the following approach, which I'll post for the benefit of others, and which I'd be thankful if you would validate:
1) Import the jar com.bea.core.datasource-1.0.0.0.jar from %BEA_HOME%\modules, which is the only location of the class WLConnection, which is the only class with the getVendorConnection() method you refer to.
2) Get the logical connection from the pooled data source, cast it to a WLConnection, call getVendorConnection() to obtain an OracleConnection (from the ojdbc jar), and use this connection to obtain the required oracle.sql.STRUCT from an OracleResultSet.
3) Be aware of the limitations and follow the guidelines in the document http://e-docs.bea.com/wls/docs81/jdbc/thirdparty.html#1043646 regarding security, error handling, releasing resources (close only the logical connection), etc.
Does this sound like the approach you had in mind?
Thanks again,
-Danyes.
Joe
>
Re: Obtaining an oracle.sql.STRUCT through a pooled JDBC connection
Posted: Jul 16, 2007 3:21 PM
dan schwemlein wrote:
Thanks for the quick response!I was working today...
Thank you for the information about the connection being closed.
I will look into using this configuration setting.
You say that you can describe a way to get a handle on an unwrapped
pool object using some documented WLS-specific code. Are you referring
here to the getVendorConnection() method?yes.
This method does not help me
get the oracle.sql.STRUCT object, because even the connection returned
by getVendorConnection() returns a wrapped WL java.sql.Struct object
from a call to getObject().I don't believe it. If you are running in WLS, with a local pool,
the getVendorConnection() will give you the Oracle connection,
which will give you an Oracle statement, etc, down to an oracle
STRUCT object. Once you have a direct reference to the oracle connection,
we're not in the picture when it returns something to you.
It would be great if getVendorObj() were
documented and could be counted on in future versions. To use this
method, one would still have to access it via Java reflection, because
the wrapper class and its getVendorObj() method would be exposed in an
API, correct? Could this method be exposed in the API, so that reflection
doesn't need to be used, or it is exposed somewhere that isn't documented?getVendorObj() is not yet exposed or therefore supported for the general
wrapped object, so you would have to start from the connection and
derive all subobjects from it.
Thanks again,
-Dan Schwemlein
Hello,
I am using WebLogic Server 10 and and Oracle 10 and I am trying to obtain a
vendor-specific oracle.sql.STRUCT from a ResultSet using a pooled connection
defined in Weblogic. I need the vendor-specific object, rather than simply
the java.sql.Struct implementation, because a third party library requires it.
What gets returned in the ResultSet is a non-exposed WebLogic wrapper object
which implements java.sql.Struct, but which cannot be cast to an oracle.sql.STRUCT.
I can use reflection on this object to find and call the getVendorObj() method to
obtain the oracle.sql.STRUCT, but this solution is not acceptable because this is
not a published API and is not guaranteed not to change in future versions.Understood. We all benefit from sticking to the J2EE standards,
but we could also wish Oracle had done so with it's driver objects.
I will assume your code is running in the WebLogic server, because
an external JVM can never access the real driver object, which will
always really be in the WLS JVM. No active JDBC object is serializable.
How can I reliably obtain a vendor-specific implementation of java.sql.Struct
through a WebLogic connection pool in WebLogic Server 10?There is no way to get a handle on an unwrapped pool object without using some
WLS-specific code, though I can describe a way with documented methods,
and/or I can get our documentation altered to say we'll support the
getVendorObj() method. We introspect every vendor object, and for those
implementations that have done the wise thing, projecting any non-standard
methods as an Interface, we are able to also project that Interface so
the vndor example code should work. However, in some poorly-done
cases, such as for some Oracle stuff, there is either no Interface,
or the Oracle code has extensions that take java.sql objects as input,
(at least that's the signature of the method) but two lines into the
method, the Oracle code assumes and casts the java.sql object to a concrete
Oracle object. In these use cases you need the direct unwrapped object.
We provide and document Connection.getVendorConnection(), and intend
getVendorObj() to serve the same for subobjects, but note the dangers
and responsibilities: We rely on our wrappers to implement the security
and thread-safety of our pooling system. Because user code can get
unrestricted access to the actual connection from most JDBC objects,
we can never trust that we have complete control once a vendor object
is exposed. Therefore, by default we will close and replace every JDBC
connection so exposed, as soon as the current thread is finished with
the pool connection. This hurts performance. We also document a pool
config setting that will tell us that you take responsibility for any such
problems, and not to close connections just because they've been exposed.
HTH,
Joe
Thanks for any advice,
-Dan Schwemlein

Max been in free pool ever exceeding

We are using Weblogic Server 6.1.In stateless ejb decriptor max-beans-in-free-pool is set as 10.Still during peak load condition beans in use count goes mre than 10(upto 100).Can anybody explain why?
Suyog

max-beans-in-cache does not apply to stateless session beans.
pooled beans are anonymous beans (ie without an assigned identity /
primary key)
cached beans are identified beans.
All stateless session beans are anonymous.
-- Rob
ali wrote:
>
can anybody tell what the difference between these two for stateless session
beans is?
thank you,
ali..

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I have a applicatio, which run on very different app servers (WebSpere, JRun and i-Planet)... the db conncetion problems existe whit server no-J2EE compliant, like as i-Planet.
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App in I'm work, make exhaustive use of db connection,
only on startup, use a average of 130 connection
request on less 10 secconds.
All connection requested, when finish to use, there
are closed, supposeddly, the closed connction are
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Normally a returned connection would just be inserted into a list with a possible state change. That would be very quick in java. It might check the state of the connection and that is going to take longer Another pool manager might do the same though.
then,
if pool is able to create emmergency connections (up
num max) always returned new connection, any one
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objects, app wait for free connection of pool... long
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RRAS 2012 With DHCP Works, Cannot Get Static Address Pool To Connect Completely

Hello Forums Users:
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the AD DHCP pool does?
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Bill:
Thanks for the reply.... yes, the idea is to free up a pool of IP's large enough to accomodate all 170 staff. Our current 192.168.2.x DHCP hands out 150, but I need to plan for DR/BCP when other locations (about 110 users) remote in when their
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Listener EA2: database connection pool and connection revalidation

Hi all,
As one can expect from early adopter release there could be some bugs but I can't find any references in forum to my situation:
* My 11g XE database and listener are starting as windows services when server boots operating system (Windows Server 2003 R2).
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     at oracle.dbtools.common.config.db.DatabaseConfig.getConnection(DatabaseConfig.java:68)
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     at oracle.dbtools.apex.ModApexContext.getConnection(ModApexContext.java:320)
     at oracle.dbtools.apex.Procedure.getProcedure(Procedure.java:166)
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* Oracle listener log for same time (no errors here):
30-NOV-2012 15:56:01 * (CONNECT_DATA=(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))(SERVICE_NAME=xe)(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1078)) * establish * xe * 0
30-NOV-2012 15:56:01 * (CONNECT_DATA=(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))(SERVICE_NAME=xe)(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1079)) * establish * xe * 0
30-NOV-2012 15:56:01 * (CONNECT_DATA=(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))(SERVICE_NAME=xe)(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1080)) * establish * xe * 0
30-NOV-2012 15:56:01 * (CONNECT_DATA=(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))(SERVICE_NAME=xe)(CID=(PROGRAM=JDBC Thin Client)(HOST=__jdbc__)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1081)) * establish * xe * 0
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Hi,
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Yes, TopLink allows you to use the app server's connection pooling and transaction services. Chapter 2 of the Oracle9iAS TopLink Foundation Library Guide provides details as do the TopLink examples. The easiest way to set this up is by using the sessions.xml file. The sample XML below is from the file <toplink903>\examples\ias\examples\ejb\sessionbean\sessions.xml. Here we are adding the datasource defined in OC4J and specifying that we are using the OC4J transaction controller also.
<login>
<user-name>sa</user-name>
<password></password>
<datasource>java:comp/env/jdbc/ejbJTSDataSource</datasource>
<uses-external-transaction-controller>true</uses-external-transaction-controller>
<uses-external-connection-pool>true</uses-external-connection-pool>
</login>
<external-transaction-controller-class>oracle.toplink.jts.oracle9i.Oracle9iJTSExternalTransactionController</external-transaction-controller-class>
When using this approach you need to change your TopLink code slightly in the EJB methods:
a. Acquire the ACTIVE unit of work from the server
session (again, see the EmployeeSessionEJB code
example) with something like:
UnitOfWork uow = clientSession.getActiveUnitOfWork();
b. Calls to uow.commit() can be ommitted or commented out
because the EJB will handle this. Note that of course
the methods you create in the EJB that are using this
approach must have TX Required (default).
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Number of connections in JSP with pool cache connection

I'm using a Bean from examples, its name: "ods", this is Pool Connection Cache, when a user start connection, this open 10 connections. In my project works 20 users, the DBA prefers don't use too many connections. The version of DB is 8.1.7 and web server 9iAS.
How do I do?
Can I use other number of connections by session?
What is the most rapid connection for work?
The instruction used is:
<jsp:useBean id="ods" class="oracle.jdbc.pool.OracleConnectionCacheImpl" scope="session" />
Thanks
MIGUEL ANGEL CARO
[email protected]

Hi,
Please repost your question in the J2EE forum. This forum is for Web Cache issues only. Sorry about the confusion.
We'll be changing the title of this forum soon to avoid mispostings.

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Free pooled db connections

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