How to manage connections in production environment

Hai
We are using Statless Session beans which will call bean managed entity beans
as a developer we completed the first phase of our project successful but when
comming to the production environment they(Higher authoritites of the company)
are asking abt the connection pools. Suppose if my wlserver5.1 has 100 hits per
a second how many connection pools i need to put in the production envirornment
and also is it the right way to increase the connectionpools depends upon the
clients hits????. Can anybody help me regarding this It is very urgent for us.
Thanks in advance
Cheers Kiran Nallam

Hi,
It all depends on your infrastructure and what products you are using.
In most cases dev/prod are on different servers and are separate installs, this is the route I would promote.
Some clients do share an environment for dev/test but not all, not everybody is the same.
Cheers
John
http://john-goodwin.blogspot.com/

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http://john-goodwin.blogspot.com/

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Stale Database Connections in Production Environment - Oracle 9.0.4.1

Every so often we encounter stale database connections in our connection pools. To us, this should not happen, as the connections should be refreshed, if idle, every so often.
Please see the data-sources entry below for an example connection pool. They are all pretty much the same. We have a retry-interval and inactivity-timeout specified!
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conn.setAutoCommit(false);
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logger.fatal("Borrow connection failed");
throw new SQLException();
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How to manage connections good?

Hi there;
When calling a servlet from another servlet what must we do?(both servlet uses database connection)
1)do we must pass the connection to the second servlet as an object?
2)or do we must close the connection before calling second servlet and open new connection on the second servlet?
i am using jndi-dbcp connection pooling...closing then creating connections are expensive in connection pooling?
thanks for any suggestions
Burak

the common servlet called by many servlets...think
that common servlet controls the session,if the user
has logged in or not...and must be called by many
servlets...That's one way to do it, but it's hardly optimal.
now what we gonna do?are we going to embed that
common code to every object?this is now code
repeatation...!Repeating yourself is indeed a bad thing, but you've something that ought not be done in servlets, IMO. That's not what they're for.
Connections should be maintained in a pool by the servlet container. They most definitely should NOT be passed around on the wire. That's just wrong.
Are all these servlets in the same web context?
so what is the solution for commonly used codes?Don't put JDBC code in servlets.
I'd have service interfaces that were responsible for performing actions on the behalf of clients. The service takes objects bound from the HTTP request and uses them, along with model objects and Data Access Objects, to fulfill the request. The service knows about units of work, so it worries about getting Connections out of the pool and passing them to its DAOs. It manages transactional logic and returns the connection to the pool when it's done.
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I am not able to resolve the error of
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Hi Surbhi.Gupta,
Thank you for posting in MSND forum.
According to your descriptiom, I suggest you could try the following blog to connect to Oracle from Visual Studio check your issue again.
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How to use connection pools in production environment

Hai
We are using Statless Session beans which will call bean managed entity beans
as a developer we completed the first phase of our project successful but when
comming to the production environment they(Higher authoritites of the company)
are asking abt the connection pools. Suppose if my wlserver5.1 has 100 hits per
a second how many connection pools i need to put in the production envirornment
and also is it the right way to increase the connectionpools depends upon the
clients hits????. Can anybody help me regarding this It is very urgent for us.
Cheers Kiran Nallam

Hi Aravind,
It can be used only for calculation kinda "minimum size".
Nothing can prevent a developer from writing something
like this:
Connection con1 = ds.getConnection();
Connection con2 = ds.getConnection();
Connection con3 = ds.getConnection();
Regards,
Slava Imeshev
"Aravind Krishnasamy" <[email protected]> wrote in message news:3bfa85f6
You can fix the size of the weblogic connection pool depending on yourexecute
thread count value. For example the default value of execute thread countvalue
is 15. So at a given point of time you cannot use more then 15 databaseconnection.
Database connection pool size should be equal to or less then the size ofexecute
thread count
"Slava Imeshev" <[email protected]> wrote:
Hi Kiran,
It's hard to provide exact dependence between number of hits
and actual number of consumed connections because it's a highly
variable distributed environment. But the general approach is
simple - before rolling out your application, make sure you
tested it under simulated peak load. Your connection pool should
have enough connections to serve peak load. Without such a testing
you will never know whether your app scales or not.
Regards,
Slava Imeshev
"Kiran" <[email protected]> wrote in message
news:3bf9d676$[email protected]..
Hai
We are using Statless Session beans which will call bean managed entitybeans
as a developer we completed the first phase of our project successfulbut
when
comming to the production environment they(Higher authoritites of thecompany)
are asking abt the connection pools. Suppose if my wlserver5.1 has100
hits per
a second how many connection pools i need to put in the productionenvirornment
and also is it the right way to increase the connectionpools dependsupon
the
clients hits????. Can anybody help me regarding this It is very urgentfor
us.
Cheers Kiran Nallam

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How to manage database connections

Hi, I have been trying to find the best way of doing database connections, My application will not be used by many users since its an intranet application used by administrators only to change settings.
I want to be able to connect to db from a servlet but not have to make the connection all the time, I was thinking of creating my own ContinuousConnection class which basically keeps the connection and all you do is getConnection which checks if the connection is "up" or not, if it is up then just give it as the return value else, just create a new connection since the driver class has already been loaded...if it is null then just load the driver and make the connection.
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Add something like this to the server.xml file:
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              <value>xxxxx</value>
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            <parameter>
              <name>removeAbandoned</name>
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            </parameter>
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        </Context> This needs to go in between the <Host> ... </Host> tags (probably at the bottom) in the server.xml file (${CATALINA_HOME}/conf). You must put this in the correct place in the xml file or you'll get errors.
Then you need to add this to your web.xml file:
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Then to get a connection:
final Context initContext = new InitialContext();
final DataSource ds = (DataSource) initContext.lookup("java:/comp/env/jdbc/ORAC");
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How Transaction Manager work with Resource Manager, like Connection pool?

hi,
I'm using BEA Webloigc8.1 Stateless Session Bean/DAO/Oracle stored proc.
but I'm not quite clear how Transaction Manager work with Resource Manager, like Connection pool.
my understanding is that, in a weblogic transaction, a stateless session bean interact with several DAOs, and for each method of DAO a connection is acquired from connection pool. I've heard that the connection will not return to pool until the transaction commits.
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any help appreciated!

Xin Zhuang wrote:
hi,
I'm using BEA Webloigc8.1 Stateless Session Bean/DAO/Oracle stored proc.
but I'm not quite clear how Transaction Manager work with Resource Manager, like Connection pool.
my understanding is that, in a weblogic transaction, a stateless session bean interact with several DAOs, and for each method of DAO a connection is acquired from connection pool. I've heard that the connection will not return to pool until the transaction commits.
My question is that, does it mean that for a weblogic transaction, multiple connections might be allocated to it? and if multiple connections are allocated, then how many oracle transactions would be started? or multiple connections share the same oracle transaction?
I didn't feel it make sense to start multiple oracle transactions, cause deadlock might be incurred in a single weblogic transaction.
any help appreciated!Hi. If you configure your WLS DataSource to use keep a connection for
the duration of a tx, it will do that, and in any case there can be
no deadlock however many connections operate for a given XA transaction.
Here is the best coding form for DAOs or any other user-written code
for using WebLogic DataSources. This is important for two reasons:
1 - Thread-safety is maintained as long as the connection is a
method-level object.
2 - It is crucial to notify WebLogic that you are done with a connection
ASAP, by your calling close() on it. We will then put it back in the
pool, or keep it under the covers for your next request if it's in a
transaction etc. The pool is optimized for quick get-use-close scenarios.
public void one_of_my_main_JDBC_Methods()
Connection con=null; // Must be a method level object for thread-safety
// It will be closed by the end of the method.
try {
con = myDataSource.getConnection(); // Get the connection in the try
// block, directly from the WebLogic
// datasource
// do all the JDBC within this try block. You can pass the
// connection to subordinate methods, but not to anywhere
// that thinks it can use the connection later.
rs.close(); // close any result set asap
stmt.close(); // then close any statement asap
// When you're done with JDBC
con.close(); // close the connection asap
con = null; // nullify it so the finally knows it's done
catch (Exception e) {
// do whatever catch stuff you want. You don't
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finally {
// It is important to close a JDBC connection ASAP when it's not needed.
// without fail, and regardless of exit path. Do everything in your
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try { if (con != null) con.close();} catch (Exception ignore){}
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How to manage connections in production environment

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