ABAP MDM Connection Pool concept? Slow Performance in call

Hi,
I'm playing around with the MDM ABAP API, and I found the performance a bit disappointing.
I followed the guide "How To identify master data records using SAP MDM 5.5 ABAP API's" and wrote a test program.
The program makes a connection, triggers an MDM query, and disconnects.
    CREATE OBJECT api
      EXPORTING
        iv_log_object_name = logical_object_name.
    api->mo_accessor->connect( language ).
* Query parameters
    ls_query-parameter_code = 'Material_Number'.
    ls_query-operator = 'CS'.
    ls_query-dimension_type = 1.
    ls_query-constraint_type = 8.
    ls_value = '70'.
    GET REFERENCE OF ls_value INTO ls_query-value_low.
    APPEND ls_query TO lt_query.
    CLEAR ls_query.
* Search
    CALL METHOD api->mo_core_service->query
      EXPORTING
        iv_object_type_code = 'Products'
        it_query            = lt_query
        iv_hits_max         = 10
      IMPORTING
        et_result_set       = lt_result_set.
Connection is really fast (a split second)
First time triggered 'query' method took about 30-50 seconds.
Second time triggering 'query' method took a split second.
Further to my investigation, I found out the most expensive code lies in
CL_MDM_PROVIDER_SP04_PL03->IF_MDM_CORE_SERVICES~QUERY
*--- load field meta data ---*
IF mt_mdm_field_meta_data IS INITIAL
OR mt_field_meta_data     IS INITIAL.
    CALL METHOD me->_load_field_information.
ENDIF.
Within this method loadfield_information, it rips all the table and structure information
from MDM, and ALL language texts and so on.
It has many loops, and within the loops querying MDM for more information.
Is there anyway to speed this up?
Why aren't these data cached? (They don't change so often in a production environment)
I also found a shared memory class CL_MDM_METADATA_ACCESS but it is not used anywhere.
No shared memory area relevant is delivered by SAP as well.
Any ideas?
Cheers,
Michael.

Hi Michael,
you're welcome.
I'm not sure how the Connection Pooling to MDM is really done by the ABAP APIs as I'm unfortunately not an API developer but just use the API for my programms.
What I learned during this process is that the repository meta data (meaning table descriptions, and so on) have to be loaded at least once for each connection. This makes sense because a repository can always be changed manually by any user. And I don't think that it would be faster to hold the meta data persistent in the ABAP layer because then you would need to compare the ABAP available meta information with the current meta information of the repository. This could take even longer.
I've solved this "issue" in a way that I really rely on the connection because a single connection is very stable. So I call the "CONNECT" only once in the very beginning, run through my coding and the very last step is the "DISCONNECT". As long as a connection is available, the meta data is cached in the API layer (at least this is the case for SP05).
BR Michael

Similar Messages

ABAP MDM Connection Pool

Hi,
I'm trying to write a report that extracts information from MDM. Everytime it's called, it has to establish a new connection to MDM where the hand-shake takes about 20-30 secs.
I was wondering if ABAP MDM Connection Pooling exist.
In Java MDM, you can configure J2EE with connection pool, so that you can reuse a connection rather than re-establishing a new connection on every call.
I've read Thomas Jung's WIKI on "How do you implement a MDM Connection Help Class?", however I cannot reuse this class. The static attribute in the class is not persisted.
Did I do something wrong?
I tried turning it into a shared memory root class, however it complains about an object reference still exist and would not allow me to do "dettach_commit( )".
Don't know any other ways to store the connection handle in memory.
Export/Import, SPA/GPA are not OO friendly.
Cheers
Michael

Hi Andreas,
Thanks for your reply, it is good to confirm my understanding of the ABAP API connection.
For your interest, I have changed part of the connection code to increase the speed of the connection significantly.
Firstly to clarify, the connection from the ABAP stack to MDM is actually quite fast.
Upon the first call, the method CL_MDM_PROVIDER_SP04_PL03->_LOAD_FIELD_INFORMATION is called which reads the META-DATA from MDM for every table and every field. This could normally take 1 minute in our system landscape. I've changed to code to buffer the meta-data.
In a production/stable environment, it is unlikely for the META-DATA to change rapidly. Hence reading this on every connection is a waste of time.
This could be useful only if we are in implementation phase where this changes all the time.
1) In transaction MDMAPIC, I've added the ABAP implementation for MDM Version Support as my own MDM provider class ZSP04_PL03 with provider type ZCL_MDM_PROVIDER_SP04_PL03.
ZCL_MDM_PROVIDER_SP04_PL03 is a copy of CL_MDM_PROVIDER_SP04_PL03.
2) In ZCL_MDM_PROVIDER_SP04_PL03, the method LOADFIELD_INFORMATION is changed to read from buffer first before calling MDM. If the buffer is empty, it will read from MDM and store result into buffer etc.
I'm storing the information in a transparent table at the moment.
I buffer the three class attributes:
- mt_field_meta_data,
- mt_mdm_field_meta_data,
- mt_field_code2id_map.
As MT_FIELD_META_DATA is a complex structure (i.e. tables within table), I had to split it up into many different tables.
I can provide the code if you are interested.
Cheers,
Michael.

Connection pooling problem in web service call

Hi,
I want to create some REST web services which will be called frequently by other applications (making calls at each 4-5 seconds).
During the day there can be several instances active (20-30) which will use those web services. In conclusion there will be many database calls.
What's the best solution to avoid seeing JDBC connection failure in weblogic console and to use connection pooling properly?
1. Use createRootApplicationModule and after that call release
2. Get the datasource instance and after that do whatever business (get VOs, methods etc.)
...or there is another solution?
Thanks.
Edited by: DorinS on 03.11.2011 12:02

Hi,
If the POJO you use to expose the service stays in memory then you don't need to close the AM reference. However, what you really want to do is to use JDBC Datasources with your AM configuration so the server manages a pool of database connections the AM then reaches out to
Frank

Oracle.DataAccess 2.112.1.0 - Connection Pool Problem

Hi,
Oracle.DataAccess 2.112.1.0 is having connection pool problem. The no. of TCP connections to Oracle database keep increasing untill the server's session run out of limit. My application created connections, use them, close them, and dispose them properly. When using previous Oracle.DataAccess 2.111.6.20, the no. of TCP connections do not increase.
My database connection string has "Min Pool Size = 3 and Max Pool Size = 150".
With 2.111.6.20 version, TCP connection stays at 3.
With 2.112.1.0, TCP connection keep increasing for every 5 minutes. I've tried to disable Self Tuning, but still can't prevent the connections from increasing.
Later today, I downloaded Oracle.DataAccess 2.112.1.2 (it comes with ODAC 11.2.0.1.2) and test again, the problem is resolved... no more connection increases... but.... it is only for 32 bit Windows.
Unfortunately, there is no Oracle.DataAccess 2.112.1.2 for 64 bit Windows Server 2008.
May I know how can i resolve this problem on 64bit Window installed with Oracle 11g R2 client, which comes with Oracle.DataAccess 2.112.1.0, which has serious problems...(according to this 11.2 ODP.NET causing test runner failures )
Many thanks for your time and answers!
Edited by: user1502907 on 04-Sep-2010 23:01

Hi,
The only thing that jumps out within your problem description is that connections are being increased every 5 minutes. Are you sure its every 5 minutes and not 3 minutes which is the timing interval used by the Connection Pool facility to perform connection pool maintenance. If this occurs even when the application is idle then you could be running into the following known issue filed against 11.2.0.1.0 and fixed in 11.2.0.1.2.
Bug 9711600 - CONNECTIONS INCREASE BEYOND MAX POOL SIZE EVERY 3 MINUTE
This is specific to using the option CommandBehavior.CloseConnection when calling execute reader. Are you using this option and then also closing the connection in code before the datareader object is closed, if so you may be hitting this bug. You can also generate an ODP trace at level 15 of the behavior and if you see negative pool counts, that is also a diagnostic that points to this bug.
This is fixed in 11.2.0.1.0 Patch 3 or later for x64. If you have support, I recommend you open a service request to verify if this is your issue and if a patch set may help you.
Regards
Jenny B.

What is Connection Pooling

Hi Friends
What is "Connection Pooling"
I am developing Java Application using ms sql server 2000 database
Pl explain me about this
thanxinadvance
yours
Rajesh

In a basic DataSource implementation, there is a 1:1 correspondence between the
client�s Connection object and the physical database connection. When the
Connection object is closed, the physical connection is dropped. Thus, the
overhead of opening, initializing, and closing the physical connection is incurred for
each client session.
A connection pool solves this problem by maintaining a cache of physical database
connections that can be reused across client sessions. Connection pooling greatly
improves performance and scalability, particularly in a three-tier environment where
multiple clients can share a smaller number of physical database connections.
Nitin

Oracle: slow performance with SELECT using ojdbc14 and connection pooling

Hello,
i'm working hard the last days to solve a performance problem with our customer using a oracle 10g database. For testing I used our oracle 9.2.0.1.0 database which shows the same symptoms. All doing solved nothing: the performance while using this oracle is much slower than other databases. This result I cannot trust and so I need some advice. What is missing to improve the performance on the java side?
The webapplication I use runs fast on MySQL 4.x and SQLServer 2000, but on the above mentioned Oracle it was always 4 times slower. The webapplication uses a lot of simple SELECT-Statements without complicated joins and so on (because it should run on many different databases). Doing some days of creating tests within this webapplication, I was not able to find any entrance point for a change. All databases server I'm using, having only the default configurations after a common installation.
To reduce the complexity I wrote a simple java application with connection pooling using only the latest libraries from apache-commons(dbcp, pool), and the latest ojdbc14 for oracle 9.2.
First the results than the code: MySQL needed less than 1000 millisecond, SQLServer around 1000 milliseconds and Oracle over 2000 milliseconds. I stopped pooling and the results are for Oracle even worse: over 18000 milliseconds (mysql:2500, sqlserver:4100).
I changed the classes for Oracle and used the class oracle.jdbc.pool.OracleConnectionCacheImpl from the ojdbc14-library. No difference (around 100 milliseconds more or less).
The only Select-Statement works on this table, which has one index on HICTGID.
It contains 259 entrances.:
CREATE TABLE HIERARCHYCATEGORY (
HICTGID                 NUMBER (19)   NOT NULL,
HICTGLEVEL              NUMBER (10)   NOT NULL,
HICTGEXTID              NUMBER (19)   NOT NULL,
HICTGEXTPARENTID        NUMBER (19)   NOT NULL,
HICTGNAME               VARCHAR2(255) NOT NULL
);The application simply loops through this table using
SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?, but I always open a connection before this query and closes this connection afterwards. So I use the pooling as much as possible. That's all SQL I'm using.
    protected static DataSource setupDataSource(String sDriver, String sUrl, String sUser, String sPwd) throws SQLException {
        BasicDataSource ds = new BasicDataSource();
        ds.setDriverClassName(sDriver);
        ds.setUsername(sUser);
        ds.setPassword(sPwd);
        ds.setUrl(sUrl);
        // The maximum number of active connections:
        ds.setMaxActive(3);
        // The maximum number of active connections that can remain idle in the pool,
        // without extra ones being released, or zero for no limit:
        ds.setMaxIdle(3);
        // The maximum number of milliseconds that the pool will wait (when there are no available connections)
        // for a connection to be returned before throwing an exception, or -1 to wait indefinitely:
        ds.setMaxWait(3000);
        return ds;
    }I can switch by using external properties between three databases (oracle, mysql and sqlserver) and if I want I can switch pooling off. And all actions I'm interested are logged by Log4J.
    public static Connection getConnection() throws SQLException {
        Connection result = null;
        String sJdbcDriver = m_oJbProp.getString("jdbcDriver");
        String sJdbcUrl = m_oJbProp.getString("databaseConnection");
        String sJdbcUser = m_oJbProp.getString("dbUsername");
        String sJdbcPwd = m_oJbProp.getString("dbPassword");
            try {
                if (m_oJbProp.getString("useConnectionPooling").equals("true")) {
                     if (log.isDebugEnabled()) {
                          log.debug("ConnectionPooling true");
                    if(null == m_ds) {
                        m_ds = setupDataSource(sJdbcDriver,sJdbcUrl,sJdbcUser,sJdbcPwd);
                          if (log.isDebugEnabled()) {
                               log.debug("DataSource created");
                    result = m_ds.getConnection();
                } else {
                    // No connection pooling:
                     if (log.isDebugEnabled()) {
                          log.debug("ConnectionPooling false");
                    try {
                        Class.forName(sJdbcDriver);
                        result = DriverManager.getConnection(sJdbcUrl, sJdbcUser, sJdbcPwd);
                    } catch (ClassNotFoundException cnf) {
                        log.error("Exception: Class Not Found. ", cnf);
                        System.exit(0);
(.. ErrorHandling ...)Here is the code fragment which is doing the work:
                 StringBuffer sb = new StringBuffer();
            while (lNextBottom <= lNextCeiling) {
                 con = getConnection();
                 innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
                 innerSelStmt.setLong(1, lNextBottom);
                 rsInner = innerSelStmt.executeQuery();
                 if ((rsInner != null) && (rsInner.next())) {
                     sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
                      if (log.isDebugEnabled()) {
                           log.debug("Inner Statement: " + rsInner.getLong(1) + "\r");
                 rsInner.close();
                 con.close();
                 lNextBottom++;
             if (log.isInfoEnabled()) {
                  log.info("\rResult values: Hictgid, Hictgname \r");
                  log.info(sb.toString());
             }and the main method:
    public static void main(String[] args) {
        try {
             long lStartTime = System.currentTimeMillis();
             JdbcBasic oJb = new JdbcBasic();
             boolean bSuccess = false;
             bSuccess = oJb.getHierarchycategories();
             if (log.isInfoEnabled()) {
                  log.info("Running time: " + (System.currentTimeMillis() - lStartTime));
             if (null != m_ds) {
                 printDataSourceStats(m_ds);
                  shutdownDataSource(m_ds);
                  if (log.isInfoEnabled()) {
                       log.info("Datasource closed.");
         } catch (SQLException sqe) {
              log.error("SQLException within main-method", sqe);
    }My database values are
databaseConnection=jdbc:oracle:thin:@SERVERDB:1521:ora
jdbcDriver=oracle.jdbc.driver.OracleDriver
databaseConnection=jdbc:jtds:sqlserver://SERVERDB:1433/testdb
jdbcDriver=net.sourceforge.jtds.jdbc.Driver
databaseConnection=jdbc:mysql://localhost/testdb
jdbcDriver=com.mysql.jdbc.Driver
dbUsername=testusr
dbPassword=testpwdThanks for your reading and maybe for your help.

A few comments.
There is of course another difference between your test cases then just the database. There is also the driver. And I suspect that in at least the case with the jtds driver it is helping you along where you are doing something silly and the Oracle driver is not.
Before I explain the next part I would say the speed differences between MS-SQL and MySQL look about right I think you are aiming here for MS-SQL level performance not MySQL. (For a bunch of reasons MySQL is inherently faster but there are MANY drawbacks as well which have been well discussed on previous threads)
Here is where I believe your problem lies
while (lNextBottom <= lNextCeiling) {
                 con = getConnection();
                 innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
                 innerSelStmt.setLong(1, lNextBottom);
                 rsInner = innerSelStmt.executeQuery();
                 if ((rsInner != null) && (rsInner.next())) {
                     sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
                      if (log.isDebugEnabled()) {
                           log.debug("Inner Statement: " + rsInner.getLong(1) + "\r");
                 rsInner.close();
                 con.close();
                 lNextBottom++;
             }There at least four things that are wrong with above.
1) Why are you preparing the statement INSIDE the loop. Let us for a moment say that the loop will spin 100 times. That means that you are preparing the same statement 100 times. This is bad. It is also very relevant because for example the Jtds driver is going to be caching the prepared statements you make so that actually while you try and prepare it 100 times it only actually does it once... but in Oracle I don't know what it is doing for sure but if it is preparing on each pass well than that bit of it is going take 100 times longer then it should.
2) You are opening and closing the connection on each pass through the loop... also a terrible idea. You need to fix this first so that you can repeatedly use the same prepared statement.
3) Why are you looping in the first place? More on this later.
4) Where do you close the PreparedStatement? It doesn't look like you do.
Okay so for starters your loop should look a lot more like this...
code]
con = getConnection();
innerSelStmt = con.prepareStatement("SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID = ?");
while (lNextBottom <= lNextCeiling) {
innerSelStmt.setLong(1, lNextBottom);
rsInner = innerSelStmt.executeQuery();
if ((rsInner != null) && (rsInner.next())) {
sb.append(rsInner.getLong(1) + ", " + rsInner.getString(2) + "\r");
rsInner.close();
lNextBottom++;
innerSelStmt.close();
con.close();
I think the code above (and you can put your debug stuff back if you want) which uses ONE connection and ONE prepared Statement will improve your performance dramatically.
The other question though I would as is why in the hell you are doing 100 or whatever number of queries anyway. This can be done all in ONE query which again will improve performance.
Your query and such should look like this I think.
String sql = "SELECT Hictgid, Hictgname FROM HIERARCHYCATEGORY WHERE HICTGID >=? AND HICTGID<=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setLong(1,lNextBottom );
ps.setLong(2,lNextCeiling);
ResultSet rs = ps.executeQuery();
while(rs.next()){
// your appending to string buffer code goes here
}and I can't understand why you're not doing that in the first place.

performance CONNECTION POOLING BC4J

When Application was used by 80 users it work wery slow I think problem in CONNECTION POOLING
private Map m_pools;
public static final String[] APP_MODULE_NAMES = {
"StaffAppModule", "DossierAppModule", "ProcedureAppModule",
"ReportAppModule"
public static final String[] APP_MODULE_CONFIGURATION_NAMES = {
"StaffAppModuleLocal", "DossierAppModuleLocal",
"ProcedureAppModuleLocal", "ReportAppModuleLocal"
******* initialize pool START ********
m_pools = new HashMap();
PoolMgr mgr = PoolMgr.getInstance();
for (int i = 0; i < APP_MODULE_NAMES.length; i++) {
String poolName = APP_MODULE_NAMES[i] + "Pool";
ApplicationPool pool = mgr.findPool(poolName, PACKAGE,
APP_MODULE_CONFIGURATION_NAMES, null);
if (pool == null) {
pool = mgr.createPool(poolName, PACKAGE,
APP_MODULE_CONFIGURATION_NAMES[i], null);
m_pools.put(APP_MODULE_NAMES[i], pool);
******* initialize pool END ********
****** getAppModule START ***************
ApplicationPool pool = (ApplicationPool) m_pools.get(name);
log.debug("{ -- BusinessService ");
if (pool == null) {
return null;
SessionCookie sesCookie = pool.createSessionCookie(name,
IdFactory.createID(), null);
ApplicationModuleImpl appModule;
synchronized (this) {
log.debug("} -- synchronized ");
appModule = (ApplicationModuleImpl) sesCookie.useApplicationModule();
System.out.println("^^^ -- "+appModule.getClass());
appModule.setProperty(APP_MODULE_PROPERTY_SESSION_COOKIE, sesCookie);
return appModule;
****** getAppModule START ***************
<<< Can you help me performance CONNECTION POOLING ??? >>>

A Exception is thrown.

Low Application Performance due to AM connection pooling configuration

Hi All,
My application performance is too slow due to default App module connection pooling parameters. I started exploring on these parameters in oracle documentation and was stopped due to some doubts.
The below link is actually the one from which I'm doing the configuration.
http://docs.oracle.com/cd/E21764_01/web.1111/b31974/bcampool.htm
1. I want to know what value should be in Weblogic server --> Maximum capacity (I think they confused me a little saying it can be equal to AM's Maximum Pool Size, Maximum Available Size, Minimum Available Size).
2. Then the AM's Initial pool size should be equal to the weblogic's Initial Capacity. I have 10 AM, if I'm setting 100 in each AM, then the corresponding weblogic's initial capacity should be equal to 100 or 100 X 10. Please clarify this.
Thanks.

You post give no information which connects the pooling parameter to 'low' performance. Have you checked where all the time is consumed? Which method or part of the application consumes the most time. Before you can't answer these questions you can't link the problem to am pooling.
Here are some pointers
http://andrejusb.blogspot.de/2011/10/experimenting-with-adf-bc-application.html
http://andrejusb.blogspot.de/2012/01/adf-performance-marathon-22-hours.html
and there are some more articles available on Andrejus's blog...
Timo

So, about a week ago my macbook pro started having lots of issues: wifi connectivity, slow performance, sound issues, spotlight wasn't working. After going through the issues with apple support, they decided the best course of action was to erase it...

So, about a week ago my macbook pro started having lots of issues: wifi connectivity, slow performance, sound issues, spotlight wasn't working. After going through the issues with apple support, they decided the best course of action was to erase the hard drive and do a reinstall. Since I have a recent backup this seemed like a good enough option. They were kind enough to send me a copy of the snow leopard disk to do the install since we couldn't get it to complete through the disk utility. Not sure why, since it says we are fully connected, it just never completed.
Anyway, so now that you have the background here is the new issue. The macbook pro keeps spitting out the disk I'm trying to install from. Disk utility and using the 'Startup Disk' function from the apple menu doesn't read the disk.
Can anyone suggest a solution to this vexing problem?
Thanks in advance.

Jeremy.Laurin,
have you tried agb76’s approach here?

Connection pool performance

Barry,
You should post this to Performance newsgroups (please dont cross post)
This actually depends on how many execute threads you have - if you have 101
clients / applications requesting connections concurrently, only the once
that can get a Execute Thread will actually be able to use a connection and
complete. Rest of the application requests will be queued up.
sree
"Barry Myles" <[email protected]> wrote in message
news:40b47cdd$1@mktnews1...
>
Hi there I wonder if anyone could shine some light on the subject ofconnection
pooling configuration for me
In the connection pool If I have
initial capacity = 50
Maximum Capacity = 100
and then get a period with 101 concurrent applications all wanting towrite information
to the backend database at the same time, what happens to that oneapplication?
is it forced to wait until a thread becomes available, does it just blockuntil
this happens or does it give up right away? (if it does what exception
is generated if any?)
Also I'm trying to pin down some performance issues with the use ofconnection
pooling, can someone guide me as to what a typically under performingconfiguration
for a connection pool would be.

Javamail performance and connection pooling

Dear Javamail users and programmers,
I am new to javamail. We are working on a commercial web mail project and using Javamail to connect with an IMAP/SMTP clustered server group to read and write mails.
Our application will have 400000 concurrent users in the system and an Approximate , we will have 200 servers (Glassfish 3 ) and each server will have 2000 active users at time.
Now my problem! At the moment, we are opening the store each time we read or store mails for each user. I doubt this will have performance issues in production.
Does anyone have experience using Javamail in this dimension?
I read the connection pooling mechanism in the package com.sun.mail.imap Descriptio. If i understood correctly, this will require at-least one dedicated connection per user to the server . I think, that will be too many connections at a time for any Imap server cluster system.
Is there any other method of doing connection pooling?
Btw in which scenario I should increase the mail.imap.connectionpoolsize to more than one? I assume, i only need to increase this parameter if i want to keep more than one folder open for a particular user at time, isn't it?
What will be the best approach which suite to our application?
Thank you very much for any help.
With regards,
Alvin Antony

Connection pooling isn't likely to help in your scenario. IMAP connection pooling does not allow multiple
users to use the same connection to the server. Unless you want to map all of your web mail users to a
single IMAP user, connection pooling won't help you.
The general issue of managing sessions and connections was discussed briefly in this other thread:
[http://forums.sun.com/thread.jspa?threadID=5423307|http://forums.sun.com/thread.jspa?threadID=5423307]
I suspect you're going to need to do some experiments to determine the best approach.

Real slow performance on 100mbit connection with WRT320N

I noticed that 100mbit connections on the WRT320N perform realy bad. I tried a XBOX and a Aspire One laptop, both have 100mbit ethernet. Throughput is about 1-2 mbit/s.
If I put a gbit switch in between peformance is good - 80-90 mbit/s.
So:
100mbit xbox/aspire > wrt320N > gbitNAS = 1-2 mbit/s
100mbit xbox/aspire > gbit switch > wrt320N > gbitNAS = 90 mbit/s (nice!)
for reference: gbit pc > WRT320N > gbitNAS = 200mbit/s (NAS can't perform better)
I tried various duplex and speed settings on the Aspire (not possible on the XBOX) but that dit not help.
Can't find any option in the WRT230N to tweak the interfaces. Running the latest firmware avail on this site.
Anybody suggestions please?

Yesterday I got my Asus O!Play HDP-R1 player to replace my XBMC@XBOX. The Asus has a 100mbit ethernet port. I connected it to the WRT320N and I was almost sure it would have the same issue, but it did not. It streamed MKV and DVD files without any issues.
I googled a lot on this issue and found that a lot of people have this issue with the XBOX and other gigabit router/switches. The solution they found is to manual set the switchport to 100mbit full duplex. However this seems not possible on the WRT320N.
So I think this can be solved by finding the right driver for the 100mbit host (which I guess is a problem for the XBOX..)
Best would be to have a way to set the switchport to 100mbit full duplex. So I hope Linksys can add this feature, or can advise how to set somehow with the current firmware.

Has anyone run the connection pooling for mysql & tomcat successfully?

I'm trying to set up connection pooling. I'm following the how-to page at
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
But when i test the DBTest/test.jsp file, tomcat displays an error =
could not load jdbc driver class 'null'(msdos)
i have placed all the required .jar files in the tomcat lib.
below is the cofiguration i did to the server.xml file



<Server port="8005" shutdown="SHUTDOWN" debug="0">

<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"
debug="0"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
debug="0"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>


<Service name="Tomcat-Standalone">


<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="100" debug="0" connectionTimeout="20000"
useURIValidationHack="false" disableUploadTimeout="true" />




<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8009" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="20000"
useURIValidationHack="false"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>











<Engine name="Standalone" defaultHost="localhost" debug="0">



<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>


<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
debug="0" resourceName="UserDatabase"/>







<Host name="localhost" debug="0" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<Context path="/my-jsp" docBase="c:\JSP-Files" debug="0"
privileged="true" reloadable="true" />
     <Context path="" docBase="c:\Inetpub\wwwroot" debug="0" privileged="true" />
<Context path="/sharon" docBase="C:\Tomcat 4.1\webapps\sharon" debug="0" privileged="true" />





<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="localhost_log." suffix=".txt"
     timestamp="true"/>




<Context path="/examples" docBase="examples" debug="0"
reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Ejb name="ejb/EmplRecord" type="Entity"
home="com.wombat.empl.EmployeeRecordHome"
remote="com.wombat.empl.EmployeeRecord"/>



          
<Environment name="maxExemptions" type="java.lang.Integer"
value="15"/>
<Parameter name="context.param.name" value="context.param.value"
override="false"/>
<Resource name="jdbc/EmployeeAppDb" auth="SERVLET"
type="javax.sql.DataSource"/>
<Resource name="jdbc/TestDB"
     auth="Container"
     type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
     <name>factory</name>
     <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
     </parameter>
     
     <parameter>
     <name>maxActive</name>
     <value>100</value>
     </parameter>
     
     <parameter>
     <name>maxIdle</name>
     <value>30</value>
     </parameter>
     
     <parameter>
     <name>maxWait</name>
     <value>10000</value>
     </parameter>

<parameter>
<name>user</name>
<value>javauser</value>
</parameter>
<parameter>
<name>password</name>
<value>javadude</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>

     <parameter>
     <name>url</name>
     <value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
<Resource name="mail/Session" auth="Container"
type="javax.mail.Session"/>
<ResourceParams name="mail/Session">
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
<ResourceLink name="linkToGlobalResource"
global="simpleValue"
type="java.lang.Integer"/>
</Context>
</Host>
</Engine>
</Service>



</Server>
Pleas4 help!!!

you have your driver jar in Tomcat\common\lib?
if so, check your classpath, it could be that.

Connection Pooling in Portal?..Can we do that?

Hi to all.
Not sure if this the correct forum to ask, but maybe anybody have any ideas..
We have a problem.
We are using Oracle Portal R2 9.0.2.0.1.
The case is, we found out that the most of the database connection we create while using JSP Portlet, didn't closed...
and the result, maybe it makes our Portal performance slow..
So, we have to use Connection Pooling in the Portal.
How can we do that, and can we do that in Oracle Portal?
Thanks.

If you created the connections you should explicitly close them also.
Are you doing that ?

Excessive connection latency... Does Adobe Air support connection pooling on mobile?

Hello,
I am developing a mobile app which loads thumbnail images from a remote server. During testing on the Android platform, however, I have discovered that images are very slow to load. By monitoring server logs I have determined that the poor performance is caused by the lack of connection pooling, meaning that each request builds a new connection. Running the sample code below on a mobile device produces 20 requests and 20 connection attempts. By comparison, the same web or desktop app creates 2 connections and reuses those connections for subsequent requests. The substantial overhead and latency associated with generating new connections has a substantial affect on performance, with 20 thumbnails taking approximately 4-5 seconds to load on mobile versus 0.5 - 1 second on a desktop.
I have included a sample app below to emphasis the performance issue. The image itself is very small (290 bytes) to focus the issue on connection latency. I have confirmed this behavior on numerous Android devices, running 4.1, 4.0, and 2.3. I have also attempted using Loader v. URLLoader v. URLStream and sequential v. simultaneous loading with no change in connection behavior. Attempting to set the connection to 'keep-alive' in the URLRequest also has no affect.
package
          import flash.display.Loader;
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.events.Event;
          import flash.net.URLRequest;
          import flash.utils.getTimer;
          public class Main extends Sprite
                    private var _count:int = 0;
                    public function Main()
                              super();
                              stage.align = StageAlign.TOP_LEFT;
                              stage.scaleMode = StageScaleMode.NO_SCALE;
                              trace("Start time " + getTimer() + " ms");
                              var loader:Loader;
                              var url:String = "http://fbcdn-profile-a.akamaihd.net/static-ak/rsrc.php/v2/yo/r/UlIqmHJn-SK.gif"; // 290 bytes
                              for (var i:int = 0; i < 20; i++) {
                                        loader = this.addChild(new Loader()) as Loader;
                                        loader.contentLoaderInfo.addEventListener(Event.COMPLETE, complete);
                                        loader.load(new URLRequest(url));
                    private function complete(event:Event):void
                              _count++
                              trace("Finished " + _count + " at " + getTimer() + " ms");
So, I have a couple questions:
1) Is there something that I can do to enable connection reuse?
2) Is this an inherent limitation with Adobe Air for mobile?
3) Can someone confirm whether this limitation exists on other mobile platforms (iOS or Blackberry)?
Any help that you can provide would be greatly appreciated. I am really hoping that this isn't a fundamental limitation of Adobe Air as it causes my app to feel very sluggish.
Thanks,
Adam

Hmm. You were absolutely correct, that's a bit disappointing!
This is Android recompiled for 3.4 rather than 3.1.
null
COMPLETED 50 with 8 loaders in 11327 milliseconds or 226.54 per load.   50           8              11327    226.54
COMPLETED 50 with 50 loaders in 8899 milliseconds or 177.98 per load.   50           50           8899       177.98
COMPLETED 50 with 50 loaders in 9280 milliseconds or 185.6 per load.     50           50           9280       185.6
COMPLETED 50 with 50 loaders in 9513 milliseconds or 190.26 per load.   50           50           9513       190.26
COMPLETED 50 with 8 loaders in 9744 milliseconds or 194.88 per load.     50           8              9744       194.88
COMPLETED 50 with 1 loaders in 16383 milliseconds or 327.66 per load.   50           1              16383    327.66
Versus Apple iPad recompiled for 3.4 rather than 3.1.
null
COMPLETED 50 with 8 loaders in 502 milliseconds or 10.04 per load. 50      8        502    10.04
COMPLETED 50 with 50 loaders in 100 milliseconds or 2 per load.     50      50      100    2
COMPLETED 50 with 50 loaders in 117 milliseconds or 2.34 per load. 50      50      117    2.34
COMPLETED 50 with 50 loaders in 93 milliseconds or 1.86 per load. 50      50      93      1.86
COMPLETED 50 with 8 loaders in 270 milliseconds or 5.4 per load.    50      8        270    5.4
COMPLETED 50 with 8 loaders in 307 milliseconds or 6.14 per load. 50      8        307    6.14
COMPLETED 50 with 8 loaders in 316 milliseconds or 6.32 per load. 50      8        316    6.32
COMPLETED 50 with 4 loaders in 555 milliseconds or 11.1 per load. 50      4        555    11.1
COMPLETED 50 with 4 loaders in 547 milliseconds or 10.94 per load. 50      4        547    10.94
COMPLETED 50 with 4 loaders in 535 milliseconds or 10.7 per load. 50      4        535    10.7
COMPLETED 50 with 2 loaders in 1038 milliseconds or 20.76 per load.        50      2        1038          20.76
COMPLETED 50 with 2 loaders in 1042 milliseconds or 20.84 per load.        50      2        1042          20.84
COMPLETED 50 with 1 loaders in 2107 milliseconds or 42.14 per load.        50      1        2107          42.14
COMPLETED 50 with 1 loaders in 2099 milliseconds or 41.98 per load.        50      1        2099          41.98
Both are on release compile, which should take out all of the variability. So, yes, it looks as if the 3.4 AIR runtime has lost the connection pooling but ONLY for Android.
PS: Code I used in my test (which was a conventional View based Mobile app) is below in case you want to include it when you submit a bug report.
<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" title="TestLLatency" xmlns:mx="library://ns.adobe.com/flex/mx">
<fx:Script>
<![CDATA[
   import mx.events.FlexEvent;
   protected function uicomponent1_creationCompleteHandler(event:FlexEvent):void
    startTest();
   public function startTest():void {
    if(queue) throw new Error("Please wait for previous test to end.");
    queue = new Array();
    _count = 0;
    var loader:Loader;
    var i:int;
    for (i = 0; i < numToQueue; i++) {
     loader = bob.addChild(new Loader()) as Loader;
     loader.x = (i%10)*50;
     loader.y = Math.floor(i/5)*50;
     loader.contentLoaderInfo.addEventListener(Event.COMPLETE, complete);
     queue.push(loader);
    startTime = getTimer();
    for(i=0;i<numLoaders;i++) {
     nextQueue();
   protected var startTime:int;
   protected var endTime:int;
   protected var numToQueue:int = 50;
   protected var numLoaders:int = 8;
   protected var queue:Array;
   private var _count:int;
   private function complete(event:Event):void
    _count++
    nextQueue();
   [Bindable] protected var results:String;
   protected function nextQueue():void {
    var url:String = "http://fbcdn-profile-a.akamaihd.net/static-ak/rsrc.php/v2/yo/r/UlIqmHJn-SK.gif"; // 290 bytes
    if(queue && queue.length) {
     var loader:Loader = queue.pop() as Loader;
     loader.load(new URLRequest(url));
    } else if(_count==numToQueue) {
     endTime = getTimer();
     var elapsed:int = endTime-startTime;
     results += "\n"+("COMPLETED "+numToQueue+" with "+numLoaders+" loaders in "+(elapsed)+" milliseconds or "+(elapsed/numToQueue)+" per load.\t"+[numToQueue,numLoaders,elapsed,elapsed/numToQueue].join("\t"));
     queue = null;
     while(bob.numChildren>5) {
      bob.removeChildAt(bob.numChildren-1);
     bob.getChildAt(0).addEventListener(MouseEvent.CLICK,repeatTest);
     bob.getChildAt(1).addEventListener(MouseEvent.CLICK,repeatTest);
     bob.getChildAt(2).addEventListener(MouseEvent.CLICK,repeatTest);
     bob.getChildAt(3).addEventListener(MouseEvent.CLICK,repeatTest);
     bob.getChildAt(4).addEventListener(MouseEvent.CLICK,repeatTest);
   protected function repeatTest(event:MouseEvent):void {
    var dob:DisplayObject = event.target as DisplayObject;
    var testBehaviour:int = dob.parent.getChildIndex(dob);
    try {
     switch(testBehaviour) {
      case 4 :
       this.numLoaders = this.numToQueue;
       break;
      case 3 :
       this.numLoaders = 8;
       break;
      case 2 :
       this.numLoaders = 4;
       break;
      case 1 :
       this.numLoaders = 2;
       break;
      case 0 :
       this.numLoaders = 1;
       break;
     startTest();
     dob.removeEventListener(MouseEvent.CLICK,repeatTest);
     for(var i:int=0;i<5;i++) bob.removeChildAt(0);
    } catch(e:Error) {
     trace(e.message);
]]>
</fx:Script>
<fx:Declarations>

</fx:Declarations>
<s:HGroup width="100%" height="100%">
<mx:UIComponent id="bob" width="100%" height="100%" creationComplete="uicomponent1_creationCompleteHandler(event)" />
<s:TextArea text="{results}" width="100%" height="100%" />
</s:HGroup>
</s:View>

ABAP MDM Connection Pool concept? Slow Performance in call

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