RH Linux and AQ performance problem

I am running RH Linux 7.1 with Oracle 8.1.7. My web application
works fine until a specific point when I begin using AQ. Part of
the AQ initialization in my application is to create 8 DB
connections which pole the DB every 500 ms. These connections
cause the web application to begin processing extremely slowly
(about 30 seconds between pages). There has been a proposal that
this might be due to a Linux threading issue. Any ideas?
As a side note, I first noticed the problem after recreating a DB
with the JServer option included (as I am writing Java stored
procedures too). To eliminate this from concern I have executed
jvmrm.sql to remove the java classes in the database. My
original problems continues to exist.
Thanks,
David

I am assuming you are polling the database for messages in
queues to be dequeued every few seconds on these eigh
connections.
Suggestions -
a) why don't use notification mechanism and let the database
tell you if there is a message for you to dequeue.
b) why do you need eight connections?

Similar Messages

Numbers Import and Load Performance Problems

Some initial results of converting a single 1.9MB Excel spreadsheet to Numbers:
_Results using Numbers v1.0_
Import 1.9MB Excel spreadsheet into Numbers: 7 minutes 3.5 seconds
Load (saved) Numbers spreadsheet (2.4MB): 5 minutes 11.7 seconds
_Results using Numbers v1.0.1_
Import 1.9MB Excel spreadsheet into Numbers: 6 minutes 36.1 seconds
Load (saved) Numbers spreadsheet (2.4MB): 5 minutes 5.8 seconds
_Comparison to Excel_
Excel loads the original 1.9MB spreadsheet in 4.2 seconds.
Summary
Numbers v1.0 and v1.0.1 exhibit severe performance problems with loading (of it's own files) and importing of Excel V.x files.

Hello
It seems that you missed a detail.
When a Numbers document is 1.9MB on disk, it may be a 7 or 8 MB file to load.
A Numbers document s not a file but a package which is a disguised folder.
The document itself is described in an WML extremely verbose file stored in a gzip archive.
Opening such a document starts with an unpack sequence which is a fast one (except maybe if the space available on the support is short).
The unpacked file may easily be 10 times larger than the packed one.
Just an example, the xml.gz file containing the report of my bank operations for 2007 is a 300Kb one but the expanded one, the one which Numers must read, is a 4 MB one, yes 13,3 times the original.
And, loading it is not sufficient, this huge file must be "interpreted" to build the display.
As it is very long, Apple treats it as the TRUE description of the document and so, each time it must display something, it must work as the interpreters that old users like me knew when they used the Basic available in Apple // machines.
Addind a supplemetary stage would have add time to the opening sequence but would have fasten the usage of the document.
Of course, it would also had added a supplementary stage duringthe save it process.
I hope that they will adopt this scheme but of course I don't know if they will do that.
Of course, the problem is quite the same when we import a document from Excel or from AppleWorks.
The app reads the original which is stored in a compact shape then it deciphers it to create the XML code. Optimisation would perhaps reduce a bit these tasks but it will continue to be a time consuming one.
Yvan KOENIG (from FRANCE dimanche 27 janvier 2008 16:46:12)

OmniPortlet, Linux and graphs a problem?

I have the OmniPortlet working under Linux and made a tab report against emp. Worked fine.
I then set the style to chart instead. Now I cant press OK on the portlet definition page or edit or view the page. I just get "Internal server error".
In the portalTools application log file i get:
at com.evermind[Oracle9iAS (9.0.2.0.0) Containers for J2EE].util.ThreadP
oolThread.run(ThreadPoolThread.java:64)
10/17/03 2:39 PM omniPortlet: [id=1066394357837ApplicationServerThread, instance
=114401_OMNIPORTLET_387111] JDBCUtils.getMetadata QueryStringAfterParamSubstitut
ion=select * from scott.emp
10/17/03 2:39 PM omniPortlet: [id=(null), instance=(null)] WARNING: Request has
exceeded its warning timeout of 20000ms. Request details are: id=1066394357837Ap
plicationServerThread providerId=387111 portletId=100 portletName=OmniPortlet po
rtletInstance=114401_OMNIPORTLET_387111 user=PORTAL
10/17/03 2:40 PM omniPortlet: [id=(null), instance=(null)] ERROR: Request has ex
ceeded the kill timeout of 80000ms - trying to interrupt the request, request de
tails are: id=1066394357837ApplicationServerThread providerId=387111 portletId=1
00 portletName=OmniPortlet portletInstance=114401_OMNIPORTLET_387111 user=PORTAL
In the portal application log file there are lots of these:
10/17/03 2:34 PM portal: FetchGroup caught uncaughtException=java.lang.ThreadDea
th in thread name=content-fetcher40, starting a new fetcher. 27 total threads in
this group. Parent Groups : applicationServerThreadGroup=76, main=114, system=1
20, end.
10/17/03 2:40 PM portal: id=1066394357837ApplicationServerThread Stall Timeout r
eached. Interrupting Fetcher name=content-fetcher48 label=webPortlet url=http://
ska57.data.skanska.se:7778/portalTools/omniPortlet/providers/omniPortlet time=51
260ms timeout=51000ms process=Dispatching
10/17/03 2:40 PM portal: HeartBeat retrying to stop a Fetcher name=content-fetch
er48 timeout=51000ms process=Dispatching
10/17/03 2:40 PM portal: FetchGroup caught uncaughtException=java.lang.ThreadDea
th in thread name=content-fetcher48, starting a new fetcher. 27 total threads in
this group. Parent Groups : applicationServerThreadGroup=76, main=114, system=1
20, end.
Any ideas?
I believe I hav DISPLAY set up right in the right conf-files (but who nows)...
Kind regards
Tomas Albinsson
Stockholm, Sweden

Sorry for the delay, I couldn't access the server any sooner.
Which version of OmniPortlet are you using ?Version: 9.0.2.6.1 June 27 2003
In the config page it says that DISPLAY is not configured.
I've set it for OC4J_Portal in $MID_HOME/opmn/conf/opmn.xml. I've also set it in $MID_HOME/portal/902dcm/opmn.xml and in $MID_HOME/portal/9023dcm/opmn.xml.
I ran dcmctl updateConfig and restarted the midtier but it's still "not configured" in the config page.
The application.log also complain about the DISPLAY not being set.
Any suggestions? Are there other files?
My sysadmin has said DISPLAY should be localhost:1.0
The data is just ename and salary from scott.emp but it must be the DISPLAY that's causing my problems.
Tomas

Macbook cpu problem extreme frequent slowdown and subs performance problems

Hello
Since summer 2007 we have been experiencing speed problems with one of our Macs a Macbook bought in 2006. Initially we thought it was just because we were asking too much of the computer. But unfortunately this is not the case. What happens is that while working normally (normal performance) with one or more applications, the computer starts to slow down to a near halt. You notice this because instead of for example opening a new window right away it slowly unrolls the window until it is open. At the same time the fan starts to accelerate and often the little color wheel appears instead of the mouse arrow. The computer is warm but not hot. Usually after a while the speed of the computer comes back to normal and the fan will stop turning at high speed. When checking cpu usage during such an "episode" most of the time cpu usage by Safari or Firefox Activity monitor indicates cpu usage by Safari and Firefox 100-110 % which strikes me as not being right . Quitting these programs seems (seems !) to return the computer to normal faster. The Apple store has replaced the memory, no effect, I did a total clean install of OS, updated it to the latest version of Tiger no effect. What can be the problem ? Is it the logic board as a whole or the graphics portion ? Or is something blocking the vent and it does not cool sufficiently? We are at a loss what to do.
Any advise would be appreciated. Right now all I can think of is to bring the computer in to an Apple Care Center probably resulting in a high bill even though in retrospect this problem started before the expiry of the Apple warranty.
Many thanks for any help.
H van Es

nlesh wrote:
Hello thanks,
We use websites like Wall Street Journal online, viamichelin.fr, yahoo, NCBI. I may have given the wrong impression that it only happens with internet use, it also happens with iMovie or Nikon capture NX but I guess we just notice it more with internet use because this computer is mostly used for that plus e-mail.
H van Es
I took a look at those sites. I noticed several ad/content displays on online.wsj.com which probably used Flash or Java animation/video. Yahoo! typically has tons of animation features (especially stuff like falling snow on holidays), and viamichelin.fr has a bunch of animated ads. NBCI looks to be the nastiest of the bunch.
If your fan is turning on from having multiple websites like those on, I'm not surprised.

Performance Problem - MS SQL 2K and PreparedStatement

Hi all
I am using MS SQL 2k and used PreparedStatement to retrieve data. There is strange and serious performance problem when the PreparedStatement contains "?" and using PreparedStatement.setX() functions to set its value. I have performed the test with the following code.
for (int i = 0; i < 10; i ++) {
try {
con = DBConnection.getInstance();
statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = '" + cardNo + "'");
// statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = ?");
// statement.setString(1, cardNo);
rs = statement.executeQuery();
if (rs.next()) {
catch(SQLException e) {
e.printStackTrace();
finally {
try {
rs.close();
statement.close();
catch(SQLException e) {
e.printStackTrace();
Iteration Time (ms)
1 961
10 1061
200 1803
for (int i = 0; i < 10; i ++) {
try {
con = DBConnection.getInstance();
// statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = '" + cardNo + "'");
statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = ?");
statement.setString(1, cardNo);
rs = statement.executeQuery();
if (rs.next()) {
catch(SQLException e) {
e.printStackTrace();
finally {
try {
rs.close();
statement.close();
catch(SQLException e) {
e.printStackTrace();
Iteration Time (ms)
1 1171
10 2754
100 18817
200 36443
The above test is performed with DataDirect JDBC 3.0 driver. The one uses ? and setString functions take much longer to execute, which supposed to be faster because of precompilation of the statement.
I have tried different drivers - the one provided by MS, data direct and Sprinta JDBC drivers but all suffer the same problem in different extent. So, I am wondering if MS SQL doesn't support for precompiled statement and no matter what JDBC driver I used I am still having the performance problem. If so, many O/R mappings cannot be used because I believe most of them if not all use the precompiled statement.
Best regards
Edmond

Edmond,
Most JDBC drivers for MS SQL (and I think this includes all the drivers you tested) use sp_executesql to execute PreparedStatements. This is a pretty good solution as the driver doesn't have to keep any information about the PreparedStatement locally, the server takes care of all the precompiling and caching. And if the statement isn't already precompiled, this is also taken care of transparently by SQL Server.
The problem with this approach is that all names in the query must be fully qualified. This means that the driver has to parse the query you are submitting and make all names fully qualified (by prepending a db name and schema). This is why creating a PreparedStatement takes so much using these drivers (and why it does so every time you create it, even though it's the same PreparedStatement).
However, the speed advantage of PreparedStatements only becomes visible if you reuse the statement a lot of times.
As about why the PreparedStatement with no placeholder is much faster, I think is because of internal optimisations (maybe the statement is run as a plain statement (?) ).
As a conclusion, if you can reuse the same PreparedStatement, then the performance hit is not so high. Just ignore it. However, if the PreparedStatement is created each time and only used a few times, then you might have a performance issue. In this case I would recommend you try out the jTDS driver ( http://jtds.sourceforge.net ), which uses a completely different approach: temporary stored procedures are created for PreparedStatements. This means that no parsing is done by the driver and PreparedStatement caching is possible (i.e. the next time you are preparing the same statement it will take much less as the previously submitted procedure will be reused).
Alin.

Missing data in server monitor under linux and solaris

Some metrics are not displayed in our environments, specifically under the statistics tab, request statistics, active coldfusion thread, we always have a zero line. Also under memory usage, "cf threads by memory usage" is always empty. I have all three buttons at the top checked so they are monitoring. Is there something else I'm doing wrong?
Environment 1 : dell2850->centos5->vmware->centos5->32bitJDK5->tomcat6->coldfusion8
Environment 2 : sun5120->solaris10->64bitJDK5->tomcat6->coldfusion8
I'm specifically wanting thread info to check if I should increase the defaults in CFIDE configuration. Most everything on the server is being delivered faster now that we are using a 64bit JVM and have moved to solaris in production (from windows). But there are some sections of our cfm logic that are taking much longer now (2000% longer)
Thanks
Ahnjoan

Hi all,
does anyone can write some info why java Threads are
recorded in the list of process (ps -ef) when you run
on a Linux box, but not the same when you run on
Solaris ? Which Thread support is more
performant/stable that on Linux or that on Solaris?
Thanks
FrancescoLinux treats kernell threads as light weight processes and displays them as if they are actual processes - they of course are not, so the results of 'ps' can be misleading. Solaris fully differentiates between its three concepts of threads, lightweight processes and processes and 'ps' only shows actual processes.
Both implementations in Linux and Solaris perform well.
By the way, Solaris 8 has an optional, slightly different thread model than earlier versions of Solaris (in fact it is more like NT's) and that can be more efficient for JVM's or other multithreaded systems running on SMP systems. It can also be worse - your mileage may vary.

Performance problems when running PostgreSQL on ZFS and tomcat

Hi all,
I need help with some analysis and problem solution related to the below case.
The long story:
I'm running into some massive performance problems on two 8-way HP ProLiant DL385 G5 severs with 14 GB ram and a ZFS storage pool in raidz configuration. The servers are running Solaris 10 x86 10/09.
The configuration between the two is pretty much the same and the problem therefore seems generic for the setup.
Within a non-global zone Im running a tomcat application (an institutional repository) connecting via localhost to a Postgresql database (the OS provided version). The processor load is typically not very high as seen below:
NPROC USERNAME SWAP   RSS MEMORY      TIME CPU
    49 postgres 749M 669M   4,7%   7:14:38 13%
     1 jboss    2519M 2536M    18% 50:36:40 5,9%We are not 100% sure why we run into performance problems, but when it happens we experience that the application slows down and swaps out (according to below). When it settles everything seems to turn back to normal. When the problem is acute the application is totally unresponsive.
NPROC USERNAME SWAP   RSS MEMORY      TIME CPU
    1 jboss    3104M 913M   6,4%   0:22:48 0,1%
#sar -g 5 5
SunOS vbn-back 5.10 Generic_142901-03 i86pc    05/28/2010
07:49:08 pgout/s ppgout/s pgfree/s pgscan/s %ufs_ipf
07:49:13    27.67   316.01   318.58 14854.15     0.00
07:49:18    61.58   664.75   668.51 43377.43     0.00
07:49:23   122.02 1214.09 1222.22 32618.65     0.00
07:49:28   121.19 1052.28 1065.94 5000.59     0.00
07:49:33    54.37   572.82   583.33 2553.77     0.00
Average     77.34   763.71   771.43 19680.67     0.00Making more memory available to tomcat seemed to worsen the problem or at least didnt prove to have any positive effect.
My suspicion is currently focused on PostgreSQL. Turning off fsync boosted performance and made the problem less often to appear.
An unofficial performance evaluation on the database with vacuum analyze took 19 minutes on the server and only 1 minute on a desktop pc. This is horrific when taking the hardware into consideration.
The short story:
Im trying different steps but running out of ideas. Weve read that the database block size and file system block size should match. PostgreSQL is 8 Kb and ZFS is 128 Kb. I didnt find much information on the matter so if any can help please recommend how to make this change
Any other recommendations and ideas we could follow? We know from other installations that the above setup runs without a single problem on Linux on much smaller hardware without specific tuning. What makes Solaris in this configuration so darn slow?
Any help appreciated and I will try to provide additional information on request if needed
Thanks in advance,
Kasper

raidz isnt a good match for databases. Databases tend to require good write performance for which mirroring works better.
Adding a pair of SSD's as a ZIL would probably also help, but chances are its not an option for you..
You can change the record size by "zfs set recordsize=8k <dataset>"
It will only take effect for newly written data. Not existing data.

Problems using RMI between linux and windows.

I have problems using RMI between linux and windows.
This is my scenario:
- Server running on linux pc
- Clients running on linux and windows PCs
When a linux client disconnect, first time that server try to call a method of this client, a rmi.ConnectException is generated so server can catch it, mark the client as disconnected and won't communicate with it anymore.
When a windows client (tested on XP and Vista) disconnect, no exceptions are generated (I tryed to catch all the rmi exception), so server cannot know that client is disconnected and hangs trying to communicate with the windows client.
Any ideas?
Thanks in advance.
cambieri

Thanks for your reply.
Yes, we are implementing a sort of callback using Publisher (remote Observable) and Subscribers (remote Observer). The pattern and relative code is very well described at this link: http://www2.sys-con.com/ITSG/virtualcd/java/archives/0210/schwell/index.html (look at the notifySubscribers(Object pub, Object code) function).
Everything works great, the only problem is this: when a Publisher that reside on a Linux server try to notify something to a "dead" Subscriber that reside on a Windows PC it does't receive the usual ConnectException and so tends to hang.
As a workaround we have solved now starting a new Thread for each update (notification), so only that Thread is blocked (until the timeout i guess) and not the entire "notifySubscribers" function (that contact all the Subscribers).
Beside this, using the Thread seem to give us better performance.
Is that missed ConnectException a bug? Or we are just making some mistake?
We are using java 6 and when both client and server are Linux or Windows the ConnectException always happen and we don't have any problem.
I hope that now this information are enough.
Thanks again and greetings.
O.C.

Performance problems with jdk 1.5 on Linux plattform

Performance problems with jdk 1.5 on Linux plattform
(not tested on Windows, might be the same)
After refactoring using the new features from java 1.5 I lost
performance significantly:
public Vector<unit> units;
The new code:
for (unit u: units) u.accumulate();
runs more than 30% slower than the old code:
for (int i = 0; i < units.size(); i++) units.elementAt(i).accumulate();
I expected the opposite.
Is there any information available that helps?

Here's the complete benchmark code I used:package test;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Vector;
public class IterationPerformanceTest {
     private int m_size;
     public IterationPerformanceTest(int size) {
          m_size = size;
     public long getArrayForLoopDuration() {
          Integer[] testArray = new Integer[m_size];
          for (int item = 0; item < m_size; item++) {
               testArray[item] = new Integer(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testArray[index]);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayForEachDuration() {
          Integer[] testArray = new Integer[m_size];
          for (int item = 0; item < m_size; item++) {
               testArray[item] = new Integer(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testArray) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListForLoopDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testList.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListForEachDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListIteratorDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListForLoopDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testList.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListForEachDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListIteratorDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorForLoopDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testVector.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorForEachDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testVector) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorIteratorDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testVector.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
      * @param args
     public static void main(String[] args) {
          IterationPerformanceTest test = new IterationPerformanceTest(1000000);
          System.out.println("\n\nRESULTS:");
          long arrayForLoop = test.getArrayForLoopDuration();
          long arrayForEach = test.getArrayForEachDuration();
          long arrayListForLoop = test.getArrayListForLoopDuration();
          long arrayListForEach = test.getArrayListForEachDuration();
          long arrayListIterator = test.getArrayListIteratorDuration();
//          long linkedListForLoop = test.getLinkedListForLoopDuration();
          long linkedListForEach = test.getLinkedListForEachDuration();
          long linkedListIterator = test.getLinkedListIteratorDuration();
          long vectorForLoop = test.getVectorForLoopDuration();
          long vectorForEach = test.getVectorForEachDuration();
          long vectorIterator = test.getVectorIteratorDuration();
          System.out.println("Array      for-loop: " + getPercentage(arrayForLoop, arrayForLoop) + "% ("+getDuration(arrayForLoop)+" sec)");
          System.out.println("Array      for-each: " + getPercentage(arrayForLoop, arrayForEach) + "% ("+getDuration(arrayForEach)+" sec)");
          System.out.println("ArrayList for-loop: " + getPercentage(arrayForLoop, arrayListForLoop) + "% ("+getDuration(arrayListForLoop)+" sec)");
          System.out.println("ArrayList for-each: " + getPercentage(arrayForLoop, arrayListForEach) + "% ("+getDuration(arrayListForEach)+" sec)");
          System.out.println("ArrayList iterator: " + getPercentage(arrayForLoop, arrayListIterator) + "% ("+getDuration(arrayListIterator)+" sec)");
//          System.out.println("LinkedList for-loop: " + getPercentage(arrayForLoop, linkedListForLoop) + "% ("+getDuration(linkedListForLoop)+" sec)");
          System.out.println("LinkedList for-each: " + getPercentage(arrayForLoop, linkedListForEach) + "% ("+getDuration(linkedListForEach)+" sec)");
          System.out.println("LinkedList iterator: " + getPercentage(arrayForLoop, linkedListIterator) + "% ("+getDuration(linkedListIterator)+" sec)");
          System.out.println("Vector     for-loop: " + getPercentage(arrayForLoop, vectorForLoop) + "% ("+getDuration(vectorForLoop)+" sec)");
          System.out.println("Vector     for-each: " + getPercentage(arrayForLoop, vectorForEach) + "% ("+getDuration(vectorForEach)+" sec)");
          System.out.println("Vector     iterator: " + getPercentage(arrayForLoop, vectorIterator) + "% ("+getDuration(vectorIterator)+" sec)");
     private static NumberFormat percentageFormat = NumberFormat.getInstance();
     static {
          percentageFormat.setMinimumIntegerDigits(3);
          percentageFormat.setMaximumIntegerDigits(3);
          percentageFormat.setMinimumFractionDigits(2);
          percentageFormat.setMaximumFractionDigits(2);
     private static String getPercentage(long base, long value) {
          double result = (double) value / (double) base;
          return percentageFormat.format(result * 100.0);
     private static NumberFormat durationFormat = NumberFormat.getInstance();
     static {
          durationFormat.setMinimumIntegerDigits(1);
          durationFormat.setMaximumIntegerDigits(1);
          durationFormat.setMinimumFractionDigits(4);
          durationFormat.setMaximumFractionDigits(4);
     private static String getDuration(long nanos) {
          double result = (double)nanos / (double)1000000000;
          return durationFormat.format(result);
}

Performance problems with SAP GUI 7.10 and BEx 3.5 Patch 400?

Hi everybody,
we installed SAP GUI 7.10 and BEx 3.5 Patch 400 and detected hugh performance problems with this version in comparison to the SAP GUI 6.40 and BEx 3.5 or BEx 7.0 Patch 800.
Does anybody detect the same problems?
Best regards,
Ulli

Most important question when you are talking about performance-issues:
which OC are you working on and which excel version?
ciao
Joke

Performance Problems on Faces Navigation Diagram and Hyperthreading query

Am I the only one having performance problems when dealing with Faces-Config Diagrams of about 35 JSPs displayed on the sheet. using Jdev 10.1.3 It's taking my workstation about a full minute and a half to update the name of an arrow. The most stressed component during this task seems to be the CPU.
And just another question has anybody investigated how is the performance of Jdev affected by either enabling or disabling hyperthreading? In my case my CPU usage manages to reach only 50%. I'm tempted to switch HT off to let JDev use all the cpu power. if that would be the case.

Hello Diego,
you mentioned that you compared a BEx Query with the Web INtelligence report. Could you provide more details here ?
- what are the elements in the rows, columns and free characterisitcs in the BEx Query ?
- was the query execute as designed in the BEx Query Designer with BEx Web Reporting ?
- what are the elements in the WebIntelligence Query panel ?
thanks
Ingo

Performance Problems with "For all Entries" and a big internal table

We have big Performance Problems with following Statement:
SELECT * FROM zeedmt_zmon INTO TABLE gt_zmon_help
FOR ALL ENTRIES IN gt_zmon_help
    WHERE
    status = 'IAI200' AND
    logdat IN gs_dat AND
    ztrack = gt_zmon_help-ztrack.
In the internal table gt_zmon_help are over 1000000 entries.
Anyone an Idea how to improve the Performance?
Thank you!

>
Matthias Weisensel wrote:
> We have big Performance Problems with following Statement:
>
>
SELECT * FROM zeedmt_zmon INTO TABLE gt_zmon_help
>   FOR ALL ENTRIES IN gt_zmon_help
>     WHERE
>     status = 'IAI200' AND
>     logdat IN gs_dat AND
>     ztrack = gt_zmon_help-ztrack.
>
> In the internal table gt_zmon_help are over 1000000 entries.
> Anyone an Idea how to improve the Performance?
>
> Thank you!
You can't expect miracles. With over a million entries in your itab any select is going to take a bit of time. Do you really need all these records in the itab? How many records is the select bringing back? I'm assuming that you have got and are using indexes on your ZEEDMT_ZMON table.
In this situation, I'd first of all try to think of another way of running the query and restricting the amount of data, but if this were not possible I'd just run it in the background and accept that it is going to take a long time.

Performance problems with EP 6 and MS IE

Hi everybody,
since a couple of days, we are facing a sever performance problem with our SAP EP 6.0. When I access the system with MS Internet Explorer 6.0, it takes 5-10 minutes after the Login. With Firefox Browser, the performance is ok. Therefore I assume that it must be a problem with the IE settings. Does anybody know a solution?
Best regards,
Michael

There are a few things that this could be. I've seen the setting "Empty Temporary Internet Files folder when browser is closed" cause a lot of performance problems (This is in the advanced settings in your IE).
This will cause your cache to be cleared out each time the browser is closed and cause a lot more data to be downloaded each time you login to the system.
For more analysis I'd recommend putting a tool like HTTPWatch into your IE browser and seeing which requests are using the most time.

Performance Problems Bex 7.0 and Office 2007 Workbooks

Hi
we had a performance Problem with Bex 7.0 and Worksbooks in Office 2007.
The Workbooks are created with Office 2003 and runs with good performance but in Office 2007 the performance is inacceptable.
E.g. open Workbook with Office 2003   --    30 seconds
       open Workbook with Office 2007   --    15 minutes
We do everything what we find in SAP Notes, Whitepapers oder SDN Messages.
For Example:
- We installed all Excel Patches witch descriped in: Microsoft Excel 2007 &
SAP Business Explorer Compatibility
- We set the optimize X: RS_FRONTEND_INIT setting u2018ANA_USE_OPTIMIZE_STG = Xu2019
- We open worksbooks in Office 2007 with the repair Flag.
- We used Flag open in XLS format
But same Workbooks are extrem slow.
We try to create a new Workbook with Office 2007 and it runs with good performance.
But there are 500 Workbooks we didn`t wont to create all new.
System Information:
BW: 7.0 Netweaver 7.01 BI_CONT 7.05
Client: SAP Gui 7.10 BI Explorer: 902
Thank your for your Help.
Edited by: Carsten Ziemann on Feb 2, 2011 4:36 PM

Hello Carsten,
Try to use Workbook compression:
- Open the specific workbook in BEx Analyzer
- Open Workbook Settings dailog
- Check "Use Optimized Storage"
- Click on OK Button
- Save the workbook
But also, your front end tools are on a very old version.
I would like to recommend you to install the latest patch of SAPGUI 7.20 and Business Explore 7.20.
Front End Version 7.10 will be supported until April 2011.
But, if you want to continue using 7.10, update to latest patch:
http://service.sap.com/swdc
> Support Packages and Patches
> Browse our Download Catalog
> SAP Frontend Components
> SAP GUI FOR WINDOWS
> SAP GUI FOR WINDOWS 7.10 CORE
> Win32
_ > gui710_20-10002995.exe
   | > BI ADDON FOR SAP GUI
   | > BI 7.0 ADDON FOR SAP GUI 7.10
   |_ > bi710sp14_1400-10004472.exe
Cheers,
Edward John

Performance problems with DFSN, ABE and SMB

Hello,
We have identified a problem with DFS-Namespace (DFSN), Access Based Enumeration (ABE) and SMB File Service.
Currently we have two Windows Server 2008 R2 servers providing the domain-based DFSN in functional level Windows Server 2008 R2 with activated ABE.
The DFSN servers have the most current hotfixes for DFSN and SMB installed, according to http://support.microsoft.com/kb/968429/en-us and http://support.microsoft.com/kb/2473205/en-us
We have only one AD-site and don't use DFS-Replication.
Servers have 2 Intel X5550 4 Core CPUs and 32 GB Ram.
Network is a LAN.
Our DFSN looks like this:
\\contoso.com\home
   Contains 10.000 Links
   Drive mapping on clients to subfolder \\contoso.com\home\username
\\contoso.com\group
   Contains 2500 Links
   Drive mapping on clients directly to \\contoso.com\group
On \\contoso.com\group we serve different folders for teams, projects and other groups with different access permissions based on AD groups.
We have to use ABE, so that users see only accessible Links (folders)
We encounter sometimes multiple times a day enterprise-wide performance problems for 30 seconds when accessing our Namespaces.
After six weeks of researching and analyzing we were able to identify the exact problem.
Administrators create a new DFS-Link in our Namespace \\contoso.com\group with correct permissions using the following command line:
dfsutil.exe link \\contoso.com\group\project123 \\fileserver1\share\project123
dfsutil.exe property sd grant \\contoso.com\group\project123 CONTOSO\group-project123:RX protect replace
This is done a few times a day.
There is no possibility to create the folder and set the permissions in one step.
DFSN process on our DFSN-servers create the new link and the corresponding folder in C:\DFSRoots.
At this time, we have for example 2000+ clients having an active session to the root of the namespace \\contoso.com\group.
Active session means a Windows Explorer opened to the mapped drive or to any subfolder.
The file server process (Lanmanserver) sends a change notification (SMB-Protocol) to each client with an active session \\contoso.com\group.
All the clients which were getting the notification now start to refresh the folder listing of \\contoso.com\group
This was identified by an network trace on our DFSN-servers and different clients.
Due to ABE the servers have to compute the folder listing for each request.
DFS-Service on the servers doen't respond for propably 30 seconds to any additional requests. CPU usage increases significantly over this period and went back to normal afterwards. On our hardware from about 5% to 50%.
Users can't access all DFS-Namespaces during this time and applications using data from DFS-Namespace stop responding.
Side effect: Windows reports on clients a slow-link detection for \\contoso.com\home, which can be offline available for users (described here for WAN-connections: http://blogs.technet.com/b/askds/archive/2011/12/14/slow-link-with-windows-7-and-dfs-namespaces.aspx)
Problem doesn't occure when creating a link in \\contoso.com\home, because users have only a mapping to subfolders.
Currently, the problem doesn't occure also for \\contoso.com\app, because users usually don't use Windows Explorer accessing this mapping.
Disabling ABE reduces the DFSN freeze time, but doesn't solve the problem.
Problem also occurs with Windows Server 2012 R2 as DFSN-server.
There is a registry key available for clients to avoid the reponse to the change notification (NoRemoteChangeNotify, see http://support.microsoft.com/kb/812669/en-us)
This might fix the problem with DFSN, but results in other problems for the users. For example, they have to press F5 for refreshing every remote directory on change.
Is there a possibility to disable the SMB change notification on server side ?
TIA and regards,
Ralf Gaudes

Hi,
Thanks for posting in Microsoft Technet Forums.
I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.
Regards.
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RH Linux and AQ performance problem

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