Question on running multiple clients in production
We have a question that hopefully someone might be able to clarify for us. We currently have a production SAP landscape consisting on 5 separate SAP clients running on five R/3 4.6c instances on RS6000/Informix and we are looking at alternatives around landscape optimization as part of a plan to upgrade to ECC6. One of the options we are weighing is to create a single SAP instance on 64 bit Windows 2003 Enterprise and SQL Server 2005, migrate the different clients onto the single system resulting in a single instance/multiclient configuration, and then to upgrade the consolidated server to ECC6. We have been researching the feasibility of this approach and it appears that it is a supported configuration (as per SAPNote 31557), however it is apparently not widely used and there are references to challenges with that approach. Wanted to see if anyone had experiences with this type of configuration and whether there are any specific showstopper issues that would make this unworkable as a solution.
Below is a list of some of the questions we are looking to address:
Can anyone cite a reference where a multi client single instance configuration was successful?
Can anyone cite a reference where a multi client single instance configuration was unsuccessful and the reason why it did not work?
Is there an upper boundary on the number of clients that can be supported in a productive multi-client instance?
Are there any specific issues with the CTS system that need to be considered
Are there any known issues with the ECC6 platform that need to be considered, especially with the potential deployment of a EP usage type and the J2EE stack?
Any known issues with upgrades after moving to a multi-client environment?
Were there any unexpected surprises (i.e. client independent objects that were not anticipated).
How was the issue of overlapping number ranges in different clients addressed?
Any feedback would be greatly appreciated.
Rich P
Hello Richard,
You gave a very good question to ponder on
Check this link, seems to be helpful.
<b>Client & Multiclient Operation</b>
http://help.sap.com/saphelp_nw2004s/helpdata/en/83/08443c4a089537e10000000a114084/frameset.htm
I would get back to you, incase I find more valuable information.
Regards,
Ammey Kesarkar
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[ code ]
Exception in thread "main" java.lang.NullPointerException
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at PostOfficeImpl_Skel.dispatch(Unknown Source)
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//endoffilePlease advise as this is very urgentHi
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import java.io.*;
import java.net.*;
import java.lang.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.RemoteException;
import java.util.HashMap;
import java.util.*;
public class PostOfficeImpl extends java.rmi.server.UnicastRemoteObject implements PostOffice {
//Implementations must have an explicit constructor in order to declare the
//RemoteException exception
public PostOfficeImpl() throws java.rmi.RemoteException {
super();
public static LinkedListImpl list = new LinkedListImpl();
public static oListImpl ovarList = new oListImpl();
public static iListImpl ivarList =new iListImpl();
public static lipsList llfirst;
public static oList opchannel, ofirst, onext;
public static iList ipchannel, ichan, ifirst;
public static String[] variNumber= new String[100];
public static String[] inoutChan, inChan, outChan,inVAR, invarLIST,outVAR, outvarLIST ;
public static String[][] driveMat;
DriverMatrix_mthds drive = new DriverMatrix_mthds();
private static Boolean All_Vacant;
private static Boolean tAll_Vacant;
public void sendAll_Vacant(Boolean All_Vacant) throws RemoteException {
tAll_Vacant = All_Vacant;
public Boolean getAll_Vacant() throws RemoteException{
return tAll_Vacant;
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ifirst = null;
ofirst=null;
int i=0, j=0, k=0, ind1=0, ind2=0;
try{/// initialise list
drive = new DriverMatrix_mthds();
drive.VarTypeArray();
drive.nodeHeadVarType();
String[] variablel = drive.Variablelist();
drive.lipsvariablist();
drive.NodeOrigin();
drive.nodeInput();
drive.numOfnodes();
drive.noOfVariables();
drive.Assignlist();
drive.novarType();
drive.varNameType();
drive.nodeNumName();
drive.driverMat();
String[][] lookupvar = drive.varNameType();
//tempdrive = drive.driverMat();
long leng1 = variablel.length;
int varlistlength = (int) leng1;
int counter;
String s1="";
String s2="";
String s3 = "";
String s4 = "";
String s6 = "";
int s5=0, c=0;
while(variablel[k] !=null){
k=k+1;
int i1, j1;
String varname, varnumber;
varnumber = "";
while(i<=variablel.length-1){
if(variablel!=null){
c=c+1;
i=i+1;
try{
ind1=0; ind2 = 0;i=0;
while(!(variablel[i].equals("end of file"))){
s1 = variablel[i];
i=i+1;
s2 = variablel[i];
i=i+1;
System.out.println(" " + s1+" "+s2);
while(!(variablel[i].equals("end of input variable"))){
s4 = variablel[i];
i1=0;
Brkwhile:while(i1<=lookupvar.length-1){
j1=1;
if(lookupvar[i1][j1] != null){
if(lookupvar[i1][j1].equals(s4)){
s3 = lookupvar[i1][0];
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i1=i1+1;
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s5 = 0;
s6 = null;
ifirst= new iList(s3,s4, s5, s6);
ivarList.add(ifirst);
System.out.println(s3+" "+s4+" "+s5+" "+s6);
i=i+1;
i = i + 1;
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while(!(variablel[i].equals("end of output variable"))){
s4 = variablel[i];
i1=0;
j1=1;
Brkwhile:while(lookupvar[i1][j1] != null){
if(lookupvar[i1][j1].equals(s4)){
s3 = lookupvar[i1][0];
break Brkwhile;
i1=i1+1;
s5 = 0;
s6 = null;
ofirst= new oList(s3,s4, s5, s6);
ovarList.add(ofirst);
System.out.println(s3+" "+s4+" "+s5+" "+s6);
i=i+1;
llfirst = new lipsList(s1, s2, ivarList, ovarList);
list.add(llfirst);
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i=i+1;
catch (NullPointerException ne){
catch (Exception d){}
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throws RemoteException{
String nodnum = sndNodetail.srcNum;
String varnum = sndNodetail.varNum;
int status = 0;
llfirst = list.getFirst();
try{mainbegin:while (llfirst != null){
if((llfirst.nodeNum).equals(nodnum)){
ofirst = ovarList.getFirst();
while(ofirst != null){
if((ofirst.varNum).equals(varnum)){
if(ofirst.varVal==null){
status = 1;
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ofirst = ofirst.next;
llfirst = llfirst.next;
catch (NullPointerException nl){}
return status;
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throws RemoteException{
dataPacket datDetail = sendToRTS;
String nnum, vnum,typename, dval;
String dtype = "";
nnum = datDetail.nodeNum;
vnum = datDetail.varNum;
typename = datDetail.dataType;
dval = String.valueOf(datDetail.dataVal);
String [][] tempdrive, varnametype;
int status =0;
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status =0;
try{
//DriverMatrix_mthds drive = new DriverMatrix_mthds();
drive.VarTypeArray();
drive.Variablelist();
drive.NodeOrigin();
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drive.noOfVariables();
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drive.nodeNumName();
drive.driverMat();
tempdrive = drive.driverMat();
String varname="";
int i,j;
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for(i=0; i<=lookupvar.length-1; i++){
j=0;
if(lookupvar[i][j] != null){
if(lookupvar[i][j].equals(typename)){
dtype = lookupvar[i][1];
}//varname is moved to dtype n used for checking
for(i=0; i<=tempdrive.length-1; i++){j=0;
if (tempdrive[i][j] != null){
if (tempdrive[i][0].equals(vnum)){
if (tempdrive[i][1].equals(nnum)){
if(tempdrive[i][2].equals(dtype)){
status = 1;
}//System.out.println("received data " vnum " "+ nnum +" " + dtype +" "+dval);// after checking status if the status is 1 then set the counter n olist// to no of times the value has to be ditributed
int Ccount =0;
//opchannel = llfirst.olist;
try{
System.out.println("status"+status);
if (status == 1){
llfirst = list.getFirst();
mainWhile: while (llfirst != null){
if((llfirst.nodeNum).equals(nnum)){
ofirst = ovarList.getFirst();
while(ofirst != null){
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ofirst.varVal =dval;
//setting the counter for the varname
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j=0;
if (tempdrive[i][j] != null){
if (tempdrive[i][0].equals(vnum)){
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if(tempdrive[i][j] != null){
if(tempdrive[i][j].equals("1")){
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ofirst.counter = Ccount;
ofirst.varNum = vnum;for(i=0; i<=lookupvar.length-1; i++){
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llfirst = llfirst.next;
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*find the node numbers ..knowing the node numbers parse through data structure
and set the input values to value and status 1./
llfirst = list.getFirst();
while(llfirst != null){
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while(ifirst != null){
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ifirst=ifirst.next;
llfirst=llfirst.next;
catch (Exception e){};
return status;
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throws RemoteException{
String srcnum = inputReq.srcNum;
String varnum = inputReq.varNum;
int availstatus =0;
llfirst = list.getFirst();
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whileloop:while (llfirst != null){
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breakloop: while(ifirst != null){
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if((ifirst.varNum).equals(varnum)){
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ifirst.varStat = 0;
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ifirst = ifirst.next;
llfirst = llfirst.next;
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String nnum, vnum, dtype, dval;
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dtype="";
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// ipchannel = llfirst.ilist;
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//System.out.println(llfirst);
catch(NullPointerException s){}
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driver.VarTypeArray();
driver.Variablelist();
driver.NodeOrigin();
driver.nodeInput();
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driver.noOfVariables();
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int i, j;
String varNum = vnum;
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j=0;
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if(lookupvar[i][j].equals(vnum)){
dtype = lookupvar[i][2];
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throws RemoteException{
String nnum = nodeNum;
llfirst = list.getFirst();
while (llfirst != null){
if((llfirst.nodeNum).equals(nnum)){
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llfirst = llfirst.next;
System.out.println("node Number does not match with the list of node numbers generated..try again");
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throws RemoteException{
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driver.nodeInput();
driver.numOfnodes();
driver.noOfVariables();
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int i, j;
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driver.Variablelist();
driver.NodeOrigin();
driver.nodeInput();
driver.numOfnodes();
driver.noOfVariables();
driver.novarType() ;
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for(j=0; j<=2; j++){
if(lookupvar[i][j] != null){
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driver.VarTypeArray();
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int i, j;
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i=i+1;
j=j+1;
System.out.println("endofinput");
inoutChan[j]="endofinchan";
j=j+1;
i=i+1;
while(!(varLIST[i].equals("end of output variable"))){
inoutChan[j] = varLIST[i];
i=i+1;
j=j+1;
System.out.println("endofoutput");
inoutChan[j]="endofoutchan";
break WHILELOOP;
i=i+1;
arrlength =j;
for(j=0; j<=arrlength-1; j++){
System.out.println(inoutChan[j]);
catch (Exception e){}
return inoutChan;
public String[] inchannel(String[] inoutChan) throws RemoteException{
int count=0;int i=0, j=0;
System.out.println("entered");
while(inoutChan[count]!=null){
System.out.println(count + " " +inoutChan[count]);
count=count+1;
inChan = new String[count];
while(!(inoutChan[i].equals("endofinchan"))){
inChan[j] =inoutChan[i];
j=j+1; i=i+1;
return inChan;
public String[] outchannel(String[] inoutChan) throws RemoteException{
int count=0;int i=0, j=0;
System.out.println("entered");
while(inoutChan[count]!=null){
System.out.println(count + " " +inoutChan[count]);
count=count+1;
outChan = new String[count+1];
while(!(inoutChan[i].equals("endofinchan"))){
i=i+1;
i=i+1;
while(!(inoutChan[i].equals("endofoutchan"))){
outChan[j] =inoutChan[i];
j=j+1; i=i+1;
return outChan;
public String[] invarChan(String nodename, int guardno)throws RemoteException{
try{
DriverMatrix_mthds drive = new DriverMatrix_mthds();
invarLIST = drive.invarlist();
int i=0;int j;
while(invarLIST[i]!=null){
i=i+1;
int arrlength = i;
inVAR = new String[arrlength];
i=0; j=0;
WHILELOOP: while(!(invarLIST[i].equals("end of file"))){
if (invarLIST[i].equals(nodename)){
i=i+1;
while(!(invarLIST[i].equals(nodename+String.valueOf(guardno)))){
i=i+1;}
i=i+1;
while(!(invarLIST[i].equals("endofguard"))){
System.out.println(invarLIST[i]);inVAR[j]=invarLIST[i]; i=i+1; j=j+1;}
break WHILELOOP;}
i=i+1;}
}catch (Exception d){}
return inVAR;
public String[] outvarChan(String nodename, int guardcount)throws RemoteException{
try{
DriverMatrix_mthds drive = new DriverMatrix_mthds();
outvarLIST = drive.outvarlist();
int i=0;int j;
while(outvarLIST[i]!=null){
i=i+1;
int arrlength = i;
outVAR = new String[arrlength];
i=0; j=0;
WHILELOOP: while(!(outvarLIST[i].equals("end of file"))){
if (outvarLIST[i].equals(nodename)){
i=i+1;
while(!(outvarLIST[i].equals(nodename+String.valueOf(guardcount)+"guard"))){
i=i+1;}
i=i+1;
while(!(outvarLIST[i].equals("end guard"))){
System.out.println(outvarLIST[i]);outVAR[j]=outvarLIST[i]; i=i+1; j=j+1;}
break WHILELOOP;}
i=i+1;}
}catch (Exception d){}
return outVAR;
private static Boolean start;
private static Boolean tstart;
public void sendstart(Boolean start) throws RemoteException {
tstart = start;
public Boolean getstart() throws RemoteException{
return tstart;
private static Boolean done;
private static Boolean tdone;
public void senddone(Boolean done) throws RemoteException {
tdone = done;
public Boolean getdone() throws RemoteException{
return tdone;
private static Boolean vac_busy1;
private static Boolean tvac_busy1;
public void sendvac_busy1(Boolean vac_busy1) throws RemoteException {
tvac_busy1 = vac_busy1;
public Boolean getvac_busy1() throws RemoteException{
return tvac_busy1;
private static int cus1_rit1;
private static int tcus1_rit1;
public void sendcus1_rit1(int cus1_rit1) throws RemoteException {
tcus1_rit1 = cus1_rit1;
public int getcus1_rit1() throws RemoteException{
return tcus1_rit1;
private static int cus1_rit2;
private static int tcus1_rit2;
public void sendcus1_rit2(int cus1_rit2) throws RemoteException {
tcus1_rit2 = cus1_rit2;
public int getcus1_rit2() throws RemoteException{
return tcus1_rit2;
private static int cus1_rit3;
private static int tcus1_rit3;
public void sendcus1_rit3(int cus1_rit3) throws RemoteException {
tcus1_rit3 = cus1_rit3;
public int getcus1_rit3() throws RemoteException{
return tcus1_rit3;
private static int cus1_it1;
private static int tcus1_it1;
public void sendcus1_it1(int cus1_it1) throws RemoteException {
tcus1_it1 = cus1_it1;
public int getcus1_it1() throws RemoteException{
return tcus1_it1;
private static int cus1_it2;
private static int tcus1_it2;
public void sendcus1_it2(int cus1_it2) throws RemoteException {
tcus1_it2 = cus1_it2;
public int getcus1_it2() throws RemoteException{
return tcus1_it2;
private static int cus1_it3;
private static int tcus1_it3;
public void sendcus1_it3(int cus1_it3) throws RemoteException {
tcus1_it3 = cus1_it3;
public int getcus1_it3() throws RemoteException{
return tcus1_it3;
private static int stkit_11;
private static int tstkit_11;
public void sendstkit_11(int stkit_11) throws RemoteException {
tstkit_11 = stkit_11;
public int getstkit_11() throws RemoteException{
return tstkit_11;
private static int stkit_12;
private static int tstkit_12;
public void sendstkit_12(int stkit_12) throws RemoteException {
tstkit_12 = stkit_12;
public int getstkit_12() throws RemoteException{
return tstkit_12;
private static int stkit_13;
private static int tstkit_13;
public void sendstkit_13(int stkit_13) throws RemoteException {
tstkit_13 = stkit_13;
public int getstkit_13() throws RemoteException{
return tstkit_13;
private static int c1_it1;
private static int tc1_it1;
public void sendc1_it1(int c1_it1) throws RemoteException {
tc1_it1 = c1_it1;
public int getc1_it1() throws RemoteException{
return tc1_it1;
private static int c1_it2;
private static int tc1_it2;
public void sendc1_it2(int c1_it2) throws RemoteException {
tc1_it2 = c1_it2;
public int getc1_it2() throws RemoteException{
return tc1_it2;
private static int c1_it3;
private static int tc1_it3;
public void sendc1_it3(int c1_it3) throws RemoteException {
tc1_it3 = c1_it3;
public int getc1_it3() throws RemoteException{
return tc1_it3;
//endoffile -
Running JMS client on multiple systems (using J2EE 1.4)
Hello all,
Can anyone tell me if it is possible to run a JMS client on a system that is not running a J2EE server on localhost? Is there any way to reference the server on another machine (using J2EE 1.4 server)??
I found information in the J2EE 1.3.1 tutorial that tells of ways to
- run the client program with both systems running the server
- run the client program with only one system running the server (which isn't localhost)
However, the corresponding portion of J2EE 1.4 tutorial only specifies running the client with App server running on both systems...... does this mean that we cannot run a standalone client program with no server on localhost in case of the 1.4 server?
Also, most of the tutorials on JMS I have seen so far only explain the scenario with both the client and the server on a single machine. Is this how average JMS applications work?? What I mean to ask is, in a typical scenario where does a JMS client run....?? at the server, or at the client (which may or may not be running a server at localhost).
Thanks for your time.The functionality has not changed in J2EE 1.4 outside of reving to JMS 1.1
-
Hello,
I have quite simple problem. I have two database servers (9i and 10g). If I install on my PC (windows XP) client for 10g, I could connect only to 10g server. If I have install both (9i and 10g) clients, I could connect to both servers. My question is, how sqlplus or other programs finds out which client to use?
SASAEach executable has a dependent Oracle Core DLL, i.e. CORE35.DLL, CORE40.DLL, oracore8.dll etc., linked to it.
When you run an executable, PLUS33.EXE for example, your system searches the PATH for the dependent Oracle CORE DLL.
You can identify the DLL by using Dependency Walker (DEPENDS.EXT) from the NT Resource Kit or SDK.
The GetModuleFileName() funtion returns something like "C:\ORA805\BIN\xxxx.DLL" .
It strips the string from the "BIN\xxxx.DLL" and retrieves the ORACLE_HOME (eg: C:\ORA805).
With the string returned above, Oracle then checks the %ORACLE_HOME%\bin\ORACLE.KEY file which includes the Oracle Hive
for all of the Oracle products installed in the Oracle_HOME.
For example: If the ORACKLE.KEY file has the string "SOFTWARE/Oracle/HOME1"
the hive is HKEY_LOCAL_MACHINE/Software/Oracle/HOME1.
If the oracle.key file is not present, then the Default Oracle Home is used.
This is the case for Non-Multiple Oracle Home products. -
Multiple-client, same server, different configurations
Hi experts,
Recently we have got a project of IS-U Electricity where it has been planned that the same server we used for the last project will be used for this upcoming project where the configurations are diffrent from each other but both of them will run together in same development, quality and production servers.
My question is whether we would be able to configure sap as per the requirements for the upcoming project to a particular client whereas the rest of the clients will use old configurations for the existing project in the same server. Will there be any cross-client configuration conflicts?
- ArghyaArghya:
The answer to this question is unrelated the industry solution. Multiple client scenarios are used in many solutions. Some configuration is client dependent and so would be different in each client; other configuration is client independent and would be used in all clients. That would be part of the analysis to determine if multiple clients or multiple systems is the correct approach.
regards,
bill. -
A few of questions concerning the Oracle Client
Hi
Firstly, I'd just like to say that what I know about Oracle could be written on a very small postage stamp that had somehow been torn in half and then in half again.
Apologies for the waffle...
One of my roles within our organisation, is to create and deploy application using Novell ZENWorks to our users who will shortly be moving to a purely Windows XP SP2 environment.
Q1-Is the Oracle 8 client fully supported by XP SP2?
Our organisation runs multiple Oracle DB's and up until now, separate application objects have been created for each DB with that DB's settings in it's TNSNAMES.ORA file which is pushed out along with that application object. The trouble is that some users need to access more than one DB which means that they sometimes have multiple copies of the Oracle Client installed, using different TNSNAMES.ORA files depending on what DB they want to connect to.
Q2-Can I either carry out one install of say the Oracle 9 client and have one TNSNAMES.ORA file with all the DB settings in? Or even better still, can I install the client on one of the shared volumes on the server (I realise that I'd have to copy certain files to the workstation) and then get all the workstations to run the client from there?
Q3-Our preferred method of deploying applications is to use MSI's, but for some reason Oracle only supply some kind of primative and cumbersome response file system which I've found often gives random results depending on what the weather is like. Is there a better way of getting the client onto the workstations without having to mess around editing RSP's?
Sorry for posing such potentially dumb questions
JamesQ1-Is the Oracle 8 client fully supported by XP SP2?AFAIK Oracle 8 products are no longer supported. Use 9i client instead.
Anyway here is link to certification matrix: http://www.oracle.com/technology/support/metalink/index.html
Or even better still, can I install the client on one of the shared volumes on the server...I guess this won't working. Install Client on each machine and share only tnsnames.ora, or you could resolving tnsnames from OID (LDAP) server.
Is there a better way of getting the client onto the workstations without having to mess around editing RSP's?You could make manual install and record the response file. That responsfile you could use on other machines. You don't need edit anything. Sorry, I can't see anything primitive and cumbersome on RSP. You can choose manual installation or using responsfile, there is not other option. -
Accessing the same stateful session bean from multiple clients in a clustered environment
I am trying to access the same stateful session bean from multiple
clients. I also want this bean to have failover support so we want to
deploy it in a cluster. The following description is how we have tried
to solve this problem, but it does not seem to be working. Any
insight would be greatly appreciated!
I have set up a cluster of three servers. I deployed a stateful
session bean with in memory replication across the cluster. A client
obtains a reference to an instance of one of these beans to handle a
request. Subsequent requests will have to use the same bean and could
come from various clients. So after using the bean the first client
stores the handle to the bean (actually the replica aware stub) to be
used by other clients to be able to obtain the bean. When another
client retrieves the handle gets the replica aware stub and makes a
call to the bean the request seems to unpredictably go to any of the
three servers rather than the primary server hosting that bean. If the
call goes to the primary server everything seems to work fine the
session data is available and it gets backed up on the secondary
server. If it happens to go to the secondary server a bean that has
the correct session data services the request but gives the error
<Failed to update the secondary copy of a stateful session bean from
home:ejb20-statefulSession-TraderHome>. Then any subsequent requests
to the primary server will not reflect changes made on the secondary
and vice versa. If the request happens to go to the third server that
is not hosting an instance of that bean then the client receives an
error that the bean was not available. From my understanding I thought
the replica aware stub would know which server is the primary host for
that bean and send the request there.
Thanks in advance,
Justin
If 'allow-concurrent-call' does exactly what you need, then you don't have a problem,
do you?
Except of course if you switch ejb containers. Oh well.
Mike
"FBenvadi" <[email protected]> wrote:
>I've got the same problem.
>I understand from you that concurrent access to a stateful session bean
>is
>not allowed but there is a
>token is weblogic-ejb-jar.xml that is called 'allow-concurrent-call'
>that
>does exactly what I need.
>What you mean 'you'll get a surprise when you go to production' ?
>I need to understand becouse I can still change the design.
>Thanks Francesco
>[email protected]
>
>"Mike Reiche" <[email protected]> wrote in message
>news:[email protected]...
>>
>> Get the fix immediately from BEA and test it. It would be a shame to
>wait
>until
>> December only to get a fix - that doesn't work.
>>
>> As for stateful session bean use - just remember that concurrent access
>to
>a stateful
>> session bean is not allowed. Things will work fine until you go to
>production
>> and encounter some real load - then you will get a surprise.
>>
>> Mike
>>
>> [email protected] (Justin Meyer) wrote:
>> >I just heard back from WebLogic Tech Support and they have confirmed
>> >that this is a bug. Here is their reply:
>> >
>> >There is some problem in failover of stateful session beans when its
>> >run from a java client.However, it is fixed now.
>> >
>> >The fix will be in SP2 which will be out by december.
>> >
>> >
>> >Mike,
>> >Thanks for your reply. I do infact believe we are correctly using
>a
>> >stateful session bean however it may have been misleading from my
>> >description of the problem. We are not accessing the bean
>> >concurrently from 2 different clients. The second client will only
>> >come into play if the first client fails. In this case we want to
>be
>> >able to reacquire the handle to our stateful session bean and call
>it
>> >from the secondary client.
>> >
>> >
>> >Justin
>> >
>> >"Mike Reiche" <[email protected]> wrote in message
>news:<[email protected]>...
>> >> You should be using an entity bean, not a stateful session bean
>for
>> >this application.
>> >>
>> >> A stateful session bean is intended to be keep state (stateful)
>for
>> >the duration
>> >> of a client's session (session).
>> >>
>> >> It is not meant to be shared by different clients - in fact, if
>you
>> >attempt to
>> >> access the same stateful session bean concurrently - it will throw
>> >an exception.
>> >>
>> >> We did your little trick (storing/retrieving handle) with a stateful
>> >session bean
>> >> on WLS 5.1 - and it did work properly - not as you describe. Our
>sfsb's
>> >were not
>> >> replicated as yours are.
>> >>
>> >> Mike
>> >>
>> >> [email protected] (Justin Meyer) wrote:
>> >> >I am trying to access the same stateful session bean from multiple
>> >> >clients. I also want this bean to have failover support so we want
>> >to
>> >> >deploy it in a cluster. The following description is how we have
>tried
>> >> >to solve this problem, but it does not seem to be working. Any
>> >> >insight would be greatly appreciated!
>> >> >
>> >> >I have set up a cluster of three servers. I deployed a stateful
>> >> >session bean with in memory replication across the cluster. A client
>> >> >obtains a reference to an instance of one of these beans to handle
>> >a
>> >> >request. Subsequent requests will have to use the same bean and
>could
>> >> >come from various clients. So after using the bean the first client
>> >> >stores the handle to the bean (actually the replica aware stub)
>to
>> >be
>> >> >used by other clients to be able to obtain the bean. When another
>> >> >client retrieves the handle gets the replica aware stub and makes
>> >a
>> >> >call to the bean the request seems to unpredictably go to any of
>the
>> >> >three servers rather than the primary server hosting that bean.
>If
>> >the
>> >> >call goes to the primary server everything seems to work fine the
>> >> >session data is available and it gets backed up on the secondary
>> >> >server. If it happens to go to the secondary server a bean that
>has
>> >> >the correct session data services the request but gives the error
>> >> ><Failed to update the secondary copy of a stateful session bean
>from
>> >> >home:ejb20-statefulSession-TraderHome>. Then any subsequent requests
>> >> >to the primary server will not reflect changes made on the secondary
>> >> >and vice versa. If the request happens to go to the third server
>that
>> >> >is not hosting an instance of that bean then the client receives
>an
>> >> >error that the bean was not available. From my understanding I
>thought
>> >> >the replica aware stub would know which server is the primary host
>> >for
>> >> >that bean and send the request there.
>> >> >
>> >> >Thanks in advance,
>> >> >Justin
>>
>
>
-
Saving string from multiple clients on a server data structue
I have a server which receives updates from multiple clients ( in this example, football scores which are updated periodically by the clients.)
When the server receives the scores it needs to store them and at certain time intervals send the complete list of scores to multiple terminals at various locations.
I am approaching this task in stages...
stage 1.
..create the clients and server ...test the clients can send the data and the server can receive the data and output to screen..
this is completed
stage 2...
a/ on the server side store the received scores in a data structure (ArrayList<String> is what I'm thinking.)
b/ periodically output all scores to the screen (maybe every 30 seconds) and empty the ArrayList..am looking at the Timer class for this part..
stage 3
create the monitors and output scores to monitors periodically..
======================================================
right now I'm at stage 2a ie trying to store the received scores in a data structure.
i've created a method saveScore in the StoreScore class which is called by the StoreScore run method...
The saveScore method creates an ArrayList and adds the score to it...
Question
does every thread create a new instance of storedScores and therefore the scores are stored in a multitude of data structures?
I think the answer is yes and if so then this is not the solution...
What I'm thinking is , as all scores can be outputted to the server screen via System.out.println, is there not a way of saving all these scores in a single data structure?
The code below is the server code..
any advice much appreciated....thank you
/*=============================================================== */
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.*;
class ScoresServer1{
final static int portNum = 1234; // any number > 1024
final static int numThreads = 10;
static ExecutorService pool;
public static void main(String[] args){
pool = Executors.newFixedThreadPool(numThreads);
System.out.println("Server running ...");
try{
ServerSocket servesock = new ServerSocket(portNum);
// for service requests on port
while (true){
// wait for a service request on port portNum
Socket socket = servesock.accept();
// submit request to pool
pool.submit(new StoreScore(socket));
}catch(IOException e){}
class StoreScore implements Runnable {
BufferedReader reader;
Socket sock;
public StoreScore(Socket clientSOcket) {
try {
sock = clientSOcket;
InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(isReader);
} catch (Exception ex) { ex.printStackTrace(); }
public void run() {
String message;
try {
while ((message = reader.readLine()) != null) {
// System.out.println("latest score: " + message);
saveScore(message);
} catch (Exception ex) { ex.printStackTrace(); }
public void saveScore(String message){
ArrayList<String> storedScores = new ArrayList<String>();
storedScores.add(message);
Iterator<String> t = storedScores.iterator();
while(t.hasNext()){
String s = t.next();
System.out.println(s);
}does every thread create a new instance of storedScores and therefore the scores are stored in a multitude of data structures?
I think the answer is yes and if so then this is not the solution...The answer is yes. However, threads can share data, if they were properly synchronized. You should read the threading tutorial before creating a lot of hard to debug mistakes.
[http://java.sun.com/docs/books/tutorial/essential/concurrency/] -
How to handle multiple clients with DatagramSocket
I am trying to handle multiple clients with 1 datagramSocket bind to one port (basically I have only one port to use, and I can not use TCP or any other ports). At the server side I have two threads one for receiving packets and buffering them, another for processing the packets in the buffer and sending replies.
I can have multiple clients sending datagramPackets to me and I will have to process the packets and send them to DIFFERENT clients. Ex. Client 1 sends datagramPacket to Server which sends the processed packet to Client 2. Also Client 2 sends a datagramPacket to Server which again processes the packet and sends it to Client1. May have Client 3 and 4 doing the same thing at the same time... and so on...
My root class is creating the datagramSocket(somePort) and two threads (receiver and sender). How can I use the socket that I created in these two threads??
I have done the following and I am getting "java.net.bindexception". When I am sending stuff from Client1 to Client2 everything is fine but when I start sending something from Client2 to Client 1, I get the bindexception... Client 1 is using port 3000, Client 2 is using port 4000.
I really don't have a lot of experience in socket programming so I am not sure if there is a much simpler way to do this. I appreciate all the tips and help that I can get...
Thanks...
class UDP_serv
static DatagramSocket udpSocket;
final static int SERVER_PORT = 2000;
public static void main(String[] args) throws SocketException
udpSocket= new DatagramSocket(SERVER_PORT);
new DataReceiver().start ();
new DataSender().start ();
static class DataReceiver extends Thread
DataReceiver()
Thread.currentThread().setName("DataReceiver");
public void run()
while (true)
byte pckt[] = new byte [MaxMsgSize];
DatagramPacket dp = new DatagramPacket (pckt, pckt.length);
try
udpSocket.receive (dp);
//PUSH TO RECEIVE BUFFER
catch(Exception e)
e.printStackTrace();
static class DataSender extends Thread
DataSender()
Thread.currentThread().setName("DataSender");
public void run()
while (true)
processDataMsg();
static void processDataMsg()
DatagramPacket op;
InetAddress DA = null;
int DP = 0;
byte [] outPacket = null;
// POP FROM RECEIVE BUFFER
// SOME PROCESSING HERE
// Set Destination Address (DA)
// Set Destination Port (DP)
// DA and DP are the forwarding IP and Port addresses
// not the addresses original packet was sent from.
try
op = new DatagramPacket (outPacket, outPacket.length,DA, DP);
udpSocket.send(op);
catch (IOException e)
e.printStackTrace();
}Also for development and testing purposes, I am running the two clients and the server on the same machine (windows xp-32b) so all of the Destination IP Addresses are 127.0.0.1. and as I said Ports that I am using are 2000, 3000, 4000 (Server, Client1, Client2).Hmm I have minimized the code and it seems to be working now.
I think I have an error in the header portion of the data I am sending, where I am storing the source IP/Port and destination IP/Port. I think the server in the middle is messing these values up while sending them to the destination Client. Because the destination client actually receives the stuff and sends the reply back to the server, but the reply packet's headers has 0/0 as the dest IP / Port...
Server is giving me java.net.BindException: Cannot assign requested address error when it tries to forward the reply it received from the client2 as the address it is trying to send is 0!
I guess it doesnt just give this error when you try to open two sockets to the same port...
Paul, Thanks for the direction on how to proceed... took me a while get the minimized code but at least figured out the problem. Well still have to make sure that is THE problem though :)
As far as the statics goes how can I change those to non static ones? Where do I make an instance of the top level class that creates the threads? and how do I pass the DatagramSocket to the threads/ if I dont need to pass how do I call or use the datagramSocket I created in the top level class? I mean do I still kinda have it like a global variable on the top?? A very simple example would be much appreciated...
I think these might be really basic questions but I am having a rough time with the hierarchy in java...
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