Using Oracle Coherence

Hi All,
I have a query for ORacle Coherence(i am new to this product).
I have my application built in java(J2EE).I want to go for coherence for better performence. So one thing i would be required is to install the coherence for all the servers which will be participating.
Will there be any changes in code to use coherence. How application will know how to use coherence.
Pls suggest
Rajiv

Rajiv,
I would suggest start with reading the Coherence Overview here:
http://wiki.tangosol.com/display/COH33UG/Coherence+3.3+Home
Regards,
Gene

Similar Messages

How to Use Oracle Coherence in BPEL 11g

i have a scenario to cache the results some where, so that i can make use of the same for the same request.
I hope this can be done using Oracle Coherence. Could you please let me know how can i use this coherence for cacheing in BPEL 11g (in my bpel process)
thanks for the help in advance.

Hi.
U can use the Coherence API within a Spring bean.
Take a look at this https://blogs.oracle.com/jaylee/entry/accessing_coherence_cluster_using_spring
That's one way to do it.
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How can i use oracle coherence with JPA/ejb in web service?

Hi
I want to make web service using JPA which calls oracle XE via oracle coherence? i want to use JAX-ws? i searched and found you can make and deployed it using web logic but is there any other way i can make it and deployed in tomcat. i want to use oracle coherence + Oracle XE + JAX-WS? if it possible how can i other wise what are other ways i can do it?
please any one does know it reply please it helps me lot to get.
Thanks in advance,
Edited by: 913837 on Feb 22, 2012 3:51 PM

If you want data cached in Coherence to find it's way into an Oracle database for persistence, then look at the "CacheStore" section of the Coherence Developer Guide. This also works the other way round too, in that you can get data read into a Coherence cache via a database read. Again, look in the Coherence Developer Guide.
If you want you applications "entry point" into a piece of code to be a web-service, then Tomcat+CXF will work just fine. Once you are in the service, just use the Coherence API to put the data in a cache.
But also look at the HTTP access offered in later versions of Coherence in the form of REST. This may save you the Tomcat+CXF install, depending upon your needs. See the Coherence Client Guide.
Still, what exactly are you trying to achieve here? It's not clear from your post why a web service using JPA for persistence needs to go via Coherence at all. More info needed.
Cheers,
Steve

Disadvantages of using Oracle Coherence

We are using EclipseLink JPA implementation for data-access and the size of data is small.
Mostly, optimizing the JPA code and using second level cache should improve the performance of reading/writing data from database.
After going through the tutorial and leaning about Coherence, very much willing to go for it.
Although, don't know what are the disadvantages of using Coherence. Any suggestions?
Thank you for your help.

Some backgroung information on second-level caching can be found here: http://middlewaremagic.com/weblogic/?p=5407
Note that it discusses Hibernate, but it is applicable to every ORM framework.
When using a second-level cache the performance gain is had when the data is read-mostly (or even better reference data)
There are some consequences of cache aside that should be kept in mind:
- If multiple threads require access to the same piece of data that is not in the
cache, it may result in multiple redundant reads to the database.
- When an application writes directly to the database, concurrency concerns
are handled by the database, whether via optimistic or pessimistic locking.
When writing to a cache in memory, data integrity must be maintained via
some explicit concurrency control mechanism.
Coherence provides the following tools:
- Distributed concurrency control, either through the use of distributed locking
using the ConcurrentMap API or optimistic updates using EntryProcessor
using the InvocableMap API.
- Coherent consistent view of the data from any JVM in a cluster.
Although Coherence provides these tools to ease the implementation of a distributed
cache-aside solution, it also provides tools that enable much more efficient and
easier-to-implement persistence patterns. (http://middlewaremagic.com/weblogic/?p=5954)

Using EclipseLink or JPA with Oracle Coherence as shared cache

Hi,
I expect to use EclipseLink with Oracle Coherence as shared cache, mainly with/for Entity Caching.
* JPA)
For JPA queries, is the JPA semantics fully preserved when using Oracle Coherence ?
* Non-JPA)
Are the non-JPA API taking also advantage from Oracle Coherence ?
For these non-JPA queries, is the semantics fully preserved when using Oracle Coherence ?
Regards,
Dominique
PS: I hope this is the right forum to ask my questions.
Otherwise, could you tell me what is the right forum ?
Thanks.

Yes, JPA semantics are fully preserved when using TopLink-Grid to cache entities within Coherence.
Yes, the native EclipseLink APIs can also take advantage of TopLink-Grid and Coherence.
I am not sure what you mean by "For these non-JPA queries, is the semantics fully preserved when using Oracle Coherence ?" Perhaps you can provide an example of what you are looking for?
--Gordon

Oracle Coherence Examples with Oracle SOA suite 11.1.1.4.0 and JDeveloper.

Hi,
I am new to Oracle Coherence. I was looking for examples implementing Oracle Coherence step by step so as to get a basic understanding using JDeveloper but most of the examples available are using Oracle Service Bus and Eclipse.
Could anyone please help me in providing link with examples using Oracle Coherence with Oracle SOA suite 11.1.1.4.0 and JDeveloper.
Thanks for the needful.
Cheers,
Varun

Hi Varun,
Please find the answers to your questions below:
1) Could you please let me know how to use this system property -Dtangosol.coherence.override in my application so that I can coordinate between the cluster used by my application and the one started for using Coherence Node.
You need to specify this property in the Java Options of your server or cache node startup script.
2) I was trying to understand how to use this tangosol-coherence-override.xml but the document is pretty confusing. I am not able to understand that whether I am suppose to use it at server level or at application level.
I would suggest extract the coherence.jar and you it would be important for you to have a look at the tangosol-coherence.xml and tangosol-coherence-override.xml. This file is used to override any of the properties specified in tangosol-coherence.xml for your cluster configuration for example, clustername, multicast ip and port or WKA for unicast, logging and so on.
3) Another point is how to coordinate among tangosol-coherence-override.xml, coherence-cache-config.xml and -Dtangosol.coherence.override system property from my application
Ideally you should specify in the java options of your application startup but you can also sepcify using System.setProperty("property", "value") in you code for specifying the various properties
4) How to use the cache updating mechanisms from an application?
I am not clear what do you mean by cache updating mechanisms? If you mean how you can update the cache from application then you can use simple Put, Entry Processor and so on. Refer NamedCache APIs to start with for operations but there many other ways to update the cache from within application or otherwise
Hope this helps!
Cheers,
NJ

Oracle Coherence database sync while table refresh

Hello,
I am using Oracle Coherence to cache a database table for read only puposes. However, my question is that this table needs to be fully refreshed every night and during this time I want to retain the cache in Oracle Coherence and do not want it to be recycled as well since it has to be available 24X7. Is there a way to do that? I am thinking of using a custom CacheStore class that will have its own local cache of the table or the other approach will be to look up in the shadow table while the primary table is being refreshed? Are there any other optimum ways to do this? The primary consideration for me is fast response.
Any help will be appreciated.
Thanks,
Jay

Hi Jay,
No, I am not suggesting to stop or start the JVMs. Everything will continue run as it was running ...
The Nightly refresh process that loads the data will load in non-active version of the cache (dataCache). Once the load is completed, it will update the MarkerCache (markerCache) with this version. All the client requests will follow something like this:
//Lookup in markerCache which version of the data cache is active
NamedCache markerCache=CacheFactory.getCache("markerCache");
String str=markerCache.get("dataCacheName");
//The cache which has the refreshed and updated data (dataCachev1 or dataCachev2)
NamedCache dataCache=CacheFactory.getCache(str);
For the nightly refresh process, you will do something like this:
NamedCache markerCache=CacheFactory.getCache("markerCache");
String str=markerCache.get("dataCacheName");
if ("dataCachev1".equals(str)){
       NamedCache newDataCache=CacheFactory.getCache("dataCachev2");
       //load the data{ }
       //update the marker Cache with this newly loaded cache; from now on the client will start using this newly loaded cache
       markerCache.get("dataCacheName","dataCachev2");
       // wait for few minutes to let all the old request complete
       //destroy the old cache
       CacheFactory.getCache("dataCachev1").destroy();
} else{
    //do the reverse for dataCachev1 and dataCachev2
}The only thing you need to note is that there might still be some requests using the dataCachev1 when it is destroyed so you need to handle the exception gracefully at the client application.
Please note, that you should optimize the code to minimize the time spent in lookup of the markerCache by using Maplisteners as appropriate.
Hope this helps!
Cheers,
NJ

How to put the data into cache and distribute to nodeusing oracle coherence

Hi Friends,
i am having some random number data writing into file,from that file i am reading the data and i want to put into cache,how can i put the data into cache and partition this data into different nodes ( machines) to caluculate like S.D,variance..etc..like that.(or how can i implement montecarlo using oracle coherence) if any one know plz suggest me with flow.
Thank you.
regards
chandra

Hi robert,
i have some bulk data in some arraylist or object format,i want to put into cache.
i am not able to put into cache.i am using put method like cache.put(object key ,object value) ,but its not allowing to put into cache.
can you please help me.i m sending my code.plz go thru and tel me whr i did mistake.
package lab3;
import com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;
import com.tangosol.net.cache.NearCache;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Scanner;
import javax.naming.Name;
public class BlockScoleData {
     * @param args
     * s=The spot market price
     * x=the exercise price of the option
     * v=instantaneous standard deviation of s
     * r=risk free instantaneous rate of interest
     * t= time to expiration of the option
     * n – Number of MC simulations.
     private static String outputFile = "D:/cache1/sampledata2.txt";
private static String inputFile = "D:/cache1/sampledata2.txt";
NearCache cache;
List<Credit> creditList = new ArrayList<Credit>();
     public void writeToFile(int noofsamples) {
          Random rnd = new Random();
          PrintWriter writer = null;
          try {
               writer = new PrintWriter(outputFile);
               for (int i = 1; i <= noofsamples; i++) {
                    double s = rnd.nextInt(200) * rnd.nextDouble();
                    //double x = rnd.nextInt(250) * rnd.nextDouble();
                    int t = rnd.nextInt(5);
                    double v = rnd.nextDouble() ;
                    double r = rnd.nextDouble() / 10;
                    //int n = rnd.nextInt(90000);
                    writer.println(s + " " + t + " " + v + " "
                              + r );
          } catch (FileNotFoundException e) {
               e.printStackTrace();
          } finally {
               writer.close();
               writer = null;
public List<Credit> readFromFile() {
Scanner scanner = null;
Credit credit = null;
// List<Credit> creditList = new ArrayList<Credit>();
try {
scanner = new Scanner(new File(inputFile));
while (scanner.hasNext()) {
credit = new Credit(scanner.nextDouble(), scanner.nextInt(),
scanner.nextDouble(), scanner.nextDouble());
creditList.add(credit);
System.out.println("read the list from file:"+creditList);
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
scanner.close();
credit = null;
scanner = null;
return creditList;
// public void putCache(String cachename,List<Credit> list){
// cache = CacheFactory.getCache ( "VirtualCache");
// List<Credit> rand = new ArrayList<Credit>();
public Object put(Object key, Object value){
cache = (NearCache)CacheFactory.getCache("mycache");
String cachename = cache.getCacheName();
List<Credit> cachelist=new ArrayList<Credit>();
// Object key;
//cachelist = (List<Credit>)cache.put(creditList,creditList);
cache.put(creditList,creditList);
System.out.println("read to the cache list from file:"+cache.get(creditList));
return cachelist;
     public static void main(String[] args) throws Exception {
     NearCache cache = (NearCache)CacheFactory.getCache("mycache");
          new BlockScoleData().writeToFile(20);
     //new BlockScoleData().putCache("Name",);
          System.out
                    .println("New file \"myfile.csv\" has been created to the current directory");
     CacheFactory.ensureCluster();
     new BlockScoleData().readFromFile();
System.out.println("data read from file successfully");
     List<Credit> creditList = new ArrayList<Credit>();
new BlockScoleData().put(creditList,creditList);
     System.out.println("read to the cache list from file:"+cache.get(creditList));
//cache=CacheFactory.getCache("mycache");
//mycacheput("Name",new BlockScoleData());
//     System.out.println("name of cache is :" +mycache.getCacheName());
//     System.out.println("value in cache is :" +mycache.get("Name"));
//     System.out.println("cache services are :" +mycache.getCacheService());
regards
chandra

Oracle Coherence and OSB caching

Hi Guys,
I have a few queries regarding Oracle Coherence.
1. Is OSB business Service Caching internally uses Oracle Coherence.
2. If answer to above question is YES, then can I install Weblogic without Oracle Coherence.
3. Again if answer to above question is YES, will OSB caching work without Oracle Coherence and if yes, then How?
4. Can we create clustered weblogic domain without oracle coherence.
Regards

Thanks Durga/Abhinav,
The links clarify a lot.
Now what i need to know more is that when i installed Weblogic server (default configuration) and created a OSB server as managed server in wls domain. I could use the OSB caching in business services without any issue. However, there is no coherence server under "Coherence Server" in weblogic console. How the caching is working in OSB when i havn't configured any coherence server on weblogic?
Regards

Oracle Coherence data update

Hi,
I have one application already using Oracle coherence situated on server X.
My other application is situated on server Y.
cache hold around 1 million records.
I want to use cache in my application on server Y , and it should be in synch with cache on server X.
It can be updated on timely basis.
what could be efficient way to achieve this ?

Can you use coherence in server Y? If so, consider using near cache with local cache as a front map and correct invalidation strategy. It will cache only subset of records while allow server Y to get updated cached entries as the objects in server X change. http://coherence.oracle.com/display/COH34UG/Near+Cache

Oracle Coherence increasing Swap Utilization

We are using Oracle Coherence on linux servers. However, we noticed that because of Coherence processes running, often our swap utilization % increases too much, sometimes becoming more than 98%, even touched 100% a few times.
Once we kill all the coherence related processes, then it becomes normal.
Is there any way we can make coherence processes to only use a particular size of Swap space ?
Currently increasing swap space is not in our scope.
Please suggest.
Edited by: user7761515 on May 3, 2012 11:29 AM

Hi,
We are using Oracle Coherence on linux servers. However, we noticed that because of Coherence processes running, often our swap utilization % increases too much, sometimes becoming more than 98%, even touched 100% a few times.
Swapping itself (1%-100%) is not a good sign and should be avoided by ensure that you have sufficient memory such that you are not making active use of swap space on your machines. The active usage of SWAP space will have significant performance degradation.
Is there any way we can make coherence processes to only use a particular size of Swap space ?Manage your memory by allocating heap using -Xmx for Coherence JVMs. You need to ensure that the sufficient RAM memory is available on the server for Coherence JVMs and other operating system processes and do not consume all the RAM.
To temporarily set the swappiness, as the root user echo a value onto /proc/sys/vm/swappiness. The following command will set swappniess to 0:
echo 0 >/proc/sys/vm/swappiness //To set the value permanently, modify the /etc/sysctl.conf file.
Hope this helps!
Cheers,
NJ

Can I use multiple coherence instances on one JVM?

Or can I explicitly designate a tangosol-coherence-override.xml to coherence? If I can, how to?
Thanks.
Edited by: user8028833 on May 31, 2010 1:35 AM

OK apologies as I was going to just post the bits of code but I didn't get much time last night.
This code was originally written by a couple of us who wrote some security and single sign on code for Coherence. The project is on Google Code here: http://code.google.com/p/coherence-security/
The source is a Maven project so it follows the Maven directory structure. If you look in the coherence-security-core test sources there is a package called com.oracle.coherence.patterns.security.test.starter which contains all the ClassLoader code and classes to start a Coherence "cluster" in a single JVM.
The com.oracle.coherence.patterns.security.ApacheDirectoryTest test class uses this code to start a cluster to run its unit tests. To start the cluster you call CoherenceClusterStarter.getInstance() for example the com.oracle.coherence.patterns.security.ApacheDirectoryTest testSecureClientWithUnauthorisedCredentials() method.
    @Test
    public void testSecureClientWithUnauthorisedCredentials() throws Throwable {
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        System.setProperty("coherence.incubator.mainclass", SecureSandboxStarter.class.getName());
        // Make sure the cluster members run with the [email protected] Principal
        System.setProperty("sun.security.krb5.principal", "[email protected]");
        CoherenceClusterStarter.getInstance();
        // Run the client as the Thomas the Tank identity ([email protected]) which is
        // not authorised to connect as an Extend client in the extend-permissions.xml file
        System.setProperty("sun.security.krb5.principal", "[email protected]");
        LoginContext lc = new LoginContext("Coherence");
        lc.login();
        Subject subject = lc.getSubject();
        try {
            Subject.doAs(subject, new PrivilegedExceptionAction<Object>(){
                public Object run() throws Exception {
                    SystemPropertyLoader.loadEnvironment("client");
                    System.setProperty("tangosol.coherence.security", "true");
                    CacheFactory.getCache("test");
                    return null;
            fail("Expected to have a PortableException wrapping a java.lang.SecurityException thrown");
        } catch (PortableException e) {
            assertEquals("Portable(java.lang.SecurityException)", e.getName());
    }In the code above the first line sets the coherence.incubator.mainclass System property to the name of the class that will be run (in this case our secured DefaultCacheServer wrapper). Then the next line starts the psuedo-Cluster which the rest of the code uses.
Note
The Google Code above was originally done due to a requierment to secure Coherence using Active Directory (Kerberos). The code was started on 3.4 and eventually on 3.5.3 and then used to help Oracle change the Security API for 3.6. There are a few things not quite right and a few "gotchas" that are not in the code online.
Anyone is welcome to take it and use it but I and the others who worked on it offer no warranty or guarantee it will work for you.
As of Coherence 3.6 there are much simpler ways to do security - although if you want to use Active Directory or Kerberos some of the code on Google will still be useful.
Any problems or questions give me a shout either here or mail [email protected].
Regards
JK

Oracle Coherence 3.7.1, It's always creating a new cluster in linux m/c.

Hi ,
I am facing an issue with Oracle Coherence 3.7.1 in linux m/c , where it’s always creating a new cluster, even if I start a new member provided with same cluster name as argument. -Dtangosol.coherence.cluster=name
It’s not joining the existing cluster , it’s always creating a new cluster with same name in Linux m/c.
But when I tried the same thing in windows m/c , it working fine , even If I start N number cache server’s it joining the same cluster as one more member.
Please someone help me, why it’s always creating a new cluster in linux m/c with same name ? why new VM’s are not joining the existing cluster? , Is there anything extra setup I need to do for Linux m/c.
Thanks in Advance.
<coherence>
<cluster-config>
<member-identity>
<cluster-name>My_cluster</cluster-name>
</member-identity>
</cluster-config>
<configurable-cache-factory-config>
<init-params>
<init-param>
<param-type>java.lang.String</param-type>
<param-value system-property="tangosol.coherence.cacheconfig">coherence-cache-config.xml</param-value>
</init-param>
</init-params>
</configurable-cache-factory-config>
</coherence>
12-10-01 10:20:06.544/0.420 Oracle Coherence 3.7.1.0 <Info> (thread=main, member=n/a): Loaded operational configuration from "jar:file:/data/Informatica/nas/sdgshared/MyApputils/coherence/lib/coherence.jar!/tangosol-coherence.xml"
2012-10-01 10:20:06.608/0.484 Oracle Coherence 3.7.1.0 <Info> (thread=main, member=n/a): Loaded operational overrides from "jar:file:/data/Informatica/nas/sdgshared/MyApputils/coherence/lib/coherence.jar!/tangosol-coherence-override-dev.xml"
2012-10-01 10:20:06.609/0.485 Oracle Coherence 3.7.1.0 <Info> (thread=main, member=n/a): Loaded operational overrides from "jar:file:/data/Informatica/nas/sdgshared/MyApputils/coherence/MyAppCache/lib/MyAppCoherenceCache.jar!/tangosol-coherence-override.xml"
2012-10-01 10:20:06.613/0.489 Oracle Coherence 3.7.1.0 <D5> (thread=main, member=n/a): Optional configuration override "/custom-mbeans.xml" is not specified
Oracle Coherence Version 3.7.1.0 Build 27797
Grid Edition: Development mode
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
2012-10-01 10:20:06.831/0.707 Oracle Coherence GE 3.7.1.0 <Info> (thread=main, member=n/a): Loaded cache configuration from "file:/data/Informatica/nas/sdgshared/MyApputils/coherence/MyAppCache/config/coherence-cache-config.xml"; this document does not refer to any schema definition and has not been validated.
2012-10-01 10:20:07.328/1.204 Oracle Coherence GE 3.7.1.0 <D4> (thread=main, member=n/a): TCMP bound to /10.176.4.105:8088 using SystemSocketProvider
2012-10-01 10:20:10.711/4.587 Oracle Coherence GE 3.7.1.0 <Info> (thread=Cluster, member=n/a): Created a new cluster "MyCache_cluster" with Member(Id=1, Timestamp=2012-10-01 10:20:07.397, Address=10.176.4.105:8088, MachineId=44371, Location=site:,machine:ctrel9014-12,process:19922, Role=CoherenceServer, Edition=Grid Edition, Mode=Development, CpuCount=16, SocketCount=4) UID=0x0AB004690000013A1CE9ADE5AD531F98
2012-10-01 10:20:10.713/4.589 Oracle Coherence GE 3.7.1.0 <Info> (thread=main, member=n/a): Started cluster Name=MyCache_cluster
Group{Address=224.3.7.0, Port=37000, TTL=4}
MasterMemberSet(
ThisMember=Member(Id=1, Timestamp=2012-10-01 10:20:07.397, Address=10.176.4.105:8088, MachineId=44371, Location=site:,machine:ctrel9014-12,process:19922, Role=CoherenceServer)
OldestMember=Member(Id=1, Timestamp=2012-10-01 10:20:07.397, Address=10.176.4.105:8088, MachineId=44371, Location=site:,machine:ctrel9014-12,process:19922, Role=CoherenceServer)
ActualMemberSet=MemberSet(Size=1
Member(Id=1, Timestamp=2012-10-01 10:20:07.397, Address=10.176.4.105:8088, MachineId=44371, Location=site:,machine:ctrel9014-12,process:19922, Role=CoherenceServer)
MemberId|ServiceVersion|ServiceJoined|MemberState
1|3.7.1|2012-10-01 10:20:10.711|JOINED
RecycleMillis=1200000
RecycleSet=MemberSet(Size=0
TcpRing{Connections=[]}
IpMonitor{AddressListSize=0}
2012-10-01 10:20:10.736/4.612 Oracle Coherence GE 3.7.1.0 <D5> (thread=Invocation:Management, member=1): Service Management joined the cluster with senior service member 1
2012-10-01 10:20:10.918/4.794 Oracle Coherence GE 3.7.1.0 <D5> (thread=DistributedCache:HBaseMyCache, member=1): Service HBaseMyCache joined the cluster with senior service member 1
2012-10-01 10:20:10.942/4.818 Oracle Coherence GE 3.7.1.0 <Info> (thread=main, member=1):
Edited by: user10092089 on Oct 2, 2012 8:35 AM

Hi,
For unicast, you need to define the override file as under:
<?xml version='1.0'?>
<coherence>
     <cluster-config>
          <member-identity>
               <cluster-name system-property="tangosol.coherence.cluster">LPACache_cluster</cluster-name>
          </member-identity>
          <unicast-listener>
              <well-known-addresses>
               <socket-address id="1">
                   <address system-property="tangosol.coherence.wka1">coherence-node1-ip</address>
                   <port system-property="tangosol.coherence.wka1.port"> coherence-node1-port</port>
               </socket-address>
               <socket-address id="2">
                   <address system-property="tangosol.coherence.wka2"> coherence-node2-ip </address>
                   <port system-property="tangosol.coherence.wka2.port"> coherence-node2-port</port>
               </socket-address>
              </well-known-addresses>
          <port-auto-adjust system-property="tangosol.coherence.localport.adjust">false</port-auto-adjust>
          </unicast-listener>
     </cluster-config>
     <configurable-cache-factory-config>
           <class-name>com.tangosol.net.DefaultConfigurableCacheFactory</class-name>
           <init-params>
              <init-param>
                  <param-type>java.lang.String</param-type>
                  <param-value system-property="tangosol.coherence.cacheconfig">coherence-cache-config.xml</param-value>
              </init-param>
          </init-params>
    </configurable-cache-factory-config>
    <logging-config>
           <severity-level system-property="tangosol.coherence.log.level">5</severity-level>
           <character-limit system-property="tangosol.coherence.log.limit">0</character-limit>
    </logging-config>
</coherence>Use the property -Dtangosol.coherence.localhost=coherence-node1-ip and -Dtangosol.coherence.localport=coherence-node1-port for coherence server1 and -Dtangosol.coherence.localhost=coherence-node2-ip and -Dtangosol.coherence.localport=coherence-node2-port for Coherence server 2. Once you start the servers with these changes, you should not see the below message:
Group{Address=224.3.7.0, Port=37000, TTL=4}
HTH
Cheers,
_NJ

What are the prerequisites to install and configure Oracle Coherence 3.4

What are the prerequisites to install and configure an Oracle Coherence (3.4 Grid version) on RHEL5.0 system?
I want to make an Oracle Coherence Gid Data system for testing purpose using 3 machines.
What kind of network configuration is OK?
What software should be installed in advance？
Thank you

Hi,
I would read through the Testing and Tuning section of the following page.
http://coherence.oracle.com/display/COH34UG/Usage+(Full)
Even though you are not about to go into production I think the Production Checklist has some very useful information.
http://coherence.oracle.com/display/COH34UG/Production+Checklist
-Dave

Is there any product that is same as oracle coherence but is open source?

I donot know if it is suitable to post this question here, but I really want to know it, so please help me~
Is there any product that has same function as oracle coherence but is open source?

You may have a look at for instance JBoss Cache. It does however (as far as I know) lack Coherence most useful (and powerful) caching architectures (i.e. "partitioned" and "near" caches). Nor do I belive you should expect the same level of stability or proven track record for use in demanding applications as coherence has.
This said I think it can be a perfectly useful product for some applications were you don't need the most advanced features and don't have the budget for Coherence or some other commercial product - it is after all a lot better than writing your own project specific caching solution...
/Magnus

Using Oracle Coherence

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