Space occupied by clustered index Vs non-clustered index

I am trying to understand the indexes. Does clustered index occupy more space than a non-clustered index because it carries the information about rest of the other columns also. Could you guys please help me understand this. Thanks in advance.
svk

Hi czarvk,
Clustered index in SQL Server takes up more space than non-clustered indexes.
Clustered index arranges the way records are stored in a table putting them in order (key, value), all the data are sorted on the values of the index.
A non-clustered index is a completely different object in a table, containing only a subset of columns and a row locator to the table’s rows or to the clustered index’s key.
So clustered index in SQL Server takes up more space than non-clustered indexes.
If you have any question, please feel free to let me know.
Regards,
Donghui Li

Similar Messages

Unique index vs non-unique index

Hi Gurus,
I'm getting lots of "TABLE ACCESS FULL" for lots of columns which have non-unique indexes is some queries. So my question is does optimizer does not pick up non-unique index but only pickes up unique indexes for those columns.
Thanks
Amitava.

amitavachatterjee1975 wrote:
Hi Gurus,
I'm getting lots of "TABLE ACCESS FULL" for lots of columns which have non-unique indexes is some queries. So my question is does optimizer does not pick up non-unique index but only pickes up unique indexes for those columns.
Thanks
Amitava.WHY MY INDEX IS NOT BEING USED
http://communities.bmc.com/communities/docs/DOC-10031
http://searchoracle.techtarget.com/tip/Why-isn-t-my-index-getting-used
http://www.orafaq.com/tuningguide/not%20using%20index.html

What is RID in non clustered index and its use

Hi All,
I need help regarding following articles on sql server
1) what is RID in non clustered index and its use.
2) What is Physical and virtual address space. Difference in 32 bit vs 64 bit Virtual address space
Regards
Rahul

Next time Please ask single question in a thread you will get better response.
1. RID is location of heap. When you create Non clustered index on heap and
lookup happens to get extra records RID is used to locate the records. RID is basically Row ID. This is basic definition for you. Please read
this Thread for more details
2. I have not heard of Physical address space. I Know Virtual address space( VAS)
VAS is simple terms is amount of memory( virtual ) 'visible' to a process, a process can be SQL Server process or windows process. It theoretically depends on architecture of Operating System. 32 bit OS will have maximum range of 4 G VAS, it's calculated
like a process ruining on 32 bit system can address max up to 2^32 locations ( which is equivalent to 4 G). Similarly for 64 bit max VAS will be 2^64 which is theoretically infinite. To make things feasible maximum VAS for 64 bit system is kept to 8 TB. Now
VAS acts as layer of abstraction an intermediate .Instead of all request directly mapping to physical memory it first maps to VAS and then mapped to physical memory so that it can manage request for memory in more coordinated fashion than allowing process
to do it ,if not it will soon cause memory crunch.Any process when created on windows will see virtual memory according to its VAS limit.
Please read
This Article for detailed information
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP

Non Clustered Indexing not working for SQL server 2005

I have create two non clustered index on two particular tables. Now the problem is its working fine..but after restarting my server its working stop and then again I have to delete that index and recreate it.

try these links
http://blog.sqlauthority.com/2009/02/07/sql-server-introduction-to-force-index-query-hints-index-hint/
http://blog.sqlauthority.com/2009/02/08/sql-server-introduction-to-force-index-query-hints-index-hint-part2/
http://www.brentozar.com/archive/2013/10/index-hints-helpful-or-harmful/
Hope it Helps!!

Transactional Replication: Non-Clustered Indexes not copying.

Hello,
I set up replication on our servers at work to streamline some procedures we run daily/weekly on them.
This copies around 15 articles from two databases on the "Master" server to another server used for execution purposes. For the most part it was a pretty straight forward task and it seemed to work nicely; but I realised after some investigation that the
non-clustered indexes weren't copying over to the child server.
I set the non-clustered indexes property in the properties of the publishing articles to "True" and generated a new snapshot, this seemed to work, but I've come into work this morning to find the property has reset to "False" and I have no indexes on the
table again. Why is this happening and is there any way I can resolve the matter so the indexes are copied over concurrently?
Thanks in advance for your advice.
JB

I actually solved this.
You can use a post-replication SQL script to create the indexes. Whatever articles you're publishing open up the indexes drop down list of the article in object explorer, right-click on an index and hover over Script Index as, then Create-to, then click
New Query Window editor.
Up will pop up a new query window with the resulting index. Work your way through all the indexes on all the articles of the publication, copy and pasting just the create index line and below of each script, pull them all together into one query window.
Once you're done find a safe folder somewhere on your harddrive and save the SQL query as an .sql file with a sensible name.
Right click on the publication and goto properties. Click on the "Snapshot" tab, in there; there should be a section saying "Run additional scripts". Choose the browse button next to "After applying the Snapshot; execute this script:"
Navigate to your script file and choose it. Once done click ok and it'll prompt you that something has changed and if you'd like to generate a new snapshot, make sure you do or it won't work.
That's it, you'll find once the publication has bulk copied over the the subscriptions successfully there are non clustered indexes on the tables. Pretty simple!

Transactional Replication Not replicating non-clustered Indexes

Hi
I have created a transactional replication.I am sure that I have configured it to replicate Non-Clustered indexes,
but It does not do so.
I tried several times to reinitialize the subscription,but still no luck.
Regards

It is True for sure.
But the problem is solved.I had to wait until the Initialize process get completed.
But I am sure that this problem happened before.Sometimes it works fine but sometimes not.
Hi ArashMasroor,
According to your description, it seems that you encounter the issue that non-clustered indexes property is reset to “False” sometimes.
To work around this issue, you can use a post-replication SQL script to create the indexes. Whatever articles you’re publishing open up the indexes drop down list of the article in object explorer, right-click on an index and levitate over Script Index as,
then Create-to, then click New Query Window editor.
Up will pop up a new query window with the resulting index. Work your way through all the indexes on all the articles of the publication, copy and pasting just the create index line and below of each script, pull them all together into one query window.
Once you’re done find a safe folder somewhere on your hard drive and save the SQL query as an .sql file with a sensible name. Then you can execute this script after applying the Snapshot. For more details, please review this
blog.
There is also a similar thread for your reference.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/b0f3870d-1a65-4384-a17b-96825ec5f098/transactional-replication-nonclustered-indexes-not-copying?forum=sqlreplication
Thanks,
Lydia Zhang
Lydia Zhang
TechNet Community Support

How to create a local, non-clustered storage pool

Hello,
I have setup a two-node Failover Cluster, with a shared SAS DAS. So far so good.
One of the nodes also has internal disks that I wish to use for system backups.
This storage pool should not be clustered, as the disks cannot be seen from the other node. The trouble is that as soon as I create the pool it gets added to the cluster (in failed state).
In fact, the "Storage Pools" window in the server manager will only show me the "clustered storage spaces", with my internal disks in the Primordial pool.
Get-StorageSubSystem will show me both subsystems (Clustered Storage Space on ... + Storage Spaces on node-1) but fails to create a storage pool on the "local" subsystem.
How can I create a local, non clustered storage pool on internal disks ?
Cheers
alex

Hi,
SpackTime_ is right, the DA storage usually for the localdata backup, but if you want to use for remote computer backup, you can share a floder then you can storage your backup, but also that backup won't work the shared computer crash.
The simlar thread:
Schedule Backup to Remote Shared Folder
http://social.technet.microsoft.com/Forums/windowsserver/en-US/726d3765-5f82-4590-b970-d45e17412281/schedule-backup-to-remote-shared-folder?forum=winserverfiles
Hope this helps.
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Remote JMS Queue in Non-Clustered Environment

          We have two hosts, both running WLS 8.1, that are not clustered. We would like
          to create a queue on the first and be able to read it from the second. Is this
          possible? How does one go about setting this up?


          Paul wrote:
          > We have two hosts, both running WLS 8.1, that are not clustered. We would like
          > to create a queue on the first and be able to read it from the second. Is this
          > possible? How does one go about setting this up?
          Hi Paul,
          This a common use case. Even user transactions
          can include operations from both servers.
          The remote server just looks a regular
          client as far as the JMS server is concerned.
          I recommend using MDBs - which can be be configured with a URL
          and connection factory, messaging bridges, and/or foreign destination
          wrappers. In addition, you can use the JMS resource reference
          pooling feature to pool the "foreign" JMS server's resources.
          For information you can start here:
          http://edocs.bea.com/wls/docs81/jms/intro.html#jms_features
          and here:
          http://dev2dev.bea.com/technologies/jms/index.jsp
          Important: As documented, for various reasons, some not
          having to do with JMS, you will need to ensure the following are
          true to enable "non-clustered" communication:
          - all domains should be named uniquely
          - all wl servers must be named uniquely
          - all jms servers must be named uniquely
          - all jms stores must be named uniquely
          Tom

Restore non-clustered to clustered

Looking for suggestions on the best way to proceed:
I have an RMAN image backup of a Windows/10g/32bit/non-ASM database which I would like to restore as a Windows/10g/64bit/ASM/Clustered instance. I only have the image available because the server it was on was rebuilt as 64bit and is currently set up as a 1 node cluster. We plan to add another node in the near future.
My current thinking is that I would have to restore the instance as non-clustered/file system, and then convert it to ASM/Clustered but I'm not quite sure if that is the best way or even how to do it at this point.
Any help or suggestions would be greatly appreciated.

Hi Srinivas,
IF this is a Windows x64 platform that we are talking about here, I just want to add the note that "Running 32-bit applications on a 64-bit operating system is generally referred to as "Compatibility-Mode" by many AMD64/EM64T hardware vendors. Irrespective of this terminology, 32-bit Oracle Database server is *not* certified on Windows x64. For the 32-bit Oracle database client, check the certification matrix for more details." - taken from http://www.oracle.com/technology/support/metalink/index.html > for RAC on Windows.
To me, this might have an impact on your statement: "64 bit OS Windows can serve 32 database. No problem there." - maybe not technically and for the purpose of the migration you might want to tolerate that.
Thanks.

OSM v7.2 - More that 1 instance in a non clustered environment

I am just wondering...
1) Can i install OSM separately on 2 servers while using the same database instance in a non-clustered manner?
This is for circumstances where I need a dedicated server resource for bulk provisioning for example.
2) If I am not using AIA in my implementation, how does COM calls a SOM cartridge and how does SOM reply COM on the completed status?
Is it via some default provided webservice, or do i need to find a way to implement it myself.
Thanks :)

Hi,
1. Though technically it is feasible to use two OSM instances with same database, it is not suggested as it may lead to locking issues and not sure how you are planning to acheive bulk provisioning by this way
2. The calling of SOM cartridge by COM and status updates of SOM to COM has to be implemented by yourself if you are not using AIA. You can make use of default webservices proivded by OSM
Regards,
JP

Weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Cannot export non clusterable object with jndiName ]

Hi,
I am trying to deploy an EJB module have 4-5 EJB's on weblogic 8.1 through JBuilder.
I am getting following error during deployment.
Exception:weblogic.management.ApplicationException: prepare failed for Sample.jar
     Module: Sample.jar     Error: Exception preparing module: EJBModule(Sample.jar,status=NEW)
Unable to deploy EJB: SampleBean from Sample.jar:
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Cannot export non
clusterable object with jndiName ]
     at weblogic.utils.Debug.assertion(Debug.java:57)
     at weblogic.rmi.extensions.server.ServerHelper.exportObject(ServerHelper.java:272)
     at weblogic.ejb20.internal.BaseEJBHome.setup(BaseEJBHome.java:95)
     at weblogic.ejb20.internal.StatelessEJBHome.setup(StatelessEJBHome.java:67)
     at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.prepare(ClientDrivenBeanInfoImpl.java:979)
     at weblogic.ejb20.deployer.EJBDeployer.setupBeanInfos(EJBDeployer.java:983)
     at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1283)
     at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:477)
     at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:2962)
     at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1534)
     at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1188)
     at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1031)
     at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer(SlaveDeployer.java:2602)
     at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(SlaveDeployer.java:2552)
     at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2474)
     at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:798)
     at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:507)
     at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:465)
     at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:25)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Any clue?, what its talking about?
Thanks
Naresh

Hi,
I am trying to deploy an EJB module have 4-5 EJB's on weblogic 8.1 through JBuilder.
I am getting following error during deployment.
Exception:weblogic.management.ApplicationException: prepare failed for Sample.jar
     Module: Sample.jar     Error: Exception preparing module: EJBModule(Sample.jar,status=NEW)
Unable to deploy EJB: SampleBean from Sample.jar:
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Cannot export non
clusterable object with jndiName ]
     at weblogic.utils.Debug.assertion(Debug.java:57)
     at weblogic.rmi.extensions.server.ServerHelper.exportObject(ServerHelper.java:272)
     at weblogic.ejb20.internal.BaseEJBHome.setup(BaseEJBHome.java:95)
     at weblogic.ejb20.internal.StatelessEJBHome.setup(StatelessEJBHome.java:67)
     at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.prepare(ClientDrivenBeanInfoImpl.java:979)
     at weblogic.ejb20.deployer.EJBDeployer.setupBeanInfos(EJBDeployer.java:983)
     at weblogic.ejb20.deployer.EJBDeployer.prepare(EJBDeployer.java:1283)
     at weblogic.ejb20.deployer.EJBModule.prepare(EJBModule.java:477)
     at weblogic.j2ee.J2EEApplicationContainer.prepareModule(J2EEApplicationContainer.java:2962)
     at weblogic.j2ee.J2EEApplicationContainer.prepareModules(J2EEApplicationContainer.java:1534)
     at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1188)
     at weblogic.j2ee.J2EEApplicationContainer.prepare(J2EEApplicationContainer.java:1031)
     at weblogic.management.deploy.slave.SlaveDeployer$ComponentActivateTask.prepareContainer(SlaveDeployer.java:2602)
     at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.createContainer(SlaveDeployer.java:2552)
     at weblogic.management.deploy.slave.SlaveDeployer$ActivateTask.prepare(SlaveDeployer.java:2474)
     at weblogic.management.deploy.slave.SlaveDeployer.processPrepareTask(SlaveDeployer.java:798)
     at weblogic.management.deploy.slave.SlaveDeployer.prepareDelta(SlaveDeployer.java:507)
     at weblogic.management.deploy.slave.SlaveDeployer.prepareUpdate(SlaveDeployer.java:465)
     at weblogic.drs.internal.SlaveCallbackHandler$1.execute(SlaveCallbackHandler.java:25)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Any clue?, what its talking about?
Thanks
Naresh

Error with running Singleton Service in a non-clustered mode

Hello,
I'm getting this error when try to deploy an app with defined Singleton Service in a WebLogic 10.3.5:
<Error> <Deployer> <localdomain> <AdminServer><[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default(self-tuning)'> <<WLS Kernel>> <><7785ef355ffde3d6:-4c7bfbbc:138dd48f82b:-8000-0000000000000002><1343742871514> <BEA-149231> <Unable to set the activation state to true for the application 'MyApp'.
weblogic.management.DeploymentException:
at weblogic.application.internal.flow.SingletonServicesFlow.activate(SingletonServicesFlow.java:67)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:636)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:205)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:184)
at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:361)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:52)
at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:200)
at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:31)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:170)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:124)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:181)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:97)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Caused By: java.lang.IllegalArgumentException: Cannot add Singleton Service MySingletonService as SingletonServicesManager not started. Check if MigrationBasis for cluster is configured.
at weblogic.cluster.singleton.SingletonServicesManager.addConfiguredService(SingletonServicesManager.java:280)
at weblogic.cluster.singleton.SingletonServicesManager.addConfiguredService(SingletonServicesManager.java:297)
at weblogic.application.internal.flow.SingletonServicesFlow.activate(SingletonServicesFlow.java:65)
at weblogic.application.internal.BaseDeployment$2.next(BaseDeployment.java:637)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:54)
at weblogic.application.internal.BaseDeployment.activate(BaseDeployment.java:205)
at weblogic.application.internal.EarDeployment.activate(EarDeployment.java:58)
at weblogic.application.internal.DeploymentStateChecker.activate(DeploymentStateChecker.java:161)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.activate(AppContainerInvoker.java:79)
at weblogic.deploy.internal.targetserver.BasicDeployment.activate(BasicDeployment.java:184)
at weblogic.deploy.internal.targetserver.BasicDeployment.activateFromServerLifecycle(BasicDeployment.java:361)
at weblogic.management.deploy.internal.DeploymentAdapter$1.doActivate(DeploymentAdapter.java:52)
at weblogic.management.deploy.internal.DeploymentAdapter.activate(DeploymentAdapter.java:200)
at weblogic.management.deploy.internal.AppTransition$2.transitionApp(AppTransition.java:31)
at weblogic.management.deploy.internal.ConfiguredDeployments.transitionApps(ConfiguredDeployments.java:240)
at weblogic.management.deploy.internal.ConfiguredDeployments.activate(ConfiguredDeployments.java:170)
at weblogic.management.deploy.internal.ConfiguredDeployments.deploy(ConfiguredDeployments.java:124)
at weblogic.management.deploy.internal.DeploymentServerService.resume(DeploymentServerService.java:181)
at weblogic.management.deploy.internal.DeploymentServerService.start(DeploymentServerService.java:97)
at weblogic.t3.srvr.SubsystemRequest.run(SubsystemRequest.java:64)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
It gets run only after deleting singleton-service entry from weblogic-application.xml:
<singleton-service>
<class-name>my.app.SingletonClass</class-name>
<name>MySingletonService</name>
</singleton-service>
Is it possible to run it in a non-clustered server without deleting Singleton entry from weblogic-application.xml?
Thanks

Did this help you ??
Not sure if it's related as here the issue is with clustered/non clustred and versioning!! the application which the bug talks about.

Running BizTalk on multiple non-clustered servers. Potential serious issue

Hi,
I have just discovered what has potential to be a fairly large issue in our current BizTalk Architecture. We are running BizTalk Server 2006 R2 on 2 different servers, running Windows Server 2003 R2. These servers are NOT clustered. Instead, BizTalk is installed
to both, configured on 1 and then on the 2nd, they have joined the existing BizTalk environment. We have 1 host with 2 host-instances for say an Orchestration Host. (So 1 Orchestration Host and then 1 Orchestration Host Instance on each server), we also have
a host instance for Receive and Send on each server.
This is a problem that I have identified on an application currently in UAT:
We have a routine called 'Recovery Mode'. It doesn't matter what Recovery Mode is but what does matter is that only a single instance can go into recovery mode at the same time.
Consider this:
bool inRecovery;
while (isBroken) {
if (!inRecovery){
inRecovery = true;
// Recover
inRecovery = false;
else {
// Wait, recheck until not in recovery, or fixed.
Imagine an instance on server 1 needs to go into recovery, it first checks the inRecovery flag, gets returned false so goes into recovery, let's say this takes 5 minutes to complete. During this time, an instance on server 2 needs to go into recovery, checks
the flag, but the flag on server 2 has not been set to true.... Now I have 2 instances in Recovery...
My questions are:
1. Can I cluster 2 non-clustered servers? I'd need to upgrade from Windows Server 2003 R2 Standard to Enterprise is that possible? If so, Can I simply upgrade and cluster the servers or would I need to format the disks?
2. If no to number 1, where would you store the 'inRecovery' flag'? I can't store in a DB as there will be slight cross over where instance 2 might return false in my example just as instance 1 is writing unless I can lock it on write or something.
Some advice would be greatly appreciated.
Thanks
Rod

To answer your specific question:
1. Yes, but you would need to upgrade to at least Enterprise. Windows Server 2003 R2 Standard does not support clustering. IIRC, the upgrade from Standard to Enterprise is pretty easy, perhaps just a SKU change.
2. If you absolutely cannot upgrade Windows Server, then you'd have to store the state externally, such as SQL Server. There shouldn't be any concurrency issues if you do the check in the right sequence. Basically, begin a transaction, attempt
to UPDATE, return weather the UPDATE was successful, meaning that call grabbed the lock. If you check then update, yes, there is a miniscule chance both will return the same value but only one near-sumultaneous UPDATE will succeed.

Load balancing, failover and fallback in Non-Clustered WebLogic environment

hi,
Has anyone implemented WebLogic 10.3.3 (or 10.3.4) in a Non-Clustered environment, but also got load balancing, failover and fallback work?
We were successful in getting failover working using t3://server1:7001,server2:7002 provider URL, but not load balancing or fallback.
The fallback is working when it was connecting to server2 and if we kill server2, then it switches to server1, but not when server2 is still running while server1 comes back.
All we need to find a way to enforce fallback to primary site, even if secondary which the client connected is still up and running and primary site comes back.
Any help appreciated.
Thanks.
Best regards,
Bala

hi,
Has anyone implemented WebLogic 10.3.3 (or 10.3.4) in a Non-Clustered environment, but also got load balancing, failover and fallback work?
We were successful in getting failover working using t3://server1:7001,server2:7002 provider URL, but not load balancing or fallback.
The fallback is working when it was connecting to server2 and if we kill server2, then it switches to server1, but not when server2 is still running while server1 comes back.
All we need to find a way to enforce fallback to primary site, even if secondary which the client connected is still up and running and primary site comes back.
Any help appreciated.
Thanks.
Best regards,
Bala

Apache HTTP proxying for load balancing only to a group of non-clustered WL servers

          Hi,
          We're running WL Server 6.1 SP 2 on Solaris 2.8.
          For the Apache HTTP proxy plugin, if you use the WebLogicCluster http.conf option,
          do the WL servers you want to load balance across have to be part of a WebLogic
          cluster (if you are prepared to do without failover, as I know it would need to be
          a proper WL cluster to replicate session info for failover). Can you load balance
          across a group of non-clustered WL servers, and maintain the user session to the
          one WL server so that it doesn't switch between servers on alternate requests for
          the same user session, or must the servers be configured as a WebLogic cluster?
          Paul
          We find that if you have a collection of WL servers that are not configured as a
          cluster, that it will load balance alternate requests to each server, but it will
          not pin a user to a single machine according to their session so for 2 servers, 2
          differetn sessions get created, one on each machine.
          Is this because it doesn't normally do this, but sends the user alternately to a
          primary then secondary which works in a cluster because the session is replicated.
          I thought the secondary was only used when the primary failed.


We're running WL Server 6.1 SP 2 on Solaris 2.8.          >
          > For the Apache HTTP proxy plugin, if you use the WebLogicCluster http.conf
          option,
          > do the WL servers you want to load balance across have to be part of a
          WebLogic
          > cluster (if you are prepared to do without failover, as I know it would
          need to be
          > a proper WL cluster to replicate session info for failover). Can you load
          balance
          > across a group of non-clustered WL servers, and maintain the user session
          to the
          > one WL server so that it doesn't switch between servers on alternate
          requests for
          > the same user session, or must the servers be configured as a WebLogic
          cluster?
          You don't have to use the clustering option. To get failover, you'll have to
          use the JDBC persistence option of WL.
          > We find that if you have a collection of WL servers that are not
          configured as a
          > cluster, that it will load balance alternate requests to each server, but
          it will
          > not pin a user to a single machine according to their session so for 2
          servers, 2
          > differetn sessions get created, one on each machine.
          >
          > Is this because it doesn't normally do this, but sends the user
          alternately to a
          > primary then secondary which works in a cluster because the session is
          replicated.
          > I thought the secondary was only used when the primary failed.
          The primary/secondary stuff requires clustering. If Apache continues to
          "load balance" after the first request, you need to either use JDBC session
          persistence or use a different load balancer (like mod_jk for Apache or a
          h/w load balancer with support for sticky).
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com/coherence.jsp
          Tangosol Coherence: Clustered Replicated Cache for Weblogic
          "Paul Hammond" <[email protected]> wrote in message
          news:[email protected]...
          >

Space occupied by clustered index Vs non-clustered index

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