10gAS clustering benefits

Can some one give me list of benefits for clustering 10gAS(10.1.3.4) SOA Suite?
Thank you.
-Megha

pros
-high availability and manageability, ie. one server can go faulty and you will still be able to access the apps. With regards to manageability patching can be done one by one.
-scalability with the usage of distributed resources
cons
- for any application deployed to a cluster which stores content locally on the server a different solution needs to be sought like XML database or a NFS filesystem.
regards,
Bernhard Jongejan
[bernhardjongejan.spaces.live.com]

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Help on Clustering of tables

Hi,
The below is an example of 3 tables for which i want to cluster.
I have the following structure of the 3 tables:
Table A Primary key -> referenced by Table B
Table A & B Primary key -> referenced by Table C
I have done the following:
1. This is the cluster created for the table A primary key ano
create cluster a_cl
ano number(10)
2. This creates a table A with the cluster command
create table a
ano number(10) primary key,
aname varchar2(20)
cluster a_cl(ano);
3. This creates another cluster for the table B as it is referenced by table C ( I have no idea if this has to be done)
create cluster b_cl
bno number(10)
4. This is the command i used to create a table which is having 2 clusters in it - cluster of table A & table B
create table b
(bno number(10) primary key,
bname varchar2(20),
ano number(10),
foreign key(ano) references a(ano))
cluster a_cl(ano), -- of table A
cluster b_cl(bno); -- of table B
The above command gave me the following error:
ORA-01769: duplicate CLUSTER option specifications.
I could not proceed further for the clustering of table C due to the above error.
How do I use cluster command for a table which is related with 2 or more tables?
I have gone through many examples on clustering but almost all of them have only one example in which only one table is related.
Can anybody help me in this regard?
Thanks in advance for any help.
Regards,
Rajashree.

Rajashree,
I understood relationships between them. It's just strange bacause many-to-many relationship includes many-to-one. If you have a reason, that's fine.
Before creating a cluster try to find out why you need it. Don't create because you heard that clusters can improve performance dramatically. They may, but they are usefull only in certain cases whereas in others they may cause in very poor performance. To find useful information about clusters see Oracle Documnetation: Oracle8 Concepts.
Read my first answer carefully. There is one of possible cluster organizations. How you want to organize your cluster depends on what you want. If you don't understand how cluster may benefit you, don't do it. I recommend to read carefully Oracle Docs to find out clusters benefits.
Aleksandr

Howto deploy applications to clustered 10gAS

Hi All,
I have a 10g Application Server which is clustered on 2 nodes. I need to deploy a ear file in this environment. Can someone guide me on how do we do the deployment on a clustered environment.
I have been doing this in a standalone environment using the 3 step wizard thats available in EM, but i dont have any clues on how to do in a clustered environment.
Kindly let me know on how can we deploy applications to 10gAS R3 server on a clustered environment or point me to some links where i can get more info.
Thanks,
Amby.

Hopefully this will help:
http://download.oracle.com/docs/cd/B32110_01/web.1013/b28951/ascontrol.htm#CIHJDECA
Thanks
Shail

Clustering of Oracle 10gAS (Forms and Reports Standalone edition)

Hi,
Does anyone have experience of clustering of Forms\Reports in 10g environement with Forms and Reports Standalone edition?
Clustering at Application Server level?
Clustering at hardware level (load balancing \SAN for code storage)?
Clustering at OS level (MS Clustering)?
I am interested to know about others experiences\thoughts.
John

Since 10g Version (904) you can only cluster the infra (Cold Failover Cluster and Active Failover Cluster), the HA for Forms and Reports is only by frontending with a Loadbalancer, and I'll sugesst not to use WebCache as this frontend because forms get a lot of problems.
Regards.

Customer would like to have details on Clustering resources usage

IHAC that currently implemented an application using 6 WLS instances in 6 domains (!) and 2 phisical servers. I mean they have 6 admin with a single managed server each. They did so to implement an High Available system, working Cluster-like.
When I told them that a better configuration should be 1 Admin and 6 managed servers using the standard Clustering WLS features they claimed that it will be resources consuming, more than the current configuration.
Is there any document where we describe the best way to implement Clustering and a benchmerk where we show the differences in system usage when using cluster and not using it, and also the Pro/Cons of having a clustered architecture?
I cannot find a the info in the standard WLS docs.
They have a WLS 9.2.
Thank you !
Chiara
(ACS Service Manager)

The following doc tells more about why one should cluster.
http://download-llnw.oracle.com/docs/cd/E13222_01/wls/docs92/cluster/overview.html#wp1011562
Scalability
High-Availability
Application Failover
Load Balancing
If your customer doesn't need the benefits mentioned in the above doc then, there's no need for them to cluster their app.
I agree with your customer that cluster adds resource overhead. Most customers in production environment choose high availability and load balancing against additional resource consumption at runtime.
Following the performance tuning best practices and understanding customers application, one can decrease the overhead of clustering to some extent.

How to create clustered index in Oracle ?

I need to Create unique clustered index idx_col1 on table1(col1) in Oracle 9i.
Should I declare it at creation of table as index-organized ? My table is created with the code like Create table table1 as select ..... from ....
Can anybody post an example ?
Thanks

Oracle does not have the concept of a clustered index from SQL Server. You may get something similar if you create your table as an index organized table, i.e.
CREATE TABLE my_iot (
col1 number primary key,
col2 number
organization index;or you may get similar benefits by creating a cluster. It really depends on what functionality you're trying to replicate and what problem your trying to solve. Either way, though, you'll have to have separate steps to create the table and then to insert the data.
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Benefits of SCAN

I want to find all benefits of using SCAN listeners over using VIP's without SCAN. The following is my summary, along with some comments. I'd like to hear your comments, and please add anything I missed. Thanks.
* Less typing in a TNS entry.
* If you add or remove a node, or make a node unavailable or available, you don't need to modify all your clients' TNS entry. But many shops centrally manage TNS (by periodically distributing a standard tnsnames.ora to all clients, placing the file on a shared drive, using OID or Oracle Names server, etc). This benefit is minimized.
* Because SCAN is tied to 3 IPs, DNS provides round-robin on the client side. If you use VIP's without SCAN, you have to remember to add load_balance=yes to the TNS stanza to have the same effect.
* Some clients have trouble accepting more than one database host entry in their configuration. SCAN is a life saver.
* If you use policy-managed databases, SCAN is mandatory.
* Installation of RAC requires SCAN. But you can choose to not use it later, or even disable it.
Disadvantage or caution in using SCAN is not in this list.

Your list is good but here is a couple of thoughts:
If client is using version older than 11.2 then you still need to add several IPs in TNS entry (even server is SCAN capable) .
This is because the SCAN was introduced in version 11.2.
There is also new features for SCAN in Oracle 12c:
- SCAN and Oracle Clusterware managed VIPs now support IPv6 based IP addresses.
- SCAN is by default restricted to only accept service registration from nodes in the cluster.
- SCAN supports multiple subnets in the cluster (one SCAN per subnet).
Here you can find good document about SCAN:
http://www.oracle.com/technetwork/products/clustering/overview/scan-129069.pdf

HR Benefits Best Practice

Is there an HR Benefits Best Practice document floating around out there?

Old question, but I have the same problem at this moment.
We also are looking into 2 solutions:
1. use the substitution costcenters
2. Create a custom function in our payroll scheme and modify the costcenter during payroll-run. Normally the costcenter will eb saved in the clusters and will be read from the clusters in the fico-run.
Anybody some good advice for this?

Benefits of RAC in large systems environment

Hi All,
One query regarding RAC
In a large systems environment where multiple CPUs and memory are dynamically available to be deployed for a database server, what are the benefits of a RAC implementation? Obviously no single point of failure is eliminated but how else is performance improved?
Thanks
Edited by: user10394804 on Aug 10, 2009 1:17 AM

A clustered system either DB or the system(OS) or any other form of clustering is designed for high availabilty only and not for performance improvement.
Please keep in mind that you need to check the performance of 2 clusterd and non-clusterd systems with the same level hardware and OS resources.
If your application is performing at level 'X' with 4 CPU and 4 GB RAM on a non-clusterd machine then its performance cannot be matched with the 2 machines with 4 CPU each and 4 GB RAM each, because thats the double the resources than available in non-clusterd machince.
Also just keep one more thing in mind that with the same resources now distributed in clustered nodes (ie 2 nodes with 2 CPU and 2 GB RAM v/s 1 node with 4 CPU and 4 GB ram), the single node will alawys perform better because there will be no inter-connect overhead that is there in RAC systems.
Amar.

Benefits to vPC on 6200s (Fabric interconnects) in UCS

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Are there similar benefits with the UCS 6Ks to the 7Ks or with the ensuing VMware cfg? Like maybe simplifying the pinning to the uplinks.
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Ken J

Ken,
The 6200's are not clustered switches as you might find with a pair of N5Ks/N7Ks. Best practice for UCS uplinks in thei regard would be to create port channels on from each 6200 side, going up to separate N5K/N7Ks as VPCs. This gives full mesh redundancy from each fabric.
From a VMware perspective, you would not do any specialized channeling at the vSwitch/vDS level. You woud use the default vSwitch teaming method - which is Source-Base-On-Virtual-Port-ID. This allows multlple uplinks connected to the same vSwitch wtihin VMware, without having to aggregate any of the links. This would completely complement the UCS configuration.
Hope this makes sense, if not let me know.
These two deployement guide would be a good read for you:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Borderless_Networks/Smart_Business_Architecture/February2012/SBA_Mid_DC_UnifiedComputingSystemDeploymentGuide-February2012.pdf
http://www.cisco.com/en/US/solutions/ns340/ns414/ns742/ns743/ns748/landing_dcServer-blade.html
Regards,
Robert

Benefits of caching

Hi,
I am trying to analyze the benefits of using a third party O to R
mapping tool which also provides server side caching. If most of my
application(say 75%) is doing batch inserts/updates and doing batch
reads(or otherwise paged reads using a Page by Page Iterator) does
caching really provide benefits in this scenario ? Right now pure JDBC
seems really fast. If we are doing a lot of single row reads does it
hurt to go to the database every single time ?
Thanks,
Aswin.

If we are doing a lot of single row reads does it
hurt to go to the database every single time ?Yes. The more writes you do compare to reads, and the more data you are
operating on (reads and writes) the worse the cache performs per amount of
memory used by the cache.
Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"Aswin Dinakar" <[email protected]> wrote in message
news:[email protected]..
>

Weblogic 6.1 Sample Clustering example

          Hi all,
          I want to run the sample cluster example
          in Weblogic v6.1 But I couldn't find the
          proper config required for setting up the server.
          I'll be very glad if someone
          could tell me how to configure WL Servers on 2 different
          m/c's to run the demo example in Weblogic v6.1
          Pls note that I've gone thru the latest docs of WLS 6.1
          But still couldn't get it. I'll be very glad if anyone can
          tell me the detailed procedure of it.
          Regards,
          Prashant


Does Weblogic 6.1 (SP2) clustering work better on Sun Solaris than Windows          2000?
          Yes.
          ... but that's a misleading answer because Weblogic in general works better
          on Sparc/Solaris than on x86/Windows. The clustering implementation is Java,
          so the same code runs on both Windows and Solaris, and works well on each.
          The benefits that Solaris provides are seen primarily in terms of ability to
          handle load more gracefully and in its overall stability -- once you get it
          configured correctly anyway.
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          Clustering Weblogic? You're either using Coherence, or you should be!
          Download a Tangosol Coherence eval today at http://www.tangosol.com/
          "Sam" <[email protected]> wrote in message
          news:3c508b7e$[email protected]..

Benefit of clusters

Hi
Just want to understand why do we need to have clusters in WebLogic environments.If we have say 4 managed servers, the load balancer can balance all 4 of them without knowing about the cluster.I have read various benefits at
http://download.oracle.com/docs/cd/E11035_01/wls100/cluster/overview.html#wp1011562
need to know how it is practically beneficial please
thanks

Hi,
If you are integrating weblogic cluster in apache using weblogic plugin , then apache acts as load balancer and distributes the requests to weblogic cluster.
If you do not want to create a cluster in weblogic and still you want to loadbalance the requests among your weblogic managed servers, you can use mod_proxy_balancer.so module which is newly introduced from apache 2.2.x onwards.
This module will load balance the requests to weblogic managed servers, even it will maintain the sticky sessions alos.
For detailed configuration please refer the below link :
http://middlewareforum.com/weblogic/?p=285
Thanks,
Kartheek

Clustered Application Deployment

Can anyone tell me please with Weblogic Server 10.1 we have a cluster with two managed servers and currently deploy an application to the cluster which works very well. Is there a way to deploy an application to one managed server at a time so that at some point one managed server may be running an older version?
Thanks

Hi Steve
I might not be understanding completely what you're proposing here, but this is my $0.02:
Unless the name of the deployment you create within WebLogic Server has the version of the application included, you're going to have problems deploying two different versions of the same application to two different servers in a clustered environment.
It's technically possible, but it's going to be a headache. For example, how would you route traffic reliably to one version of the application or the other?
The other big issue is that, by deploying to individual managed servers, you're not really taking advantage of the fact that you're in a clustered environment. If you've got a different codebase on each server instance, then you absolutely don't want objects replicated across the cluster.
Have you looked at side-by-side deployment? (http://download.oracle.com/otn_hosted_doc/wls/redeployment/wls-side-by-side-non-annotation_viewlet_swf.html)
That would give you a smooth transition between two versions of the product, that would be managed by WebLogic Server and allow you to still have all the benefits of a clustered environment...

Clustering - is it worth it?

About one week a month we kill our HFM server, close week. We currently have a single instance of HFM on one server. Have another server that isn't doing much and was reading up on HFM clustering. Tried it when it was HFM 3 but haven't revisited it since...
Soo... HFM 9.2.0.3 - is clustering worth the effort of setting up?

Hi,
What I mean is, that I guess you must have a core of HFM Application Administrators, power users if you like, who do the biggest consolidations. Well you can set up your second HFM application server so that only these power users know about it. So normal users will do what they have always done, but the power users will run their big consolidations on this second server, that way their big consolidations will not hamper the users too much.
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10gAS clustering benefits

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