Monitoring oc4j load balancing

Hi
We are using mod_oc4j to load balance our OC4J_BI_Forms application between 3 application servers. Is it possible to monitor those servers ? Can i add or remove servers "on the fly" without restarting the servers?
We use 9iAS rel 2 with Windows 2000
Regards,
Louis

Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
Thanks again,
Tony
For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
To implement the solution, please execute the following steps:
1. Deploy application into different containers with the same application name.
2. Modify the mod_oc4j.conf as follows:
Oc4jMout /test <oc4j instance 1>, <oc4j instance 1>,...

Similar Messages

Session replication in oc4j load balancing not working ..

Hi All,
I have windows 2000 machine. I have installed 2 instances of oc4j running on ports 8888 and 8889. I started the loadbalancer.jar in the first instance, started the first oc4j instance and then started the second oc4j instance. I have a common application deployed on both instance1 and instance2 and that is nothing but out famous SessionServlet.
If I access this servlet using http://localhost:80/app/servlet/SessionServlet then I am getting a count as 1 . My loadbalancer that is started from first oc4j instance(running on port 8888) is showing that the request is routed to the first instance. I stopped my first instance1 and then again from the same browser/session/client if I access the same servlet using http://localhost:80/app/servlet/SessionServlet then still I am seeing the count as 1 instead of 2 . At this point my loadbalancer is showing that the request is routed to the second oc4j instance(running on port 8889) since first instance is stopped. So why am I seeing the count as 1 instead as 2.
Also,
1. Is it enough that we start the loadbalancer.jar in the first oc4j instance. What about the loadbalancer.jar in the second oc4j instance ?
2. We all know that Apache HTTP Server runs on port 80. But since I didnt[i]Long postings are being truncated to ~1 kB at this time.

thank you debu, I have one doubt . In the clustering/load-balancing documentation at metalink(doc id: 151717.1) it is said that in point 4b that we should add the tag <cluster-config /> to orion-web.xml file but this file will be created only after the web application is deployed and it is accessed atlest for one time. So is it that we should first deploy the web application and then access it for atlest one time then stop the server and add this tag .. or is there any other way workaround ?

OC4J load balancing

We got multiple JVMs configured and running. Since we are not able to share the session among the JVMs we are having issue running the application on mutiple JVM since the OC4J is doing the load balancing. For example, if request is established on one JVM the next request is sent to another thus the application fails by not finding the session object. Is there a way we can have the sticky on OC4J so that if the session is established on one JVM then continue to use that JVM through out the life cycle of the session. Another word load balance only if the request is new. Thanks in advance for your help.

Okay, how about if you have multiple web application that are sharing the session.
Is there a way we could say these web application should be running on the same JVM? If you mean by this that you have different WAR files (either standalone or contained in an EAR file) that need to share common session state, then we don't support this with OC4J. A session is bounded within the Web module that it is created within. I think someone on here had come up with a way to do once before it using a different cookie name and a common cookie path but its not something we do by default.
Do you know how to configure them to run on the same JVM. Would parent work?
Could we make one web app parent for others - if so would it guarantee to run the the same JVM?The parent config doesn't dictate any runtime behaviour -- it's configuration, classloading based parenting only.
We have a scenario where our web applications are dependent upon each other - meaning they need to run on the same JVM together since they are sharing the session. It sounds to me that if you have this sort of requirement, then it'd be worth your while looking at our Coherence*Web functionality. This provides a way to allow the Coherence distributed cache to be used as the session/session-replication infrastructure -- effectively switching out the native session manager from OC4J (and other J2EE servers, Tomcat, etc.).
It has a switch that enables cross Web module state sharing. Because it's a distributed cache too, it will allow all JVMs to see/use the same view of the current session state.
See here for more details:
http://coherence.oracle.com/display/COH34UG/Coherence*Web+Session+Management+Module
http://coherence.oracle.com/display/COH34UG/Coherence*Web+Session+and+Session+Attribute+Scoping
-steve-

Oc4j load balancing AS 101202

Can anyone point me to some good documentation for configuring load balancing for oc4j instances?
I've seen a lot on metalink, but all dated back to 2002. I was hoping there was some new documentation for 10gR2.
I'm trying to load balance 3 webservice OC4J instances which each point to different API servers as the API servers themselves are single threaded.
Thanks for the assistance,
Tony

Thanks for the post. We had a little difficulty getting enough specifics out of the documentation to answer all our questions. But opened a TAR and got a good engineer who worked with us to get a custom load balancing solution that is working very well for us.
Thanks again,
Tony
For others out there that are interested, we ended up with a very simple load balancing setup that simply requires that the mod_oc4j.conf be modified to group the containers.
From Oracle:
To implement the solution, please execute the following steps:
1. Deploy application into different containers with the same application name.
2. Modify the mod_oc4j.conf as follows:
Oc4jMout /test <oc4j instance 1>, <oc4j instance 1>,...

A question about oc4j load balancing/ failover behaviour

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
- I set up two oc4j instances (say oc4j1 and oc4j2) pointing to a load balancer entering the following in <J2EE_HOME>config\http-web-site.xml:
<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
and
<frontend host="<host>" port="80" />
- I entered <cluster-config/> and <session-tracking/> in each oc4j instance's orion-web.xml, and <distributable/> in their web.xml files.
- I started the loadbalancer(java -jar loadbalancer.jar -debug) and the oc4j instances.
Everything works fine up to a point. They are both added to the cluster and the debug messages show that requests are being routed to oc4j1 and cluster session value update messages are sent by oc4j1 and received by oc4j2. When I shut down oc4j1 requests are routed to oc4j2 and session information is maintained.
However, when I start up oc4j1 again, it does not appear to be receiving the session value updates now being sent by oc4j2 so if I now shut down oc4j2 the session is lost. Can anyone please tell me what I have missed?
Thanks in advance
- Al

Hi
I have been trying to set up load balancing using 9.0.2 standalone oc4j instances that share sessions.
- I set up two oc4j instances (say oc4j1 and oc4j2) pointing to a load balancer entering the following in <J2EE_HOME>config\http-web-site.xml:
<web-site host="<ip>" port="<port>" display-name="Oracle 9iAS Java HTTP WebSite" cluster-island="1" >
and
<frontend host="<host>" port="80" />
- I entered <cluster-config/> and <session-tracking/> in each oc4j instance's orion-web.xml, and <distributable/> in their web.xml files.
- I started the loadbalancer(java -jar loadbalancer.jar -debug) and the oc4j instances.
Everything works fine up to a point. They are both added to the cluster and the debug messages show that requests are being routed to oc4j1 and cluster session value update messages are sent by oc4j1 and received by oc4j2. When I shut down oc4j1 requests are routed to oc4j2 and session information is maintained.
However, when I start up oc4j1 again, it does not appear to be receiving the session value updates now being sent by oc4j2 so if I now shut down oc4j2 the session is lost. Can anyone please tell me what I have missed?
Thanks in advance
- Al

OC4J Load Balancing on 10G R2

Greetings!
I am trying to set up OC4J with multiple JVMs on 10G R2 and did this by setting the Number of Processes parameter to 2 under Server Properties. We need sticky sessions in our app - my small tests so far seems to indicate this is working without me having to do anything.
The reason for doing multiple processes is that our app consumes a lot of memory and with the restriction on the max JVM heap size, we are trying to exploit the full capacity of high-end servers.
Here are my questions:
1. Is this really as easy as it seems ? :-) Am I missing something - settings etc.? I went through documentation below and it does not have anything specific on how to choose number of processes except saying it is "specific to a computer."
[http://download-west.oracle.com/docs/cd/B14099_11/core.1012/b14003/midtiermanage.htm]
2. Is session replication disabled by default? There is a link on the OC4J administration page for replication which is empty. This works for us as not all objects we put in session are serializable.
3. We have a configuration file that is read by a singleton. For multiple processes we want different values to be read by the singletons running on different processes. Is there a pattern for doing this? I am thinking of creating a lock file/index file to indicate if another process has already read the configuration. Anything better?
I am new to this. Will appreciate all comments/suggestions.
Regards,
Arnab.

Hello Arnab,
It looks like the Metalink Note 175593.1
"Configuring Multiple OC4J Instances as a High Availability Cluster"
would be of a good help to answer your questions.
Sincerely,
Steff

Monitoring Load balancing in Tuxedo 9.1 and RAC ?

Hi all,
I wrote this question in the old forum bea [http://forums.bea.com/thread.jspa?threadID=300006084], and now I have more question about monitoring of load balancing in tuxedo with RAC:
How can I monitor the load balancing in Tuxedo with RAC?
How can I check that the load balancing of tuxedo is running correctly?
How can I know that group are using my requests?
We need know if the request use the instance ORARAC1 (groups GRP_A1 and GRP_A2) or
use the instace ORARAC2 (groups GRP_B1 and GRP_B2).
There is some tool (similar txrpt) that displays this information in tuxedo 9.1?
Thanks in advance
P.D.: Excuse my english

Logistics Management vs Supply Chain Management
Chapter 1 Logistics
1.1 Logistics Management vs Supply Chain Management
First of all, we must clarify this big semantic matter: what is logistics? what is Supply Chain ? are these two names equivalent?
We can represent this question by this figure
Is SC part of the logistics? or is it the reverse? or is logistics replaced by SC? or are both the same? or are logistics and SC covering partly the same matter but both continue to exist ?
To answer to that question, we have to consider the definition of each concept. We use the definitions commonly accepted by the CSCMP (Council of Supply Chain Management Professionals). These definitions also are used by the APICS (The Association for Operations Management: the global leader and premier source of the body of knowledge in operations management, including production, inventory, supply chain, materials management, purchasing, and logistics.)
The logistics management is that part of the Supply Chain process, which plans, implements and controls the efficient, effective flow and storage of goods, services and related information from the point of origin to the point of consumption in order to meet customers’ requirements.
The supply chain management is the integration of key business processes, from the end user through original suppliers that provides products, services and information that add value for customers and other stakeholders.
Thus the answer to our first question is clearly
In a Supply Chain, each enterprise is a partner; each partner is fully responsible for a process that transforms inputs into outputs using some resources and following the rules or norms.
The concept of supply chain suggests a series of processes linked together (they form a chain !).
Figure 3
Somebody is the producer of the raw material, somebody transforms it into a product, somebody incorporates the product into an assembly, somebody stores the finish good, somebody sells it, somebody transports it and finally a retailer sells it to a final customer who is the consumer.
Some of these processes are sourcing, others are manufacturing and others are distribution.
If we illustrate the system for a more complex product, we obtain the hereunder schematic.
The pilot of the Supply Chain must instruct each supplier about when and to whom they have to deliver their products. He must instruct supplier "A" to first supply "B" and later the main manufacturer; for another part, he must instruct "B" to first supply the main manufacturer and later the supplier "C", if it is the right way to get the product on time as promised to the customer.
Figure 4
1.2 Flows
As indicated here above, all the partners are linked (they form a chain). These links cover 3 flows:
1. physical product flow (material flow)
The materials flow from suppliers to customers and from customers to suppliers (reverse flow).
The products are packaged (primary package, secondary package, warehousing package, transport package). Each package fills a specific function. (to see chapter 6). Containers, pallets and some packaging are circulating round trip.
The management of the materials flow must deliver products on time, in the proper sequence, exactly where they are needed.
2. information flow
Information is flowing in both directions, is passing each other, is colliding with others …
The information include order, delivery, inventory level, production status, forecasts, quotation …
The information could be considered as the piloting system of the other flows.
The information is flowing between multiple organizations and enterprises, each one having its own managing system, its own value system ….
3. financial flow
They include credit terms, payment schedules, title ownership arrangements …
A major problem concerns the coordination, the synchronization between all these flows. The final objective of the logistics / supply chain is to reduce costs and to improve service levels at the profit of all the partners of the chain, suppliers, manufacturer and customer. Each activity playing a role in making the product and the services conform to customer requirements (cost, delivery terms, quality …) is concerned.
In the past, each enterprise was trying to strangle other enterprises to obtain the major advantage (and to avoid realizing some effort). The bigger was crashing the smaller.
Today, no single enterprise is solely responsible for the competitiveness of its products and services. The benefit obtained by working in network must be shared between all the members of the chain. The sole strategy that performs is the win-win strategy.
The competitiveness suppose to give a better service, a superior service to the final user of the product / service (decreased delivery times, repairing/exchanging defective parts, maintenance, warranties, price, reliability, performance).
Today, we have to consider the total system wide cost; it includes manufacturing, transportation, packaging, warehousing, distribution, rework, repair, administrative costs. Managing the supply chain is not minimizing a single cost between two entities but, rather, on taking a global system approach to get, at the end, the better result that profits to every chain partner.
If one looks at actions in isolation, it is not possible to have a global view and to identify how an isolated action could have a reverse effect. Each decision taken by a partner of the chain has an effect on the upstream and downstream partners. And this effect could be positive or negative. For example, a supplier will reduce its inventory that leads to increase the delivery terms of the downstream partners; for example, a transportation manager will delay a delivery to increase the volume to transport and to reduce the transportation cost.
1.3 Management
It is obvious that designing and operating a supply chain so that total system wide costs are minimized and system wide service levels are improved is very challenging. It is not easy to do that inside a single enterprise, how more if one must consider several enterprises. We could write that the complexity increase exponentially with the number of partners.
with C = complexity of management, k a function depending of the product and n = number of partners.
The criteria to be considered are:
q the complexity of the network mainly if the partners are located over a large geographical area
q the cultural clash between partners
q the difference of capacities of partners: some are SME, others large enterprises, some are assembler, others are machining and some are giving service … Each partner has its own limits, its own capacities and its own resources. It is not thinkable to build a supply chain only with partners having the same constraints.
q the planning process could be different depending of many factors external to the supply chain. It is normal that an enterprise could be partner of several supply chains (example: the ball bearings supplier belongs to several automotive manufacturers supply chains).
q the supply chain is a dynamic system that evolves over time. Everything can change quickly or frequently either on the customers’ side, either on the suppliers’ side, either the market conditions, either the environmental conditions.
1.4 Three levels of management
As every activity, we have to consider the three levels: strategic, tactical and operational.
a) Strategic level.
The strategic level deals with decisions that have a long-lasting effect on the enterprise.
Every department or service has to fit with the strategy of the enterprise.
q The Supply Chain strategy must deal with the procurement of raw materials and all the components used by the enterprise.
Procurement includes packaging, transportation, documentation, warehousing.
q The Supply Chain strategy must deal with the logistics operations inside the manufacturing plant
This includes the flows through the plant, the interoperations packaging, the information, the traceability …
q The Supply Chain strategy must deal with the distribution and usage of the product by the customer.
This includes the selection of the distribution channels and the operations to supply the retailers, the instructions of use and all the operations covered by the warranty and the after sales service.
The long-lasting effect must be considered by product. If the life cycle of the product lasts several years, the strategic level covers more than 2 years; if the life cycle of the product lasts less than one year (i.e. tamagushi ….), the strategic level is not a fundamental step. But reasonably, the strategic level for the majority of the products covers 2 or 3 years.
Some of the basic questions are: 1) make or buy question;
2) location and capacities of production facilities, warehousing, transportation;
3) technologies to be mastered;
4) machines and equipments to be used, rented or …;
5) layout of the production facilities and warehouses;
6) quantities of products to be purchased, launched in production, stored, packed together, transported;
7) the relevant information for the manufacturing;
8) the training of the operators;
It is obvious that all this has a cost and therefore has to be amortized on several years.
b) Tactical level.
The tactical level concerns generally a period of time of one year. It is prepared during the last quarter of the previous year.
The tactical level has to focus on the expected situation at the end of the previous year to establish a series of significant data as 1) quantities to be distributed on each market;
2) exact quantities of raw materials and components to be purchased and when to place orders 3) the planning of manufacturing by quantities, by specifications, …
4) the distribution activities by month, mainly if the products demand is seasonal;
5) to prepare the impact of the promotions on the distribution;
6) to optimize all the logistics functions;
7) to fix the key indicators to allow a performing management;
8) to establish the calendar of each specific step to reach the annual objective;
9) to match demand and supply
The tactical level is the annual budget.
c) Operational level.
The operational level is the real time management. Some activities are planed on one week, others on a day and the updates are permanent. The operational level has to face the failure of a truck, the illness of a warehouseman or a driver, a urgent non planed order, and so on.
The quality of an organization can be measured by the respect of a well constructed plan and by the reactivity face at unforeseen situations. No waste of time, no waste of resource must be the rule for the operational manager.
He must be able: 1) to meet the better lead-times,
2) to respond to any fluctuation of the demand,
3) to deal with all the products (from fast moving goods to industrial component),
4) to face any unexpected situation.
To do that, he must pilot several logistical drivers as forecasting, transportation means, warehousing facilities, inventory, orders management, sourcing possibilities … and these drivers are fed by information. All these drivers can add value or cost at the customer’s eyes.
q Forecasting allows to feed all the other drivers
q Adapted transportation means allow fast loading and unloading and reduced operational costs by comparison with the value of the transported goods
q Warehousing facilities are located at the best operational place to supply their customers (outbound) and to receive goods from suppliers (inbound); they have well adapted infrastructures to store goods. The objective is to get the better responsiveness, to get the better control on each local market, to get the cheapest cost.
q Inventory must be adapted to the demand: enough to face unexpected demand and not too many what carries overstock and therefore additional costs and ageing products.
q Orders management reduces lead time and allows a full control on all the documents issued from these orders as picking ticket, packing list, invoice, …
q Sourcing possibilities allows a better control on the products arrival, access to the docks without waiting times, better management of the purchase orders …
We can summarize all these concepts by 3 curves as follow and the total logistics cost is the sum of these three costs:
Figure 5
We can represent these situations by the following outline representing three concrete situations:
Figure 6 a Figure 6b Figure 6c
Figure 6a represents 4 suppliers delivering to 1 central warehouse and from this warehouse to the customers;
Figure 6b represents 4 suppliers delivering to 2 central warehouses and each warehouse delivers to its customers;
Figure 6c represents 4 suppliers delivering to several warehouses and each one delivers to its own customers.
It is necessary to determine the number of warehouses, their locations, their sizes, the quantity of products to be stored and the location and number of customers to be supplied to get the best service at the lowest cost. The enterprise must compare the costs of opening more warehouses and the benefits to be closer to the customers.
For another part, it is important to take into account the specificity of the warehouses: only to supply a manufacturing facility, only to supply end customers or supplying both manufacturing facility and end customers. The basic functions are the same but they are several important differences:
q to supply a manufacturing facility means many suppliers (for raw materials and purchased components) and a few customers (manufacturing sections).
q to supply end customers means very few suppliers ( final assembly line) and a large number of customers (all the customers for finished products and spare parts)
q other differences concern the quantities, the size, the physical configurations, the variability and predictability of the demand, the unforeseen breakdowns (machines, trucks and trailers …), the capacity of each buffer between each manufacturing or supply process, lead-times acceptable by each downstream customer, size of batches, safety inventory size, risk parameters …
1.5 Supply Chain Information
As here above mentioned, information feeds all the logistics drivers. Therefore, it is important to detail the content of these information. The supply Chain Management manipulates a lot of information that each one affects strongly or weakly the results. Firstly, we have to consider the information that affect directly all the logistics drivers.
Forecast is affected by the economic situation of the market, by the financial situation, by the wealth of the population, by the obstacles to the trade, by the adequacy between the specifications of the product and the needs of the customers … All the data concerning these parameters must be considered as useful information.
Inventory is needed to face the responsiveness to the demand of the market. The Supply Chain Manager must know this requirement to establish correctly the level of inventory for each item as well as the inventory cost.
Transportation information include frequency of each transport vector, capacity of each one, availability, possibility to circulate, cost, particular requirements as national flag or piracy risk ….
Warehousing size and location have important consequences on several managerial decisions
Computerized treatment of all these data allows to simulate the actions and their result, allows a fast and very reactive circulation of the information between all the members of the network, reduces the redundancy of some encoding operations just as the error risk, allows a good traceability of all the decisions and operations, authorizes a real time follow-up, improves the visibility on the various sequences … Information and Communication technologies play a critical role concerning the exchange of information between suppliers, manufacturer, customers, carriers and other services providers. To be performing, every enterprise must master an information system adapted to his needs but also allowing to be networked with all the other members of the Supply chain: it is a very critical competitive advantage to be better than the competition on that aspect. But, everybody understands the major difficulty to interconnect different systems. Information must be cheap, available as soon as needed, without time lag,
1.6 Main actors
As illustrated on the figure 3, each process is requiring resources.
1.6.1 Human resources
The human resources who have an impact on the supply chain are:
q The buyers: they have to reference the suppliers who can work inside a supply chain. They must accept to work as the pilot of the supply chain decides it for the best of all the actors. The buyers must place the purchase orders when it is fixed by the Supply chain organization.
q The designers: they have to design products that it is possible to pack and transport on the best economical way. But they also must design products with the specifications that the suppliers can realize and all the actors of the supply chain can store and transport. Finally, the products must be designed with the objective to be customized at the latest stages of manufacturing.
q The packaging designers: they have to design packaging that can be economically manipulated by each member of the supply chain (size of the racks, trucks…), that correspond to the various quantities (to see §2.2) needed by the actors. It is also important that each packaging can be easily open and closed as frequently as required.
q The manufacturers: they must be flexible to accept small or large batches and evidently the must produce quality on time.
q The sellers: they must work with the precise specifications allowed by the design and with the quantities allowed by the agreement between all the parties.
q The transporters: they must deliver on time and in perfect condition.
q The warehousemen: they must act with the right diligence
q The computer operators: they must deliver the right information at the right time to the right people. Each supply chain member can recuperate the data without risk of mistake or confusion to build the appropriated management system.
1.6.2 Material resources
The material resources must be sufficient, in good conditions, available when needed and well adapted to the products and operations. These conditions are required to be able to link together many process operators. Indeed, if an operator doesn’t master well his process, it is thinkable that he will not be able to respect quality, quantity or delivery date.
This also supposes that the maintenance of all the equipments is well executed.

Load Balancing & Fault tolerance in Oracle Apps

Hello
I am pretty new to Oracle Apps and Oracle 9iAS
We are trying to asked to find out the ways of deplying load balancing and fault tolerance in Oracle Apps
I have gone thru the following articles of metalink and some more from google
Configuring Web Cache as a Load Balancer for Application Servers
Create new middle tier node in existing Apps 11i environment using cloning and then load balance
Integrating and using Web Cache with Forms 9i for Load Balancing
Running Multiple OC4J Instances From a Single Install of 9iAS 1.0.2.2
LOAD BALANCING ORACLE APPLICATIONS ON UNIX
Load Balancing in 11i
OC4J Clustering Setup
OC4J Load Balancing for Forms 9i
Setting up 11i E-Business suite using a hardware load balancer
Sharing an APPL_TOP in Oracle Applications 11i
In Oracle Apps Concepts pdf, found that
Load balancing occurs when there are multiple installations of web server, forms server, reports server, concurrent manager server etc
Lets consider forms server component of middle tier
Can there be multiple INSTANCES of forms server within SINGLE INSTALLATION ???
If it has to be MULTIPLE INSTALLATIONS, then it will require multiple physical machines
What is software load balancing then ???
Also read that
Oracle 9i AS instance is combition of Oracle HTTP Server (OHS) and one or more instances of Oracle9iAS Container for J2EE (OC4J)
Thus software load balancing can be implemented for Web server component of middle tier using multiple instances of OC4J ???
Forms metrix server configuration is hardware load balancing ??
What about Oracle9iAS Web Cache clustering ??
Please clarify the doubts and suggest me the way
Thanks a lot

dear all can any one help me on the following;
We want to install Oracle Apps 11.5.9 on 4 IBM AIX 5L boxes, the first node
will hold the database , concurrent and Admin Tiers. as for the other 3 nodes
it will hold the Forms/Web Tiers and we need to use forms metrics for load
balancing taking into consideration that we can't use Shared APPL_TOP. we tried
to find the way how to install and configure this solution but all the
documents are talking aboout the concept only and this concept is applicable.
We need the exact steps on how do the installation either using rapidwiz or any
thing else
fadi

Load Balancer and Web Dispatcher "keepalive page"

I would like our monitoring and load balancer to be able to perform http status check against SAP web dispatchers.
Is there a built in "keepalive" page that can be queried within Web Dispatcher, or will a URL rule be needed?

Dear Andrew,
We need to provide access to our intranet to some outside companies for them to also use some of our portal applications. As per your answer, I understand that I can configure Web Disptacher to talk to the Cisco Load Balancer of our portal. In this case Web Dispatcher will work just as a reverse proxy. But when I discussed this with one of our basis resource, he told me that when we install and configure Web Dispatcher, it always ask for the Message Server URL and Port number, even if I just want to use Web Dispatcher as a Reverse Proxy. If his concerns are valid, I do not think I will be able to configure Web Dispatcher to access the cisco Load Balancer because I cannot put Cisco load banacer URL and port instead of the Message Server URL and Post Number. Can you kindly share your comment on the same?
Now the second part of my question, if Web Dispatcher cannot be configured to talk to Load Balancer(as mentioned by our basis resource), I will have to use two load balancers. One web Dispatcher in DMZ as a Load Balancer *** Reverse Proxy for the external users. Second the internal Cisco Load Balancer for the intranet users. So the same portal will be accessed by two load balancers. My question here is, in this set up, can the portal work efficieintly here by distributing equal loads two both the server instances?
Thank You,
mansooralip1

Load Balancing on OC4J standalone

Ola,
We are setting up a system with 2 Apache web servers and 2 hosts for Oracle Containers for Java. At first, > we will be using stand-alone oc4j. Web servers load balancing will be implemented via hardware. Our
question is about high availability with oc4js, and searching through the OTN forum database, we found a
very similar problem with Zhen Kun Cua (how can i use the nested table in form 6i but no answer
was given.
How can we replicate Load Balancers (we are using oc4js loadbalancer.jar) as to save the system from going > down with a crash of the first load balancer? Also, is there another way of clustering oc4j stand-alone
without using this load balancer? We might be using another hardware load balancer for the containers.
Any help would be much appreciated.
Thanks you in advance,
Joco Bosco

For OC4J questions, try the J2EE forum Products>Application Server > J2EE.
Thanks,
Ashesh Parekh

Load balancing HTTP requests for an OC4J instance w/multiple JVMs

Hello everyone,
I am using OAS 10.1.3.1 and wish to load balance HTTP requests across an OC4J group of one or more OC4J instances, where each like named OC4J instance may have multiple JVMs or it may just have one JVM.
My mod_oc4j.conf file would contain the following directives :
Oc4jSelectMethod roundrobin:local
Oc4jRoutingMode Static
Oc4JMount /xyz/* xyz
In the degenerate case, I would like to have an OC4J group with a cluster size of one, and have that one OC4J instance have two or more JVMs. I would like to be able to receive a request within my web application, determine that the JVM that has been sent the request is the wrong JVM to process the request, and then call HttpServletResponse.sendRedirect("/xyz"). Then, when the browser receives the HTTP 302 response and issues the subsequent HTTP request, have that request sent to a different JVM than the previous JVM that issued the sendRedirect().
What I have seen is that the subsequent request is sent back to the same JVM that issued the sendRedirect(). I also call invalidate() against the HttpSession prior to calling sendRedirect(), but that does not seem to affect the behavior that I see.
In the full blown case, I would have an OC4J group with a cluster size > 1, and each of those OC4J instances would have at least one JVM. In that case, I wish the sendRedirect() call to allow the subsequent request to be sent to any one of the OC4J instances in the group, and any one of those JVMs within all of those OC4J instances.
Can anyone verify that my mod_oc4j mount directive is appropriate given the select method and routing mode? What else might I need to do to have a chance to have a different JVM respond to the request that results from a sendRedirect()?
Thank you,
Doug

I should clarify that in the full blown environment, the OC4J instances that form a group will each be housed within a separate OAS instance that resides on its own machine.
So ideally, a request could be inbound to say OAS instance 1 on machine A, OC4J instance AA, JVM 2, and I need to force a redirect so that the request can actually be serviced by OAS instance 3 on machine C, OC4J instance AA, JVM 1, and I need to be able to call sendRedirect() against an HttpServletResponse from within a JVM until the subsequent request from the browser, Internet Explorer in my case, is serviced by that JVM.
Thanks,
Doug

How to monitor targets which are controlled by LOAD BALANCING mechanism

Hi,
I have installed Enterprise Manager 10.1.0.3 and upgraded it to 10.1.0.5. Then i have applied the Application plug-in patch for managing Oracle Applications.In my environment, we have two concurrent managers and four forms servers which are using Load Balancer.Please let me how to manage these concurrent managers and forms servers in that scenario.Would highly appreciate your suggestions regarding the same.Thanks in advance.
Regards,
Vamsi Manyam

This note shows how to configure OEM behind a load balancer.
The question was how to use OEM, not behind a load balancer, to monitor other targets which are behind one or different load balancers.
For example, to monitor :
Forms on server A and B behind load balancer LB1.
Forms on server C and D behind load balancer LB1.
Forms on server E and F behind load balancer LB2.
Gary

Load Balancing - OC4J - J2EE

Hello,
I am trying to do software load balancing on the Applicatoin tier of Oracle Apps 11.5.9 (which uses 9iAS version 2.0, I suppose)
Going thru the follow metalink documents ---
Configuring Multiple OC4J Instances as a High Availability Cluster
(http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=175593.1)
Running Multiple OC4J Instances From a Single Install of 9iAS 1.0.2.2
(http://metalink.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=153325.1)
But I am unable to find the directory 'j2ee' in 9iAS ORACLE_HOME wherein I need to modify the configuration files
Is there any version probelm
Or something that I am doing wrong
Please let me know
Thanks and Regards,
Pooja

Pooja,
I am unable to find the directory 'j2ee' in 9iAS
ORACLE_HOMEThat's because ORACLE_HOME for 9iAS is different to ORACLE_HOME for the Oracle database (server).
On our SUN [sparc] Solaris 9 machine:
[9iAS] ORACLE_HOME = /u/app/oracle/product/ias
[9i Database] ORACLE_HOME = /u/app/oracle/product/9.2.0
And the "j2ee" subdirectory is under "/u/app/oracle/product/ias"
Good Luck,
Avi.

Load Balancing Oracle BI Presentation Server with OC4J

Hello All,
Is there a way to perform Load Balancing Oracle BI Presenation Server the way we do with IIS (defining in ISAPIConfig.XML file)?
I am looking some pointers towards Clustering/Load Balancing Oracle BI Presentation Servers using OC4J not IIS.
Thank you.

Thanks , the Oracle BI Presentation Server is running now ,but still the oc4j display the below error :-
C:\OracleBI\oc4j_bi\bin>oc4j.cmd -start
Starting OC4J from C:\OracleBI\oc4j_bi\j2ee\home ...
10/05/06 13:58:31 Error initializing server: /C:/OracleBI/oc4j_bi/j2ee/home/conf
ig/server.xml, Fatal error at line 1 offset 1 in file:/C:/OracleBI/oc4j_bi/j2ee/
home/config/server.xml: .<Line 1, Column 1>: XML-20108: (Fatal Error) Start of r
oot element expected.
10/05/06 13:58:31 Fatal error: server exiting

Load balancing in OC4J

I have a configuration where I can see in the EM two instances of the xmlpserver (I am not sure how this was done).
Is there load balancing in OC4J itself, where a request would be directed to either instance? If this is happening, then I assume that session affinity is maintained by cookies.
The problem that I am having is that I am using a SOAP Client to access the services available from xmlpserver. The client does not support cookies so when I make a call to login, I get back a token in the response and my subsequent calls should use that login. But What is happening is that the calls are alternating between the two instances and the calls are failing because the user session is not created in both instances.
Is there a configuration in OC4J to say that only a particular instance should always handle all the soap calls?
Thanks

C:\product\10.1.3.1\OracleAS_1\opmn\bin>opmnctl status
Processes in Instance: SOA1013.stbde01.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 7640 | Alive
OC4JGroup:default_group | OC4J:bianalytics | 4632 | Alive
OC4JGroup:default_group | OC4J:bijmx | 3204 | Alive
OC4JGroup:default_group | OC4J:home | 2792 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 7912 | Alive
C:\product\10.1.3.1\OracleAS_1\opmn\bin>opmnctl @cluster status
Processes in Instance: SOA1013.stbed37.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 4112 | Alive
OC4JGroup:default_group | OC4J:bijmx | 4008 | Alive
OC4JGroup:default_group | OC4J:home | 8008 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 6700 | Alive
Processes in Instance: SOA1013.staid06.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bianalytics | 5304 | Alive
OC4JGroup:default_group | OC4J:bijmx | 5324 | Alive
OC4JGroup:default_group | OC4J:home | 1768 | Alive
ASG | ASG | N/A | Down
Processes in Instance: SOA1013.stbde02.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bianalytics | 2528 | Alive
OC4JGroup:default_group | OC4J:bijmx | 2400 | Alive
OC4JGroup:default_group | OC4J:home | 2424 | Alive
ASG | ASG | N/A | Down
Processes in Instance: SOA1013.stbde01.us.oracle.com
--------------------------------------------------------------+---------
ias-component | process-type | pid | status
--------------------------------------------------------------+---------
OC4JGroup:default_group | OC4J:bixmlpserver | 7640 | Alive
OC4JGroup:default_group | OC4J:bianalytics | 4632 | Alive
OC4JGroup:default_group | OC4J:bijmx | 3204 | Alive
OC4JGroup:default_group | OC4J:home | 2792 | Alive
ASG | ASG | N/A | Down
HTTP_Server | HTTP_Server | 7912 | Alive
Time: 9:26 AM PST
Thanks
Richard

Monitoring oc4j load balancing

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