Websphere edition comparison

Related Audiobooks Free with a 30 day trial from Scribd. Who Owns the Future? Jaron Lanier. Jim Tse. Ammar Sahili. Pawan R. Show More. Views Total views. Actions Shares. No notes for slide. Delivers near-continuous availability, with advanced performance and intelligent management capabilities, for mission-critical apps.

WAS Provides secure, high performance transaction engine for moderately sized configurations with web tier clustering and failover across up to five application server profiles. Restricted to a set amount of PVUs.

Websphere also supports very high end architecture features such as clustering and high scalability. In general the choices above are listed in order of licensing cost from the lowest with JBoss to Websphere at the high end. To be fair, Websphere has more features than JBoss for the higher price.

The client applications can use these functionalities as it would call a method of an object. The application server manages its own resources like security, transaction processing, messaging, resource pooling.

There are various clients for an application server like GUIs Graphical User Interface , a web server or other applications hosted on any application servers. The information transferred between clients and application servers is not limited to displaying just the HTML files; instead, the information could be some programming logic. The client can modify the data according to his needs and use it in his applications.

WebLogic is an Oracle product that performs the role of the application server. The software application is a middleware that connects between back-end applications like databases and related applications with browser-based thin clients. WebLogic is used to develop and deploy J2EE applications.

J2EE is the standard platform for developing multitier enterprise applications based on the Java programming language. WebSphere is an IBM software that performs the role of the application server.

The primary goals of load balancing are to optimize usage of available server capacity and provide the most rapid possible response time to clients. WebSphere provides clustering and load balancing support through its Administrative Console, with cloning and workload management services. Clustering is implemented in WebSphere with a mechanism called cloning, available in the Administration system.

Cloning enables you to create multiple copies of an application server, based on a server that you have already configured. The clone has the same structure and attributes as the application server on which it is based, but it is not associated with any node, and does not correspond to any real server process running on any node.

WebSphere Application Server supports cloning for servlet engines, Web applications, and servlets for workload management, load balancing, and failover. This provides identical, yet independent processes for the application to run in. The workload management service improves the scalability of the application server environment by grouping multiple application servers into application server groups.

Clients then access these application server groups as if they were a single server, and the workload management service distributes the workload among the application servers in the application server groups. An application server can belong to only one application server group.

Websphere workload management supports load balancing for stateless servlets and stateless session beans, and provides a failover mechanism for stateful servlets and stateful session beans. Servlet load balancing is performed by a servlet redirector. The servlet redirector runs on the Web server in front of the application servers. The redirector balances workload across the servlet engines running in multiple application servers behind the Web server.

When a web server HTTP session asks to invoke a servlet, the redirector transfers the request to a servlet engine. Oracle9 i AS is designed with sophisticated clustering mechanisms. These mechanisms ensure that failover and scalibility are achieved at the infrastructure and application levels. All Oracle9 i AS instances in the cluster have the same configuration. The first Oracle9 i AS instance to join a cluster has its configuration replicated to the second and later instances when they join.

In addition to the configuration, deployed OC4J applications are also replicated to the newer instances. Information for the replicated configuration and applications is retrieved from the Oracle9 i AS infrastructure repository used by the cluster. Within each cluster, there is no mechanism to load balance or failover the Oracle9 i AS instances. That is, there is no internal mechanism in the cluster to load balance or failover requests to the Oracle HTTP Server component in the instances.

The clusters and instances in this farm share the same Oracle9 i AS infrastructure repository. An important function of clustering technology in Oracle9 i AS is that of reducing multicast traffic. With every server sharing its session state with every other server in the cluster, a lot of CPU cycles is consumed as overhead to replicate the session state across all nodes in the cluster.

Hence, state is replicated to a smaller number of processes. OC4J islands are typically configured to span across physical nodes, thereby allowing failover of application state if a node goes down. When the state of an application changes, which could occur at every request from the same client, multicast messages are sent between all four processes to update the state of that application in each process.

If these four processes were to be divided into two islands of two processes across two nodes, state replication of the application would only have to occur between processess within the same island. Multicast messages would be required only between the two processes in the island instead of four, reducing replication overhead by half.