Compare and Constrast Essay on Computer

This essay has a total of 1290 words and 6 pages.

computer

Twenty-five years ago, Larry Ellison saw an opportunity other companies missed when he
came across a description of a working prototype for a relational database and discovered
that no company had committed to commercializing the technology. Ellison and his
co-founders, Bob Miner and Ed Oates, realized there was tremendous business potential in
the relational database model--but they may not have realized that they would change the
face of business computing forever.

Today Oracle (Nasdaq: ORCL) is still at the head of the pack. Oracle technology can be
found in nearly every industry around the world and in the offices of 98 of the Fortune
100 companies. Oracle is the first software company to develop and deploy 100%
internet-enabled enterprise software across its entire product line: database, business
applications, and application development and decision support tools. Oracle is the
world's leading supplier of software for information management, and the world's second
largest independent software company.

Oracle has always been an innovative company. It was one of the first companies to make
its business applications available through the internet--today, that idea is pervasive.
Now Oracle is committed to making sure that all of its software is designed to work
together--the suite approach--and other companies, analysts, and the press are beginning
to acknowledge that Oracle is right. What's in store for tomorrow? We will continue to
innovate and to lead the industry--while always making sure that we're focused on solving
the problems of the customers who rely on our software
(http://www.oracle.com/corporate/index.html?story.html)

We will first look at the hardware and software platforms to see how they measure up, and
what, if any, special requirements are needed, as well as the costs that are associated
with them. Next, we will look at the deployment of the application and what it takes to
roll out a production system. Once the application is up and running, performance becomes
the top priority of the data center. We can first note that the hardware and software
requirements are similar. The abstraction to the application is also the same with both
solutions - it gives an illusion of a single database and there is no need to modify the
SQL code. The differences are in ease of deployment, performance and manageability.


Both databases have similar cluster hardware requirements. A cluster is a group of
independent servers that collaborate as a single system. The primary cluster components
are processor nodes, a cluster interconnect (private network), and a disk subsystem. The
clusters share disk access and resources that manage the data, but each distinct hardware
cluster nodes do not share memory. Eachnode has its own dedicated system memory as well as
its own operating system, database instance.


Clusters can provide improved fault resilience and modular incremental system growth over
single symmetric multi-processors systems. In the event of subsystem failures, clustering
ensures high availability. Redundant hardware components, such as additional nodes,
interconnect, and shared disks, provide higher availability. Such redundant hardware
architectures avoid single points of-failure and provide exceptional fault resilience.
From a conceptual view, the cluster requirements for RAC and DB2 are similar, especially
when high availability (HA) is a basic requirement. In a cluster, CPU and memory
requirements for each node are similar to single systems requirements and leave no
differentiation for this discussion. However, there has been a lot of debate on the other
cluster components requirements, especially around performance and costs. The two relevant
requirements are:

¡P Cluster Interconnect
¡P Shared disk vs. shared-nothing storage
Cluster Interconnect
Each node in a cluster needs to keep other nodes in that cluster informed of its health
and configuration. This is done periodically by broadcasting a network message, called a
heartbeat, across a network. The heartbeat signal is usually sent over a private network,
the cluster interconnect, which is used for internodecommunications. This cluster
interconnect is built by installing network cards in each node and connecting them by an
appropriate network cable and configuring a software protocol to run across the wire. This
interconnect can be a low cost Ethernet card running TCP/IP or UDP or a high-speed
proprietary interconnect like Compaq¡¦s Memory Channel running Reliable DataGram (RDG)
Continues for 3 more pages >>




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