![](https://csdnimg.cn/release/download_crawler_static/85681010/bg4.jpg)
Technical Comparison of Oracle Real Application Clusters 11g vs. IBM DB2 v9 for Linux, Unix, and Windows
4
resources are getting what they need, that resources are not standing idle
while requests are going without being serviced. Information sharing
makes sure that the information that users and applications need is
available where and when it is needed. High availability features guarantee
all the data and computation is always available.
If virtualization and provisioning are important goals for improving your
computing infrastructure, Oracle Real Application Clusters 11g offers a more
integrated, functional, performance and cost-effective solution than the IBM DB2
offering.
Enabling Enterprise Grids
Oracle RAC 11g provides the foundation for Enterprise Grid Computing.
Enterprise Grids are built from standard, commodity servers, shared storage, and
network components. Oracle RAC is a cluster database with a shared cache
architecture that runs on multiple servers, attached through a cluster interconnect,
and a shared storage subsystem. Oracle RAC 11g enables transparent deployment
of a single database across a cluster of servers and provides the highest levels of
availability and scalability. Nodes, storage, CPUs, and memory can all be
dynamically provisioned while the system remains online. The Grid Plug and Play
feature of Oracle RAC 11g Release 2 makes it easy to add, replace, or remove
nodes in your cluster providing a very agile infrastructure to support any
application. Once a new node has joined the cluster, a simple command extends
the database with a new instance on the new server. Clients will immediately take
advantage of the extra resources. This allows service levels to be easily and
efficiently maintained while lowering Total Cost of Ownership (TCO). Oracle RAC
provides dynamic distribution of workload and transparent protection against
system failures.
Oracle RAC is a cluster database with a shared cache architecture that overcomes
the limitations of traditional shared-nothing and shared-disk approaches to provide
a highly scalable and available database solution for all your business applications.
Oracle RAC 11g includes Oracle Clusterware, a complete, integrated cluster
management solution available on all Oracle Database 11g platforms. Oracle
Clusterware functionality includes mechanisms for cluster messaging, locking,
failure detection, and recoveryno third party Clusterware management software
need be purchased. With Oracle RAC, Oracle Database continues its leadership in
innovative database technology and widens the gap from its competitors.
Automatic Storage Management (ASM), a feature of Oracle Database, provides a
complete storage solution. There is no requirement for any third party volume
managers or file systems. ASM provides a vertically integrated file system and
volume manager, purpose-built for Oracle database files, ASM provides the
performance of async I/O with the easy management of a file system. New with
Oracle Database 11g Release 2, ASM Cluster File System (ACFS) is a POSIX and