Oracle RAC

Oracle Grid Infrastructure

ASM and Oracle Clusterware are

installed into a single home directory

called Oracle Grid Infrastructure 11g

Release 2.

This directory is referred to as the Grid

Infrastructure home.

What Is a Cluster? A group of independent, but interconnected,

computers that act as a single system

Usually deployed to increase availability and

performance or to balance a dynamically

changing workload

Oracle Clusterware

Oracle Clusterware is a key part of Oracle Grid Infrastructure,

which also includes Automatic Storage Management (ASM)

and the ASM Cluster File System (ACFS).

Oracle Clusterware Networking

Grid Plug and Play

With past releases, adding or removing

servers in a cluster required extensive

manual preparation. With the release of

Oracle Database 11g Release 2, Grid Plug

and Play (GPnP) reduces the costs of

installing, configuring, and managing

server nodes by using a Grid Naming

Service within the cluster .

Single Client Access Name

The single client access name (SCAN) is theaddress used by clients connecting to the

cluster.The SCAN is a fully qualified host name

(host name + domain) registered to three IP

addresses. If you use GNS, and you have DHCP

support, then the GNS will assign addresses

dynamically to the SCAN.

What Is Oracle ASM?

In essence, Oracle Automatic Storage

Management (ASM) is a volume manager and file

system built into the Oracle Database server