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Answer Posted / brajendra arzare
Oracle RAC allows multiple computers to run the Oracle
RDBMS software simultaneously while accessing a single
database, thus providing a clustered database.
In a non-RAC Oracle database, a single instance
accesses a single database. Where the "database" consists
of a collection of data files, control files, and redo logs
located on disk; the "instance" comprises the collection of
Oracle-related memory and operating system processes that
run on a computer system.
In an Oracle RAC environment, two or more computers (each
with an instance) concurrently access a single database.
This allows an application or user to connect to either
computer and have access to a single coordinated set of
data.
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