RAC vs Parallel server


In oracle 9i edition, there is a term called Real Application Cluster (RAC).
In addition, in oracle 8i, another term parallel server is used.

What is the difference between RAC and Parallel server?
Please advise. Thanks.
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gattu007Connect With a Mentor Commented:
There have been lot of enhancements been made to parallel server and had been named RAC.

Infact there are architectural changed made and oracle has come up with its own clusterware / cluster file system in RAC.

for more details pls refer below note from metalink

Subject:       Documentation Index for Real Application Clusters
        Doc ID:       Note:188135.1
johnsoneSenior Oracle DBACommented:
RAC is parallel server renamed.  The underlying technology changed so they changed the name.
iecuAuthor Commented:
Hi gattu007,
As I don't have a login a/c in metalink, could you briely describe what is new in RAC?

In your previous message, do you mean that OCFS is a new feature in Oracle 9i?
If yes, what is the advtange in using this file system?

Please advise. Thanks.

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