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Is Oracle Database 11g a multi-node cluster or a single node database or it could be both?

Very novice question.  Thanks.
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slightwv (䄆 Netminder) Commented:
It could be either/or but not both.

Oracle Real Application Cluster (RAC) is the multimode cluster name.
slightwv (䄆 Netminder) Commented:
A high-level explaination:

An Oracle Instance is considered the server processes and memory structures.
An Oracle Database is considered the files on disk.

An instance belongs to one and only one database.
A database can be shared by multiple instances (RAC or the older Multi-Threaded Server).
thomaszhwangAuthor Commented:
Perfect!  Thanks.
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