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In most Oracle configurations, there is a one-to-one
correspondence between the database (disk files) and
the instance (memory structures). When an Oracle
database opens, a lock is placed on these datafiles.
If another instance attempts to open with any of these
datafiles, it won't be able to obtain the lock that
has been placed on these files. So an error is raised,
and the second instance will not start.
The exception to this is Oracle Parallel Server (OPS).
This has been renamed to Real Application Clusters
(RAC) for 9i. OPS and RAC let you have multiple
instances connected to the same database. For More Information
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