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Guarantees that the set of data seen by a statement is consistent with respect to a single point-in-time and does not change during statement execution (atomic operations or statement-level read consistency)
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Ensure that readers of database data do not wait for writers or other readers of the same data
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Ensure that writers of database data do not wait for readers of the same data
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Ensure that writers only wait for other writers if they attempt to update identical rows in concurrent transactions
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The simplest way to think of Oracle's implementation of read-consistency is to imagine each user operating a private copy of the database, hence called the multi-version consistency model
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