1 | 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) |
2 | Ensure that readers of database data do not wait for writers or other readers of the same data |
3 | Ensure that writers of database data do not wait for readers of the same data |
4 | Ensure that writers only wait for other writers if they attempt to update identical rows in concurrent transactions |
5 | 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 |