Discussion
An Oracle System Change Number (SCN):
Answer: D
Correct answer: is a value that is incremented whenever database changes are made.
The system change number is a database-wide counter advanced whenever a change is committed, and it stamps every change in the redo stream and every datafile header. It is what allows Oracle to establish the ordering of changes, to determine whether a set of files is consistent, and to recover to a chosen point in time.
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