Managing Databases with Oracle
What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles?

Consistent backup
Inconsistent backup
Differential backup
Full backup

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Managing Databases with Oracle
An Oracle System Change Number (SCN):

is a value that is incremented whenever a dirty read occurs.
is incremented whenever a deadlock occurs.
is a value that is incremented whenever database changes are made.
is a value that keeps track of explicit locks.

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