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

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

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Managing Databases with Oracle
Which statement about sequences is not true?

Sequences are most often used to provide values for surrogate keys.
Sequences guarantee valid surrogate key values.
NextVal and CurrVal are both sequence methods.
A sequence is an object that generates a sequential series of unique numbers.

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