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

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

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Managing Databases with Oracle
Which of the following is not true about indexes?

Indexes are created to enable fast retrieval by column values.
Indexes are created to enforce uniqueness on columns.
Indexes are created with the ALTER TABLE command.
Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.

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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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