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

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

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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.
NextVal and CurrVal are both sequence methods.
Sequences guarantee valid surrogate key values.
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 with the ALTER TABLE command.
Indexes are created to enable fast retrieval by column values.
Columns that are frequently used with equal conditions in WHERE clauses are good candidates for indexes.
Indexes are created to enforce uniqueness on columns.

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