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

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

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

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

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

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.
is incremented whenever a deadlock occurs.

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Managing Databases with Oracle
Which of the following is not true about modifying table columns?

You can drop a column at any time.
You can increase the number of characters in character columns or the number of digits in numeric columns
You can add a column at any time as long as it is a NULL column.
You cannot increase or decrease the number of decimal places.

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