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 of the following is not true about indexes?

Indexes are created to enable fast retrieval by column values.
Indexes are created with the ALTER TABLE command.
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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Managing Databases with Oracle
Which of the following is not true about modifying table columns?

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

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