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

is incremented whenever a deadlock occurs.
is a value that is incremented whenever a dirty read 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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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 to enable fast retrieval by column values.
Indexes are created with the ALTER TABLE command.

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