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

is a value that is incremented whenever a dirty read occurs.
is a value that keeps track of explicit locks.
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 of SQL views?

Oracle views are created using the standard SQL-92 CREATE VIEW command.
Oracle views can by queried.
The SQL-92 standard does not allow the use of the ORDER BY clause in view definitions.
Oracle views cannot use the ORDER BY clause in view definitions.

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

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

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