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 modifying table columns?

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 can drop a column at any time.
You cannot increase or decrease the number of decimal places.

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