Managing Databases with Oracle
What is the type of Oracle backup in which all uncommitted changes have been removed from the datafiles?

Differential backup
Inconsistent backup
Full backup
Consistent backup

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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 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 cannot increase or decrease the number of decimal places.

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

is a value that keeps track of explicit locks.
is incremented whenever a deadlock occurs.
is a value that is incremented whenever database changes are made.
is a value that is incremented whenever a dirty read occurs.

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