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

Inconsistent backup
Full backup
Consistent backup
Differential backup

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

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