Question

What concurrent processing problem occurs when a transaction reads a changed record that has not been committed to the database?

Question options:

	Unlocked reads
	Nonrepeatable reads
	Phantom reads
	Serialized reads
	Dirty reads

The purpose of concurrency control is to:

Question options:

	Ensure that one user's work does not interfere with another's.
	Ensure that every input form has a corresponding output report.
	Ensure that no two SQL statements are executed at the same time.
	Ensure that resource locking is always used

______________________ is a popular technology designed to efficiently process large amounts of diverse types of data. Words associated with this technology include 'Pig', 'Hive', 'Zookeeper'.

Question options:

	high speed SQL processing
	data mining
	data warehousing
	hadoop

Answer 1

1)  Dirty reads
2)  ensure that one user's work does not interfere with another's.
3)  hadoop