16. The goal of database security is to ensure that only authorized users can perform authorized activities at authorized times.

A. True
B. False

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17. A phantom read occurs when a transaction rereads data it has previously read and finds modifications or deletions caused by a committed transaction.

A. True
B. False

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18. A transaction is a series of actions to be taken on the database so that either all of them are performed successfully or none of them are performed at all.

A. True
B. False

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19. A point of synchronization between the database and the transaction log is generally referred to as a stop point.

A. True
B. False

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20. An exclusive lock locks the item from change but not from read.

A. True
B. False

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