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Managing Multiuser Databases

Managing Multiuser Databases
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.

False
True

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Managing Multiuser Databases
Which of the following disallows both dirty reads and nonrepeatable reads, but allows phantom reads?

Read uncommitted
Serializable
Read committed
Repeatable read

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Managing Multiuser Databases
The transaction log contains a copy of every database record (or page) after it has changed. These records are called before images.

False
True

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Managing Multiuser Databases
When two transactions are being processed against the database at the same time they are termed concurrent transactions.

False
True

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Managing Multiuser Databases
Dirty read, nonrepeatable, and phantom reads are not possible in this instance.

Serializable
Repeatable read
Read committed
Read uncommitted

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Managing Multiuser Databases
The overall responsibility of the DBA is to facilitate the development and use of the database.

True
False

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