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Managing Multiuser Databases

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.

True
False

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Managing Multiuser Databases
A durable transaction is one in which all committed changes are permanent.

False
True

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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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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.

True
False

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Managing Multiuser Databases
In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.

Serializable
Read committed
Repeatable read
Read uncommitted

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Managing Multiuser Databases
Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.

True
False

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