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Managing Multiuser Databases

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

False
True

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Managing Multiuser Databases
Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur?

Repeatable read
Read committed
Read uncommitted
Serializable

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Managing Multiuser Databases
When one transaction reads a changed record that has not been committed to the database a filthy read occurs.

True
False

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

Serializable
Read uncommitted
Read committed
Repeatable read

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

Read uncommitted
Repeatable read
Serializable
Read committed

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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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