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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
Resource locking is a process to prevent multiple applications from obtaining copies of the same record when the record is about to be changed.

False
True

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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.

True
False

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

Read uncommitted
Serializable
Read committed
Repeatable read

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Managing Multiuser Databases
Locks placed by command are called ________ .

exclusive locks
shared locks
implicit locks
explicit locks

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Managing Multiuser Databases
A transaction in which either all of the database actions occur or none of them do is called:

atomic.
isolated.
durable.
consistent.

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