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Managing Multiuser Databases

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

False
True

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Managing Multiuser Databases
Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?

Phantom read
Dirty read
Nonrepeatable read
Consistent read

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Managing Multiuser Databases
Locks placed by command are implicit locks.

True
False

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Managing Multiuser Databases
Which of the following locks the item from access of any type?

Shared lock
Implicit lock
Explicit lock
Exclusive lock

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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:

consistent.
durable.
atomic.
isolated.

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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.

False
True

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