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Managing Multiuser Databases

Managing Multiuser Databases
Locks placed by the DBMS are called ________ .

shared locks
implicit locks
exclusive locks
explicit locks

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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
Which of the following locks the item from change but not from read?

Explicit lock
Shared lock
Exclusive lock
Implicit lock

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

Repeatable read
Read uncommitted
Read committed
Serializable

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Managing Multiuser Databases
Locks placed by command are called ________ .

explicit locks
implicit locks
exclusive locks
shared locks

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Managing Multiuser Databases
Which of the following occurs when one transaction reads a changed record that has not been committed to the database?

Phantom read
Nonrepeatable read
Dirty read
Consistent read

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