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Managing Multiuser Databases

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

implicit locks
exclusive locks
explicit locks
shared locks

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

Serializable
Read uncommitted
Read committed
Repeatable read

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Managing Multiuser Databases
Which of the following occurs when a transaction rereads data and finds new rows that were inserted by a command transaction since the prior read?

Phantom read
Dirty read
Nonrepeatable read
Consistent read

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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
The size of the lock is referred to as the lock granularity.

False
True

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