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Managing Multiuser Databases

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

Exclusive lock
Implicit lock
Explicit lock
Shared lock

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Managing Multiuser Databases
Database administration refers to a function that applies to the entire organization.

False
True

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

Read committed
Repeatable read
Read uncommitted
Serializable

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

explicit locks
exclusive locks
shared locks
implicit locks

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Managing Multiuser Databases
The goal of database security is to ensure that only authorized users can perform authorized activities at authorized times.

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
Consistent read
Nonrepeatable read

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