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Managing Multiuser Databases

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

implicit locks
explicit locks
shared locks
exclusive locks

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Managing Multiuser Databases
Locks placed by command are implicit locks.

False
True

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Managing Multiuser Databases
In this instance, dirty reads are disallowed, while nonrepeatable reads and phantom reads are allowed.

Read uncommitted
Read committed
Serializable
Repeatable read

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

Serializable
Repeatable read
Read uncommitted
Read committed

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Managing Multiuser Databases
Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?

Keyset
Forward only
Dynamic
Static

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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?

Dirty read
Phantom read
Nonrepeatable read
Consistent read

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