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Managing Multiuser Databases

Managing Multiuser Databases
Two transactions that run concurrently and generate results that are consistent with the results that would have occurred if they had run separately are referred to as serializable transactions.

False
True

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

Repeatable read
Read committed
Serializable
Read uncommitted

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

implicit locks
shared locks
exclusive locks
explicit locks

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

Read committed
Read uncommitted
Serializable
Repeatable read

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Managing Multiuser Databases
When one transaction reads a changed record that has not been committed to the database a filthy read occurs.

True
False

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Managing Multiuser Databases
A cursor type in which the application can only move forward through the recordset is called:

forward only.
keyset.
dynamic.
static.

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