Managing Multiuser Databases - General Questions (2)

A transaction in which either all of the database actions occur or none of them do is called:

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

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

Which of the following refers to a cursor type where changes of any type and from any source are visible?

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?

The advantage of optimistic locking is that:

Which of the following occurs when a transaction rereads data it has previously read and finds modification or deletions caused by a committed transaction?

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