By default, Lync organizes contacts by ________

Give an example of a schedule that could be produced at SNAPSHOT isolation in which there are two transactions that execute concurrently but do not have the same snapshot number and do not see the same snapshot of the database. (Hint: the schedule can contain more than two transactions.)

What will be an ideal response?

____________ are markers that are placed in an application, indicating the program should halt execution when it reaches that point.

Fill in the blank(s) with the appropriate word(s).