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To reinforce the concept of establishing relationships between tables, let me give you another way of looking at the relationship in this exercise. There are two reasons why the ColorID column is in the Listing table as an FK. The first reason is that it is used for a normalization and design principle because you don t want to have duplicate data. The second reason is that it is used for data integrity reasons and, more specifically, for the orphaned rows problem. Let s look at it with some sample data. Suppose there is a Color row called Dark Blue and the Listing table contains six different ad definitions that are Dark Blue. If you remove the Dark Blue color from the Color table, it would mean that those six ads would have orphaned data. That is why you created a foreign key relationship: to make sure that if an application or a user tries to remove data in the Color table, a process within SQL Server 2005 would prevent this by validating that there are no kids left behind in the Listing table before allowing the deletion to occur in the Color table.

anism to create a section of code that only a single thread can access at a time. This is accomplished by acquiring a lock on an object. If the object is currently locked, the thread must wait until the lock is released.

Figure 3-2

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The first thing to note on the diagram is the infinity symbol located close to the Listing table and the yellow key located close to the Color table. The infinity symbol on the Listing table indicates the table s cardinality. It indicates that, in this relationship, the Listing table can contain many rows with information coming from the matching primary key table. The yellow key indicates from which table the primary key is coming. I rearranged the diagram so that the two tables are close together. You can rearrange your tables any way you want by dragging them by the title bar (i.e., where the table name is displayed). This is sometimes necessary to do when you create relationships so that you do not end up with an unusual-looking diagram. I suggest that you put your Listing table in the middle of your other tables because it will be easier to create relationships this way. You can also rearrange the tables on your diagram at any time by right-clicking anywhere except on a table on the diagram s designer surface and selecting Arrange Tables. You can also have the labels for every relationship appear on the diagram by right-clicking the diagram s designer surface and selecting Show Relationship Labels, as shown in Figure 8-12.

Suppose you had a class with three data elements in it. One approach would be to restrict access based on the class as a whole. This would mean that only one of the three data elements could be changed at once. If these elements were independent, this might be too restrictive. An alternative would be to have three objects that serve as locks. In order to access one of the data elements the corresponding lock would first be acquired. Figure 7.15 graphically demonstrates this design tradeoff. This introduces the concept of concurrency. Concurrency is a measure of how many things can happen at once. A high degree of concurrency will often produce higher performance than a low degree. The tradeoff is between concurrency and the risk of race conditions, deadlocks, and complexity. In the previous chapter we discussed deadlocks. Deadlocks are a very real problem with SyncLocks. Using the lock/SyncLock statement there is no way to time out a request for a resource. So if a thread monopolizes a resource, all other threads requesting that resource will be in a WaitSleepJoin state until the resource becomes available. To reduce the possibility of deadlock, the lock is released whenever the thread exits the locked region. This is true if an exception is raised or processing completes normally. The design constraints regarding deadlock should always be followed when using the lock/SyncLock statements. If used correctly, lock/SyncLock is a powerful means of controlling synchronization. You may be wondering how lock/SyncLock works; we ll cover that in the next section.

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