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BEGIN TRANSACTION UPDATE [AdventureWorks].[Production].[WorkOrder] SET [OrderQty] = [OrderQty]+1 WHERE [DueDate] = '20040630' AND [OrderQty] = 12345678 UPDATE [AdventureWorks_Copy].[Production].[WorkOrder] SET [OrderQty] = [OrderQty]+1 WHERE [DueDate] = '20040630' AND [OrderQty] = 12345678 ROLLBACK

Here s an example using the creator code, which works in just the same way:

As you ve seen, in some rare cases a covering index may speed up an update, if it makes it easier to locate the rows being modified.

Refer to the text in this chapter if necessary A good score is 18 correct Answers are in the back of the book 1 A young person can hear sounds at frequencies as high as approximately which of the following (a) 20 Hz (b) 20 kHz (c) 20 MHz (d) 20 GHz 2 Electromagnetic interference to a hi-fi amplifier can occur in the presence of (a) a nearby radio broadcast station (b) improperly designed receiving antennas (c) excessive utility voltage (d) improper balance between the left and right channels 3 The midrange audio frequencies (a) are exactly halfway between the lowest and highest audible frequencies (b) represent sounds whose volume levels are not too loud or too soft (c) are above the treble range but below the bass range (d) None of the above are true 4 In the acoustical design of a room intended for a home audio system, (a) the use of small speakers can minimize distortion (b) reflection of sound waves from walls should be minimized (c) the walls should all intersect at perfect 90 angles (d) wooden furniture, without upholstery, should be used

Suppose that you have a table with a clustered index and two nonclustered indexes. Inserting one row into such a table means that at least three pages need to be modified or added (maybe more than three if there s a page split). The more nonclustered indexes you add on a table, the more pages a single-row insert must modify or insert. Similar reasoning is true for multi-row modifications, including updates and deletes their real execution costs increase as the number of indexes grows. This is why it s important to keep the number of indexes low for tables that are frequently modified. For example, consider two separate indexes on the [Person].[Contact] table, each covering a different SELECT statement as described in listing 6.

To find out the bundle identifier or creator code for an application, return its id property For example, the following statement returns the bundle identifier of iTunes:

CREATE NONCLUSTERED INDEX [IX_Contact_Covering1] ON [Person].[Contact] ( [LastName], [FirstName], [EmailAddress] ) GO -- covers the following query: SELECT [LastName], [FirstName], [EmailAddress] FROM [Person].[Contact] WHERE [LastName] LIKE 'Lars%' GO CREATE NONCLUSTERED INDEX [IX_Contact_Covering2] ON [Person].[Contact] ( [LastName], [FirstName], [Phone] ) GO -- covers the following query: SELECT [LastName], [FirstName], [EmailAddress] FROM [Person].[Contact] WHERE [LastName] LIKE 'Lars%' GO