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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Creating an Index with the Table Designer
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As you may recall from the previous chapter, when the CustomerId column was set up, SQL Server automatically generated the data within this field whenever a new record was inserted into this table. This data will never alter, as it uses the IDENTITY function for the column. Thus, the CustomerId column will be updated automatically whenever a customer is added. An application written in, for example, C# could be used as the user front-end for updating the remaining areas of the customer s data, and it could also display specific customer details, but it would not know that the CustomerId requires incrementing for each new record, and it would not know the value to start from. The first index created will be used to find the record to update with a customer s information. The application will have found the customer using a combination of name and address, but it is still possible to have multiple records with the same details. For example, you may have John J. Doe and his son, John J. Doe, who are both living at the same address. Once you have those details displayed on the screen, how will the computer program know which John J. Doe to use when it comes to completing an update Instead of looking for the customer by first name, last name, and address, the application will know the CustomerId and use this to find the record within SQL Server. When completing the initial search, the CustomerId is returned as part of the set of values, so when the user selects the appropriate John J. Doe, the application knows the appropriate CustomerId. SQL Server will use this value to specifically locate the record to update. In the following exercise, we ll add this index to the Customers table.
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Try It Out: Creating an Index Graphically
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1. Ensure that SQL Server Management Studio is running and that you have expanded the nodes in the tree view so that you can see the Tables node within the ApressFinancial database. 2. Find the first table that the index is to be added to (i.e., the CustomerDetails.Customers table). Right-click and select Modify. This will bring you into the table designer. Right-click and select Manage Indexes and Keys (see Figure 6-1).
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Figure 6-1. The Manage Indexes and Keys button 3. The index-creation screen will appear. Click the Add button to select the index s properties. The screen will look similar to Figure 6-2. The fields in this dialog box are prepopulated, but you are able to change the necessary fields and options that you might wish to use. However, no matter what indexes have been created already, the initial column chosen for the index will always be the first column defined in the table.
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CHAPTER 6 CREATING INDEXES AND DATABASE DIAGRAMMING
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Figure 6-2. The Indexes/Keys dialog 4. The first area to change is the name of the index. Notice that in the (Name) text box, SQL Server has created a possible value for you. The name is prefixed with IX_, which is a good naming system to use. It is also good to keep the name of the table and then a useful suffix, such as the name of the column. In this case, the index will be called IX_Customers_CustomerId. It might also be good to place something in the description. However, index names should be self-explanatory, so there really shouldn t be a need for a description. 5. SQL Server has, in this instance, correctly selected CustomerId as the column that will make up the index. Also, it has selected that the index will be ascending. For this example, the default sort order is appropriate. The sort order of the index column is useful when creating an index on the columns that will be used in an ORDER BY clause of a query when there are multiple columns with differing sort orders. If the sort order of the columns within the index matches the sort order of those columns specified in the ORDER BY clause, SQL Server may be able to avoid performing an internal sort, resulting in improved query performance.
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Tip If an index is only one column, SQL Server can read the index just as fast in a forward direction as it
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