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} The (Book) notation in the second statement of the CheckOut method is known as a cast. The .NET Framework collection classes are extremely powerful because they ll hold any instance of any class that has the Object class as its base class. Because all classes you ll use in Visual Basic or Visual C# have Object as a base class, you can add an instance of any class you create to SortedList. The flipside of this is that anything you take out of SortedList is considered to be an Object. The cast (Book) lets the compiler know that you re taking out a Book instance so that you can use the Book properties and methods.

This query selects just the data from partition 1. Once you are certain of the partition number, you are free to move the data. There are several options for ALTER TABLE SWITCH, including the following:

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10. Click Test Connection and then click OK to close the message box. 11. Click OK to close the Connection Manager dialog box. 12. Click Next. 13. On the Impersonation Information page of the Data Source Wizard, click Use The Service Account and click Next. Here you can see that the default data source name matches the name of the database that you selected in the Connection Manager dialog box. It s generally recommended to keep the data source name in your project consistent with the name of the database so that anyone reviewing the project files can tell at a glance where to find the source data for cube. 14. To complete the wizard, click Finish.

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ANSI Warnings Enabled should be set to TRUE when creating or manipulating indexes on computed columns or indexed views.

this chapter and make sure that you have a conversation with your DBA about the reasons for each rule. When you are building a new feature and changing a database application, it may be completely appropriate to use a hint or to alter these development practices. The goal of this section is to help you understand the purpose of each hint. I hope that this lets you see the situations when it might be appropriate to use a hint (and when it might not be appropriate). Query and table hints are, in almost all cases, actually requirements given by the query author to the Query Optimizer when generating a query plan. So, if a hint cannot be satis ed, the Query Optimizer actually returns an error and does not return a plan at all. Locking hints are an exception these are sometimes ignored to preserve the correctness of data manipulation operations necessary for the system to work properly. The name is somewhat misleading, but this behavior allows you to modify the query and know that you had an impact on the query generation process.

However, if you run the allocation query again, you ll still see two row-over ow pages: one for the row-over ow data and one for the IAM page. Now reduce the size of the rst column by more than 1,000 bytes and run the allocation query once more:

Table 2-1.

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simple plan. However, if the constraint has been disabled and re-enabled without using the WITH CHECK option, there is no guarantee that some of the data in the table won t meet the integrity requirements. You might not have any data less than or equal to 0, but the Optimizer cannot know that when it is devising the plan; all the Optimizer knows is that the constraint cannot be trusted. The catalog views sys.check_constraints and sys.foreign_keys each have a column called is_not_trusted. If you re-enable a constraint and don t use the WITH CHECK option to tell SQL Server to revalidate all existing data, the is_not_trusted column is set to 1. Although you cannot use ALTER TABLE to disable or enable a PRIMARY KEY or UNIQUE constraint, you can use the ALTER INDEX command to disable the associated index. I ll discuss ALTER INDEX in 6. You can use ALTER TABLE to drop PRIMARY KEY and UNIQUE constraints, but you need to be aware that dropping one of these constraints automatically drops the associated index. In fact, the only way to drop those indexes is by altering the table to remove the constraint.

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