Using Transact-SQL to Manage Databases in Visual Studio .NET

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Using Transact-SQL to Manage Databases
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You might see a result set like the one shown following (actual column names returned will depend upon your database environment):
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BirthDate MaritalStatus Gender SalariedFlag VacationHours SickLeaveHours CurrentFlag ModifiedDate
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3. In the Query Editor pane, type the following Transact-SQL statements to create statistics on the columns in the HumanResources.Employee table that do not currently have statistics on them, and then recheck for columns that do not have statistics:
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--Create statistics for the columns needing statistics. CREATE STATISTICS st_BirthDate ON HumanResources.Employee (BirthDate) WITH FULLSCAN; CREATE STATISTICS st_MaritalStatus ON HumanResources.Employee (MaritalStatus) WITH FULLSCAN; CREATE STATISTICS st_Gender ON HumanResources.Employee (Gender) WITH FULLSCAN; CREATE STATISTICS st_SalariedFlag ON HumanResources.Employee (SalariedFlag) WITH FULLSCAN; CREATE STATISTICS st_VacationHours ON HumanResources.Employee (VacationHours) WITH FULLSCAN; CREATE STATISTICS st_SickLeaveHours ON HumanResources.Employee (SickLeaveHours) WITH FULLSCAN; CREATE STATISTICS st_CurrentFlag ON HumanResources.Employee (CurrentFlag) WITH FULLSCAN;
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Lesson 2: Managing Statistics
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CREATE STATISTICS st_ModifiedDate ON HumanResources.Employee (ModifiedDate) WITH FULLSCAN; --Determine which columns still do not have statistics on them. SELECT c.name FROM sys.columns c LEFT OUTER JOIN sys.stats_columns sc ON sc.[object_id] = c.[object_id] AND sc.column_id = c.column_id WHERE c.[object_id] = OBJECT_ID( HumanResources.Employee ) AND sc.column_id IS NULL ORDER BY c.column_id;
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Practice 2: Update Statistics
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In this practice, you will manually update statistics by using the UPDATE STATISTICS statement. 1. If necessary, start SSMS and connect to the instance containing the AdventureWorks sample database. Open the Query Editor pane. 2. In the Query Editor pane, type the following Transact-SQL statements to view when the statistics were last updated, update all statistics on the HumanResources.Employee table, and check when the statistics were last updated:
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USE AdventureWorks; --View date the statistics were last updated. SELECT Index Name = i.[name] , Statistics Date = STATS_DATE(i.[object_id], i.index_id) FROM sys.objects o INNER JOIN sys.indexes i ON o.name = Employee AND o.[object_id] = i.[object_id]; --Update statistics on all indexes on the table. UPDATE STATISTICS HumanResources.Employee WITH FULLSCAN; --View date the statistics were last updated. SELECT Index Name = i.[name] , Statistics Date = STATS_DATE(i.[object_id], i.index_id) FROM sys.objects o INNER JOIN sys.indexes i ON o.name = Employee AND o.[object_id] = i.[object_id];
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Using Transact-SQL to Manage Databases
Lesson Summary
Statistics on table or view columns play an important role in optimizing query performance; the SQL Server query optimizer uses these statistics to evaluate the cost of using an index to satisfy a query. When you create an index, the query optimizer automatically stores statistical i n f o r m a t i o n a b o u t t h e i n d e x e d c o l u m n s . Yo u c a n a l s o s e t t h e AUTO_CREATE_STATISTICS database option to ON to have the database engine automatically create statistics on columns that are not contained in indexes but that are used in query predicates and to automatically update statistical information periodically as the data in the tables changes. Alternatively, you can manually create and update statistics by using TransactSQL statements and stored procedures.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which Transact-SQL function shows the last time statistics were updated for a specified index A. sys.stats_columns B. DBCC SHOWCONTIG C. DBCC SHOW_STATISTICS D. STATS_DATE 2. Which Transact-SQL statement allows SQL Server to automatically update statistics A. sp_autostats B. sys.stats C. UPDATE STATISTICS D. CREATE STATISTICS
Lesson 3: Shrinking Files
Lesson 3: Shrinking Files
In SQL Server 2005, certain operations such as large delete operations or one-time data loads might leave database files larger than they need to be. SQL Server 2005 enables a DBA to shrink each file within a database to remove unused pages and regain disk space. And although the SQL Server database engine is designed to reuse space effectively, there are times when a database or a database file no longer needs to be as large as it once was. You might then need to shrink the database or file either through a manual process of shrinking all the database files or certain files individually or by setting the database to automatically shrink at specified intervals. In this lesson, you learn how to determine when you should shrink database files and what Transact-SQL statements you can use to shrink databases and database files.
After this lesson, you will be able to:
Determine when it is appropriate to shrink database files. Use Transact-SQL statements to shrink databases and database files.
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