Before You Begin in VS .NET

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Before You Begin
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To complete the lessons in this chapter, you must have:
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SQL Server 2005 installed. A connection to a SQL Server 2005 instance. A copy of the AdventureWorks sample database.
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Using Transact-SQL to Manage Databases
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Randy Dyess Having been a DBA for many years in a large variety of environments, I have been responsible for the maintenance of literally thousands of SQL Server databases. The main responsibility of DBAs is keeping their databases up and running in the best possible condition. To achieve this goal, database maintenance is often one of the first tasks new DBAs learn as they begin their career managing SQL Server. The ability to perform database maintenance in a scriptable manner by using Transact-SQL helps newer DBAs transition from managing one database at a time to managing numerous databases at the same time. This multitasking skill is vital to the growth and productivity of DBAs as they efficiently manage applications and serve end users.
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Lesson 1: Managing Index Fragmentation
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Lesson 1: Managing Index Fragmentation
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Indexes are an essential component for ensuring optimum query execution. Proper indexing often is the difference between substandard query execution and exceptional query execution. However, unlike other objects created in SQL Server 2005, indexes can lose their effectiveness over time if they are not properly maintained because of fragmentation of the index pages supporting the indexes. The level of index fragmentation and the degree of index maintenance you perform as a DBA often determine which indexes the SQL Server query optimizer uses to execute the query successfully and which indexes the optimizer does not use for any queries. The optimizer could also end up using indexes that have a large degree of fragmentation, which actually hurts a query s performance. This lesson covers the types of index fragmentation your indexes could suffer from, how to identify index fragmentation, and which statements you should issue to correct different types of index fragmentation.
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After this lesson, you will be able to:
Understand index fragmentation. Identify index fragmentation. Effectively manage index fragmentation levels by using Transact-SQL.
Estimated lesson time: 30 minutes
Understanding Index Fragmentation
Index fragmentation can occur whenever data in a table is modified and this modification affects an index page. Whenever a process performs an INSERT, DELETE, or UPDATE operation against the data in a table, the corresponding clustered and nonclustered indexes for that table are affected as well.
NOTE
Index pages and data pages in SQL Server 2005
A SQL Server 2005 index can contain both index pages and data pages. Clustered and nonclustered indexes both contain index pages that hold information about the index key values and information about any pointers to the rest of the data in the table that are needed by the index. However, only clustered indexes contain data pages; the bottom level of a clustered index is actually the table data itself not index rows containing pointers to the table data, as in nonclustered indexes.
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Using Transact-SQL to Manage Databases
Processes performing DELETE operations often cause space in the underlying index pages to be freed, which can cause an index s pages to contain only a fraction of the index rows they would normally hold if they were full. The condition when pages are not as full as they should be is called internal fragmentation. With internal fragmentation, index pages do not use disk space efficiently, which leads to an increase in the number of pages needed to hold the same number of index rows. This increase in the number of pages causes SQL Server to read a larger number of pages into memory to satisfy a READ operation against an index. Paging is the physical act of retrieving the data or index pages from the hard disk subsystem into memory. Because the hard disk subsystem is typically the slowest component on a server, any actions that you can take to reduce the amount of paging improve the overall performance of SQL Server. INSERT and UPDATE operations can cause SQL Server to create additional index pages if the page in which it needs to place the index row or data row already contains the maximum amount of information a single data or index page can contain.
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