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What requirement does a clustered index impose on logical storage of a table A clustered index forces rows on data pages, as well as data pages within the doubly linked list, to be sorted by the clustering key.
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Lesson 2: Creating Clustered Indexes
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Create a Clustered Index
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In this practice, you will create a clustered index. You will then disable the index and reenable it. 1. Launch SQL Server Management Studio (SSMS), connect to your instance, and open a new query window. 2. Change the context to the AdventureWorks database. 3. Create a clustered index on the PostTime column of the DatabaseLog table by executing the following command:
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CREATE CLUSTERED INDEX ci_postdate ON dbo.DatabaseLog(PostTime);
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4. Run the following query to verify that data can be retrieved from the table:
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SELECT * from dbo.DatabaseLog;
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5. Disable the index by executing the following command:
ALTER INDEX ci_postdate ON dbo.DatabaseLog DISABLE;
6. Verify that the table is now inaccessible by executing the following query:
SELECT * from dbo.DatabaseLog;
7. Reenable the clustered index and verify that the table can be accessed by executing the following query:
ALTER INDEX ci_postdate ON dbo.DatabaseLog REBUILD; GO SELECT * from dbo.DatabaseLog;
Lesson Summary
You can create only one clustered index on a table. The clustered index, generally the primary key, causes the data in the table to be sorted according to the clustering key. When a clustered index is used to locate data, the leaf level of the index is also the data pages of the table. New in SQL Server 2005, you can specify online index creation, which enables users to continue to select and update data during the operation.
4
Creating Indexes
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 type of index physically orders the rows in a table A. Unique index B. Clustered index C. Nonclustered index D. Foreign key 2. Which index option causes SQL Server to create an index with empty space on the leaf level of the index A. PAD_INDEX B. FILLFACTOR C. MAXDOP D. IGNORE_DUP_KEY
Lesson 3: Creating Nonclustered Indexes
Lesson 3: Creating Nonclustered Indexes
After you build your clustered index, you can create nonclustered indexes on the table. In contrast with a clustered index, a nonclustered index does not force a sort order on the data in a table. In addition, you can create multiple nonclustered indexes to most efficiently return results based on the most common queries you execute against the table. In this lesson, you will see how to create nonclustered indexes, including how to build a covering index that can satisfy a query by itself. And you will learn the importance of balancing the number of indexes you create with the overhead needed to maintain them.
After this lesson, you will be able to:
Implement nonclustered indexes. Build a covering index. Balance index creation with maintenance requirements.
Estimated lesson time: 20 minutes
Implementing a Nonclustered Index
Because a nonclustered index does not impose a sort order on a table, you can create as many as 249 nonclustered indexes on a single table. Nonclustered indexes, just like clustered indexes, create a B-tree structure. However, unlike a clustered index, in a nonclustered index, the leaf level of the index contains a pointer to the data instead of the actual data. This pointer can reference one of two items. If the table has a clustered index, the pointer points to the clustering key. If the table does not have a clustered index, the pointer points at a relative identifier (RID), which is a reference to the physical location of the data within a data page. When the pointer references a nonclustered index, the query transits the B-tree structure of the index. When the query reaches the leaf level, it uses the pointer to find the clustering key. The query then transits the clustered index to reach the actual row of data. If a clustered index does not exist on the table, the pointer returns a RID, which causes SQL Server to scan an internal allocation map to locate the page referenced by the RID so that it can return the requested data. You use the same CREATE INDEX command to create a nonclustered index as you do to create a clustered index, except that you specify the NONCLUSTERED keyword.
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