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The leaf level of a clustered index contains the data, not just the index keys So the answer to the question What else is in the leaf level of a clustered index besides the key value is Everything else that is, all the columns of every row in the table are in the leaf level of a clustered index Another way to say this is that when a clustered index is created, the data becomes the leaf level of the clustered index At the time a clustered index is created, data in the table is copied and ordered by the clustering key Once created, a clustered index is maintained logically rather than physically This order is maintained through a doubly linked list called a page chain (Note that pages in a heap are not linked in any way to each other.

When using URLs to access reports, you can decide how report parameters should be handled. To override the default values established for the report, you

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) The order of pages in the page chain, and the order of rows on the data pages, is based on the de nition of the clustered index Deciding on which column(s) to cluster is an important performance consideration Because the actual page chain for the data pages can be ordered in only one way, a table can have only one clustered index And, in general, most tables perform better when the table is clustered However, the clustering key needs to be chosen wisely And, to appropriately choose a clustering key, you must understand how the clustered index works, as well as the internal dependencies on the clustering key (especially as far as the nonclustered indexes are concerned) The dependencies of the nonclustered indexes on the clustering key have been in SQL Server since the storage engine was rearchitected in SQL Server 70.

After you set the relay options, click OK. In the Routing And Remote Access console, rightclick the DHCP Relay Agent entry, and choose Properties. This displays the DHCP Relay Agent Properties dialog box. Type the IP address of the DHCP server to which DHCP packets should be forwarded, and then click Add. Click OK. The computer is then configured as a DHCP relay agent.

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It all starts with how rows are identi ed (and looked up) when using a nonclustered index to reference a corresponding row within the table If a table has a clustered index, then rows are identi ed (and looked up by) their clustering key If the table does not have a clustered index, then rows are identi ed (and looked up by) their physical row identi er (RID), described in more detail later in this chapter This process of looking up corresponding data rows in the base table is known as a [bookmark] lookup, which is named after the analogy that nonclustered indexes reference a place within a book, as a bookmark does Nonclustered indexes contain only the data as de ned by the index.

When looking up a row within a nonclustered index, you often need to go to the actual data row for additional data that s not part of the nonclustered index To retrieve this additional data, you must look into the table for that data For the purpose of this section, we focus only on how the bookmark lookup is performed when a table is clustered First, and foremost, all clustered indexes must be unique The primary reason why a clustered index must be unique is so that nonclustered index entries can point to exactly one speci c row Consider the problem that would occur if a table were clustered by a nonunique value of last name.

After this lesson, you will be able to: n Deploy IPSec on a network through an IPSec policy. n Deploy IPSec on a network through Connection Security Rules. Estimated lesson time: 60 minutes

Figure 5-8

If a nonclustered index existed on a unique value, such as social security number, and a query looked into the index for a speci c social security number of 123-45-6789 and found that its clustering key was Smith, then if multiple rows with a last name of Smith existed, the question would be which one How would the speci c row with a social security number of 123-45-6789 be located ef ciently.

Part IV:

The sam ple for t his sect ion and t he nex t t wo sect ions dem onst r at ing inherit ance wit h Visual Basic .NET all use t he

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