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Replication Roles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

The next section, Investigate Performance Problems, lists some additional performance counters that can be helpful for investigating specific problems with your server. Exam Tip To understand how System Monitor works, you can download a free tool from MSDN called the Performance Monitor Wizard. This tool will help you select configuration settings and determine which counters are best. The utility is available at http://www.microsoft.com/downloads /details.aspx FamilyID=31fccd98-c3a1-4644-9622-faa046d69214&displaylang=en&Hash=7YTJ6NC.

Replication Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387

Replication Agents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389

Defragment an index. Rebuild an index. Specify a fill factor. Know when to enable the pad index option. Use clustered and nonclustered indexes. Use covering indexes. Use indexed views. Use included columns and composite indexes. Use XML indexes. Use partitioned indexes.

8

Agent Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390

A dynamic management view (DMV) can be included in a SELECT query to return information about the health of your server and databases. New to SQL Server 2005, DMVs expose statistical information as a result set. The information included in each view can be critical to diagnosing problems with your SQL Server.

Replication Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390

Data Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393

The SQL Server 2005 database engine automatically maintains indexes whenever INSERT, UPDATE, or DELETE operations occur. Over time, these modifications can cause the information in the index to become fragmented. Fragmentation occurs when indexes have pages in which the logical order based on the key value does not match the physical order inside the data file. Heavily fragmented indexes can degrade query performance and cause applications to respond slowly. You can remedy index fragmentation by either reorganizing or rebuilding an index. The first step in deciding which method to use to defragment an index is to determine the degree of fragmentation. You can use the system function sys.dm_db_index_physical_stats to detect fragmentation in a specific index, in all indexes on a table or in an indexed view, in all indexes in a database, or in all indexes in all databases. The percentage of logical fragmentation is displayed in the avg_fragmentation_in_percent column. For example, if you were writing a stored procedure to check the indexes in a database for fragmentation, you would use the following Transact-SQL statement:

You will need the SELECT permission for each object, along with the VIEW SERVER STATE or VIEW DATABASE STATE permission to use a DMV in a SELECT query. Which permission is required depends on whether the DMV is server-scoped or database-scoped.