Question 21

Answer C is correct. To correct fragmentation of indexes, you need to reorganize the indexes. You could rebuild the indexes to correct fragmentation issues, but you would need to take the data offline. Defragmenting the disk does not correct fragmentation within the data and log files. DBCC CLEANTABLE is used to reclaim space dropped from variable-length and text columns. DBCC CHECKIDENT checks the current identity value for a table.

For more information, see the following sources:

• Chapter 8, "Troubleshooting and Optimizing SQL Server"

• SQL Server 2005 Books Online: "SQL Server Database Engine, Designing and Creating Databases, Indexes, Optimizing Indexes, Performing Index Operations Online"

• "ALTER DATABASE," http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_aa-az_4e5h.asp