30Mar/100
Database Interview: Difference between Index defrag and Index rebuild?
When you create an index in the database, the index information used
by queries is stored in index pages. The sequential index pages are
chained together by pointers from one page to the next. When changes
are made to the data that affect the index, the information in the
index can become scattered in the database. Rebuilding an index
reorganizes the storage of the index data (and table data in the case
of a clustered index) to remove fragmentation. This can improve disk
performance by reducing the number of page reads required to obtain
the requested data
DBCC INDEXDEFRAG - Defragments clustered and secondary indexes of the
specified table or view.
