Often when large updates are carried out against tables you may experience poor query performance in terms of response time. This requires rebuilding the indexes which can be done in either of the following two ways:
1. Create index...with drop existing
2. DBCC DBREINDEX (to rebuild all indexes)
Remember to choose the second choice since the first option does not drop primary key and unique constraints and you cannot drop and recreate indexes until you drop these constraints on the indexed columns (if any). DBCC DBREINDEX is much faster and more efficient. Do not use drop and then create index again. That's a time-consuming and inefficient approach.
Lance H. writes: "DBCC INDEXDEFRAG can be run online where dbreindex really requires offline processing time."
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This was first published in March 2002