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SQL Server FAQ - DROP_EXISTING - Recreating an Existing Index

By: FYIcenter.com

(Continued from previous topic...)

How To Recreate an Existing Index?

If you want to change the definition of an existing index, you can use the "DROP INDEX" statement to drop the index first. Then use the "CREATE INDEX" statement to create it again with the new definition.

But you can also combine those two statements into one:

CREATE INDEX ... WITH (DROP_EXISTING = ON)

The tutorial exercise below recreates fyi_links_url with a change to index columns:

USE FyiCenterData;
GO

CREATE INDEX fyi_links_url ON fyi_links_indexed (url, counts)
   WITH (DROP_EXISTING = ON);
GO

SP_HELP fyi_links_indexed;
GO
index_name        index_description                index_keys 
---------------- -------------------------------- ------------
fyi_links_counts  nonclustered located on PRIMARY  counts
fyi_links_url     nonclustered located on PRIMARY  url, counts

  1. What Are Indexes?
  2. How To Create an Index on an Existing Table?
  3. How To View Existing Indexes on an Given Table using SP_HELP?
  4. How To View Existing Indexes on an Given Table using sys.indexes?
  5. How To Drop Existing Indexes?
  6. Is the PRIMARY KEY Column of a Table an Index?
  7. Does the UNIQUE Constraint Create an Index?
  8. What Is the Difference Between Clustered and Non-Clustered Indexes?
  9. How To Create a Clustered Index?
  10. How To Create an Index for Multiple Columns?
  11. How To Create a Large Table with Random Data for Index Testing?
  12. How To Measure Performance of INSERT Statements?
  13. Does Index Slows Down INSERT Statements?
  14. Does Index Speed Up SELECT Statements?
  15. What Happens If You Add a New Index to Large Table?
  16. What Is the Impact on Other User Sessions When Creating Indexes?
  17. What Is Index Fragmentation?
  18. What Causes Index Fragmentation?
  19. How To Defragment Table Indexes?
  20. How To Defragment Indexes with ALTER INDEX ... REORGANIZE?
  21. How To Rebuild Indexes with ALTER INDEX ... REBUILD?
  22. How To Rebuild All Indexes on a Single Table?
  23. How To Recreate an Existing Index?

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