Index rebuild on sql server - sql

Question

I am doing the index rebuilding on database.
I need to verify if it is done or not.
Can somebody please guide me.
I am using SQL Server 2008 R2

Answer 1

If you are looking for details on all indexes and tables in your database you can use.
SELECT OBJECT_NAME(object_id),*
FROM sys.dm_db_index_physical_stats(DB_ID(),NULL,NULL,NULL,'SAMPLED')
It just occurred to me that you might also be asking how to know the progress of the reindexing. For this you can use
SELECT percent_complete
from sys.dm_exec_requests
where session_id= <spid of interest>

Answer 2

A key thing would be to run the "Index Physical Statistics" report and "Disk Usage by Top Tables" reports before and after you rebuild the indexes.
On the "Index Physical Statistics" report, you can see how fragmented each index is.
To see these reports...
* Right Click on database in Sql Server Management Studio
* Mouse over "Reports", then "Standard Reports", then select the report you want.
For a script you can set up to identify fragmented indexes and rebuild them (and for more info), check this out:
http://www.foliotek.com/devblog/sql-server-optimization-with-index-rebuilding/

Answer 3

If you have successfully re-indexed your tables, then the index fragmentation will be zero (or close to if you have hot tables). You can use this script to check the fragmentation level
DECLARE
#IndexID int,
#TableID int,
#IndexName varchar(256)
--Enter index name here
SELECT #IndexName = '<index name>'
--Enter table name here
SET #TableID = OBJECT_ID('<table name>')
SELECT #IndexID = IndID
FROM sysindexes
WHERE
id = #TableID
AND name = #IndexName
DBCC SHOWCONTIG (#id, #IndexID)
What you are looking for in the output is the property called Scan Density. This should be close to 100%. If not, then your re-indexing is not complete/successful
If you have lots of tables/indices, this can get tedious, so short-circuit it by auto-generating the script like this:
SELECT 'DBCC SHOWCONTIG ' +
'('
+ CONVERT(varchar(32), si.id) + ','
+ CONVERT(varchar(32), si.indid) +
')--' + so.name
FROM sysobjects so
INNER JOIN sysindexes si
ON (so.id = si.id)
WHERE (
so.type = 'U' AND
si.indid < 2 AND
si.id = object_id(so.name)
)

Answer 4

You can try this procedure. It will rebuild the index of all the tables in the database and print the result as it progresses to the message pane of your Management Studio:
CREATE PROCEDURE [dbo].[ReIndexDatabase]
AS
DECLARE #MyTable VARCHAR(255)
DECLARE myCursor
CURSOR FOR
SELECT table_name
FROM information_schema.tables
WHERE table_type = 'base table'
OPEN myCursor
FETCH NEXT
FROM myCursor INTO #MyTable
WHILE ##FETCH_STATUS = 0 BEGIN
PRINT 'Reindexing Table: ' + #MyTable
EXEC('ALTER INDEX ALL ON '+#MyTable+'
REBUILD WITH (FILLFACTOR = 80, SORT_IN_TEMPDB = OFF,
STATISTICS_NORECOMPUTE = ON)');
FETCH NEXT FROM myCursor INTO #MyTable
END
CLOSE myCursor
DEALLOCATE myCursor
EXEC sp_updatestats
You can see this link for more on re-indexing or this link.
Note the information at the top of the page.