Database re-indexing query

The following script will automatically rebuild a databases indexes to improve performance of the SQL database. You would just need to insert your database name in the field in the ‘Use’ for you to use the query to your needs.

 

Enjoy!

 

–FIND DB ID
–SELECT DB_ID()

IF OBJECT_ID(‘tempdb..#work_to_do’) IS NOT NULL
DROP TABLE tempdb..#work_to_do

BEGIN TRY
–BEGIN TRAN

use [Insert Database Name]

— Ensure a USE statement has been executed first.

SET NOCOUNT ON;

DECLARE @objectid INT;
DECLARE @indexid INT;
DECLARE @partitioncount BIGINT;
DECLARE @schemaname NVARCHAR(130);
DECLARE @objectname NVARCHAR(130);
DECLARE @indexname NVARCHAR(130);
DECLARE @partitionnum BIGINT;
DECLARE @partitions BIGINT;
DECLARE @frag FLOAT;
DECLARE @pagecount INT;
DECLARE @command NVARCHAR(4000);

DECLARE @page_count_minimum SMALLINT
SET @page_count_minimum = 20

DECLARE @fragmentation_minimum FLOAT
SET @fragmentation_minimum = 5.0

— Conditionally select tables and indexes from the sys.dm_db_index_physical_stats function
— and convert object and index IDs to names.

SELECT object_id AS objectid ,
index_id AS indexid ,
partition_number AS partitionnum ,
avg_fragmentation_in_percent AS frag ,
page_count AS page_count
INTO #work_to_do
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL,’LIMITED’)
–sys.dm_db_index_physical_stats(37, NULL, NULL, NULL,’LIMITED’)
WHERE avg_fragmentation_in_percent > @fragmentation_minimum
AND index_id > 0
AND page_count > @page_count_minimum;

IF CURSOR_STATUS(‘global’, ‘partitions’) >= -1
BEGIN
PRINT ‘partitions CURSOR DELETED’ ;
CLOSE partitions
DEALLOCATE partitions
END
— Declare the cursor for the list of partitions to be processed.
DECLARE partitions CURSOR LOCAL
FOR
SELECT *
FROM #work_to_do;

— Open the cursor.
OPEN partitions;

— Loop through the partitions.
WHILE ( 1 = 1 )
BEGIN;
FETCH NEXT
FROM partitions
INTO @objectid, @indexid, @partitionnum, @frag, @pagecount;

IF @@FETCH_STATUS < 0
BREAK;

SELECT @objectname = QUOTENAME(o.name) ,
@schemaname = QUOTENAME(s.name)
FROM sys.objects AS o
JOIN sys.schemas AS s ON s.schema_id = o.schema_id
WHERE o.object_id = @objectid;

SELECT @indexname = QUOTENAME(name)
FROM sys.indexes
WHERE object_id = @objectid
AND index_id = @indexid;

SELECT @partitioncount = COUNT(*)
FROM sys.partitions
WHERE object_id = @objectid
AND index_id = @indexid;

SET @command = N’ALTER INDEX ‘ + @indexname + N’ ON ‘
+ @schemaname + N’.’ + @objectname + N’ REBUILD’;

IF @partitioncount > 1
SET @command = @command + N’ PARTITION=’
+ CAST(@partitionnum AS NVARCHAR(10));

EXEC (@command);
–print (@command); //uncomment for testing

PRINT N’Rebuilding index ‘ + @indexname + ‘ on table ‘
+ @objectname;
PRINT N’ Fragmentation: ‘ + CAST(@frag AS VARCHAR(15));
PRINT N’ Page Count: ‘ + CAST(@pagecount AS VARCHAR(15));
PRINT N’ ‘;
END;

— Close and deallocate the cursor.
CLOSE partitions;
DEALLOCATE partitions;

— Drop the temporary table.
DROP TABLE #work_to_do;
–COMMIT TRAN

END TRY
BEGIN CATCH
–ROLLBACK TRAN
PRINT ‘ERROR ENCOUNTERED:’ + ERROR_MESSAGE()
END CATCH