Rebuild Indexes

--Description : This script reorganizes and rebuilds the index if the fragmentation level is higher the given threshold 
-- You can define the threshold for reorganize as well as for rebuild and script will work accordingly 
-- INPUTS : @fillfactor - While rebuilding index what would be FILLFACTOR for new index 
-- @FragmentationThresholdForReorganizeTableLowerLimit - Fragmentation Level lower threshold to check for reorganizing the table, if the fragmentation is higher than this level, it will be considered for reorganize 
-- @@FragmentationThresholdForRebuildTableLowerLimit - Fragmentation Level lower threshold to check for rebuilding the table, if the fragmentation is higher than this level, it will be considered for rebuild 
-- NOTES : PRINT statements are all queued up and don't show up until the entire script is printed. However, there is an alternative to PRINTing messages.  
-- You can raise an error that isn't really an error (code of 0) and you'll get the same effect--message will be printed immediately. 
DECLARE @cmd NVARCHAR(1000)  
DECLARE @Table VARCHAR(255)  
DECLARE @SchemaName VARCHAR(255) 
DECLARE @IndexName VARCHAR(255) 
DECLARE @AvgFragmentationInPercent DECIMAL 
DECLARE @fillfactor INT  
DECLARE @FragmentationThresholdForReorganizeTableLowerLimit VARCHAR(10) 
DECLARE @FragmentationThresholdForRebuildTableLowerLimit VARCHAR(10) 
DECLARE @Message VARCHAR(1000) 

SET NOCOUNT ON 

--You can specify your customized value for reorganize and rebuild indexes, the default values 
--of 10 and 30 means index will be reorgnized if the fragmentation level is more than equal to 10  
--and less than 30, if the fragmentation level is more than equal to 30 then index will be rebuilt 
SET @fillfactor = 90  
SET @FragmentationThresholdForReorganizeTableLowerLimit = '10.0' -- Percent 
SET @FragmentationThresholdForRebuildTableLowerLimit = '30.0' -- Percent 

BEGIN TRY 

-- ensure the temporary table does not exist 
IF (SELECT OBJECT_ID('tempdb..#FramentedTableList')) IS NOT NULL 
DROP TABLE #FramentedTableList; 

SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Retrieving indexes with high fragmentation from ' + DB_NAME() + ' database.' 
RAISERROR(@Message, 0, 1) WITH NOWAIT 

SELECT OBJECT_NAME(IPS.OBJECT_ID) AS [TableName], avg_fragmentation_in_percent, SI.name [IndexName],  
schema_name(ST.schema_id) AS [SchemaName], 0 AS IsProcessed INTO #FramentedTableList 
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL , NULL) IPS 
JOIN sys.tables ST WITH (nolock) ON IPS.OBJECT_ID = ST.OBJECT_ID 
JOIN sys.indexes SI WITH (nolock) ON IPS.OBJECT_ID = SI.OBJECT_ID AND IPS.index_id = SI.index_id 
WHERE ST.is_ms_shipped = 0 AND SI.name IS NOT NULL 
AND avg_fragmentation_in_percent >= CONVERT(DECIMAL, @FragmentationThresholdForReorganizeTableLowerLimit)  
ORDER BY avg_fragmentation_in_percent DESC 

SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Retrieved indexes with high fragmentation from ' + DB_NAME() + ' database.' 

RAISERROR(@Message, 0, 1) WITH NOWAIT 
RAISERROR('', 0, 1) WITH NOWAIT 

WHILE EXISTS ( SELECT 1 FROM #FramentedTableList WHERE IsProcessed = 0 ) 
BEGIN 

  SELECT TOP 1 @Table = TableName, @AvgFragmentationInPercent = avg_fragmentation_in_percent,  
  @SchemaName = SchemaName, @IndexName = IndexName 
  FROM #FramentedTableList 
  WHERE IsProcessed = 0 

  --Reorganizing the index 
  IF((@AvgFragmentationInPercent >= @FragmentationThresholdForReorganizeTableLowerLimit) AND (@AvgFragmentationInPercent < @FragmentationThresholdForRebuildTableLowerLimit)) 
  BEGIN 
    SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Reorganizing Index for [' + @Table + '] which has avg_fragmentation_in_percent = ' + CONVERT(VARCHAR, @AvgFragmentationInPercent) + '.' 
    RAISERROR(@Message, 0, 1) WITH NOWAIT 
    SET @cmd = 'ALTER INDEX ' + @IndexName + ' ON [' + RTRIM(LTRIM(@SchemaName)) + '].[' + RTRIM(LTRIM(@Table)) + '] REORGANIZE'  
    EXEC (@cmd) 
    --PRINT @cmd  
    SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Reorganize Index completed successfully for [' + @Table + '].'  
    RAISERROR(@Message, 0, 1) WITH NOWAIT 
    RAISERROR('', 0, 1) WITH NOWAIT 
  END 
  --Rebuilding the index 
  ELSE IF (@AvgFragmentationInPercent >= @FragmentationThresholdForRebuildTableLowerLimit ) 
  BEGIN 
    SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Rebuilding Index for [' + @Table + '] which has avg_fragmentation_in_percent = ' + CONVERT(VARCHAR, @AvgFragmentationInPercent) + '.' 
    RAISERROR(@Message, 0, 1) WITH NOWAIT 
    SET @cmd = 'ALTER INDEX ' + @IndexName + ' ON [' + RTRIM(LTRIM(@SchemaName)) + '].[' + RTRIM(LTRIM(@Table)) + '] REBUILD WITH (FILLFACTOR = ' + CONVERT(VARCHAR(3),@fillfactor) + ', STATISTICS_NORECOMPUTE = OFF)'  
    EXEC (@cmd) 
    --PRINT @cmd 
    SET @Message = 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' - Rebuild Index completed successfully for [' + @Table + '].' 
    RAISERROR(@Message, 0, 1) WITH NOWAIT 
    RAISERROR('', 0, 1) WITH NOWAIT 
  END 

  UPDATE #FramentedTableList 
  SET IsProcessed = 1  
  WHERE TableName = @Table 
  AND IndexName = @IndexName 
END 

DROP TABLE #FramentedTableList  

END TRY 

BEGIN CATCH 
  PRINT 'DATE : ' + CONVERT(VARCHAR, GETDATE()) + ' There is some run time exception.' 
  PRINT 'ERROR CODE : ' + CONVERT(VARCHAR, ERROR_NUMBER())  
  PRINT 'ERROR MESSAGE : ' + ERROR_MESSAGE() 
END CATCH