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/************************************************************************************************
Index Fragmentation
By Wesley D. Brown
Date 06/27/2011

**Description**
Uses Index DMV's to track index fragmentation over time.
Functions:
**End Discription**
**Change Log**
Bug Fix:
**End Change Log**
************************************************************************************************/
/************************************************************************************************
DROP TABLE dbo.IndexFragmentationLevels
DROP TABLE dbo.IndexFragmentationLevelsHistory
************************************************************************************************/
IF NOT EXISTS (SELECT *
               FROM dbo.sysobjects
               WHERE id = Object_id(N'[dbo].[IndexFragmentationLevels]')
                      AND Objectproperty(id, N'IsUserTable') = 1)
  BEGIN
CREATE TABLE dbo.IndexFragmentationLevels
(
ServerName NVARCHAR(128),
DBName NVARCHAR(128),
PartitionNumber SMALLINT,
SchemaName NVARCHAR(128),
TableName NVARCHAR(128),
IndexName NVARCHAR(128),
Fragmentation FLOAT,
PageTotalCount INT,
RangeScanCount BIGINT,
RecordedDateTime DATETIME
);
    END
ELSE
  BEGIN
      PRINT 'Table IndexUsageStatistics already exists'
  END


IF NOT EXISTS (SELECT *
               FROM dbo.sysobjects
               WHERE id = Object_id(N'[dbo].[IndexFragmentationLevelsHistory]')
                      AND Objectproperty(id, N'IsUserTable') = 1)
BEGIN
CREATE TABLE dbo.IndexFragmentationLevelsHistory
(
ServerName NVARCHAR(128),
DBName NVARCHAR(128),
PartitionNumber SMALLINT,
SchemaName NVARCHAR(128),
TableName NVARCHAR(128),
IndexName NVARCHAR(128),
Fragmentation FLOAT,
PageTotalCount INT,
RangeScanCount BIGINT,
RecordedDateTime DATETIME
);
END
ELSE
BEGIN
PRINT 'Table IndexUsageStatistics already exists'
END


IF EXISTS (
  SELECT 1
    FROM INFORMATION_SCHEMA.ROUTINES
   WHERE SPECIFIC_NAME = N'GatherIndexFragmentationLevels'
)
DROP PROCEDURE GatherIndexFragmentationLevels
GO

/*
exec GatherIndexFragmentationLevels 'ALL',1
select * from IndexFragmentationLevels
*/
CREATE PROCEDURE GatherIndexFragmentationLevels
@DatabaseList VARCHAR(MAX),
@ExcludeSystemDatabases tinyint = 1,
@ScanType VARCHAR(10) = 'LIMITED',
@MinimumPageCount INT = 8,
@NumberOfThreads TINYINT = 4

AS
  SET NOCOUNT ON
  /************************************************************************************************
@ScanType sys.dm_db_index_physical_stats takes a parameter to determine how
aggresively to scan the index and determine fragmentation levels.
LIMITED - only scans parent level of the b-tree quickest and least
impacting
SAMPLED - takes a one percent sample of all data pages.
DETAILED - scans all data pages. This can kill your disk system
with heavy IO loads. use with much care!

@minPageCount default 8 generally, trying to defrag an index that is smaller than
an extent is pointless
************************************************************************************************/
/*****************************************
* Truncate holding tables
*****************************************/
  IF EXISTS (SELECT 1
             FROM dbo.IndexFragmentationLevels)
    BEGIN
        INSERT INTO dbo.IndexFragmentationLevelsHistory
        SELECT *
        FROM IndexFragmentationLevels;

        TRUNCATE TABLE dbo.IndexFragmentationLevels;
    END

    /* Declare Parameters */
DECLARE
  @tablename VARCHAR(4000) = NULL,
  @cmd VARCHAR(8000),
  @servername VARCHAR(256),
  @dbname VARCHAR(256),
  @schemaname NVARCHAR(128),
  @recordeddatetime DATETIME
        

CREATE TABLE #dbnames
(
name NVARCHAR(128)
)

  SET @recordeddatetime = GETDATE()
  SET @servername = CAST(Serverproperty('servername') AS VARCHAR(256))

    IF Upper(@DatabaseList) = 'ALL'
    BEGIN
        IF @ExcludeSystemDatabases = 1
          BEGIN
              SET @DatabaseList = '';

              SELECT @DatabaseList = @DatabaseList + '''' + name + ''','
              FROM MASTER.dbo.sysdatabases
              WHERE name NOT IN ( 'master', 'msdb', 'model', 'pubs',
                                   'northwind', 'tempdb' );
          END
        ELSE
          BEGIN
              SELECT @DatabaseList = @DatabaseList + '''' + name + ''','
              FROM MASTER.dbo.sysdatabases;
          END

        SET @DatabaseList = LEFT(@DatabaseList, Len(@DatabaseList) - 2) + ''''
        
INSERT INTO #dbnames
EXEC('select name from master.dbo.sysdatabases where name in ('+@DatabaseList+')')

    END
    --found at http://mangalpardeshi.blogspot.com/2009/03/how-to-split-comma-delimited-string.html
;WITH Cte AS
(
select CAST('<M>' + REPLACE( @DatabaseList, ',' , '</M><M>') + '</M>' AS XML) AS DatabaseNames
)

insert into #dbnames
SELECT
Split.a.value('.', 'VARCHAR(100)') AS DatabaseNames
FROM Cte
CROSS APPLY DatabaseNames.nodes('/M') Split(a)

    IF not exists(select 1 from #dbnames)
    BEGIN
insert into #dbnames select @DatabaseList
    END

  DECLARE db CURSOR FAST_FORWARD FOR
    SELECT name
    FROM #dbnames

  OPEN db

  FETCH NEXT FROM db INTO @dbname

  WHILE ( @@FETCH_STATUS <> -1 )
    BEGIN
        IF ( @@FETCH_STATUS <> -2 )
          BEGIN
              IF (SELECT CONVERT(SYSNAME, Databasepropertyex(@dbname, 'status'))
                 )
                 =
                 'ONLINE'
                BEGIN
set @cmd = '
INSERT INTO dbo.IndexFragmentationLevels
SELECT
'''+@servername+''' AS ''ServerName''
,'''+@dbname+''' AS ''DatabaseName''
, ps.partition_number AS ''PartitionNumber''
, Object_schema_name(ps.object_id,DB_ID('''+@dbname+'''))
, OBJECT_NAME(ps.object_id,db_id('''+@dbname+'''))
, si.name
, SUM(ps.avg_fragmentation_in_percent) AS ''Fragmentation''
, SUM(ps.page_count) AS ''PageTotalCount''
, os.range_scan_count
, '''+convert(varchar,@recordeddatetime, 121)+'''
FROM sys.dm_db_index_physical_stats(DB_ID('''+@dbname+'''),NULL, NULL , NULL, '''+@ScanType+''') AS ps
INNER JOIN sys.dm_db_index_operational_stats(DB_ID('''+@dbname+'''), NULL, NULL , NULL) AS os
ON ps.database_id = os.database_id
AND ps.[object_id] = os.[object_id]
AND ps.index_id = os.index_id
AND ps.partition_number = os.partition_number
INNER JOIN ['+@dbname+'].sys.indexes si
on
ps.object_id = si.object_id
and
ps.index_id = si.index_id
WHERE
ps.index_id > 0
AND ps.page_count > '+cast(@MinimumPageCount as varchar(10))+'
AND ps.index_level = 0
GROUP BY ps.database_id
, DB_NAME(ps.database_id)
, ps.[object_id]
, ps.index_id
, ps.partition_number
, os.range_scan_count
, si.name
OPTION (MAXDOP '+cast(@NumberOfThreads as varchar(3))+');'
exec(@cmd)
END
END
FETCH NEXT FROM db INTO @dbname
END

CLOSE db
DEALLOCATE db

DROP TABLE #dbnames
SET nocount OFF
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