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Paul has 18 years experience with Microsoft SQL Server. He has worked in the roles of production DBA, database developer, database architect, applications developer, business intelligence and data warehouse developer, and instructor for students aspiring for MCDBA certification. He has performed numerous data migrations and supported large databases (3 Terabyte, 1+ billion rows) with high transactions. He is a member of PASS, blogs about lessons learned from a developer’s approach to SQL Server administration, and has been the president of the Boulder SQL Server Users’ Group from January 2009 to present.

Sunday, March 3, 2013

CreateVwIndexPhysicalStats

This view shows most of the information necessary for determining if you should REBUILD (formerly DBCC Reindex) or REORGANIZE (formerly DBCC IndexDefrag) your indexes.  This view is a dependency of vwIndexPhysicalStatsTableSize. 

As always, the database-centric views presented in this blog are written to UNION all the databases in the instance, allowing you to do maintenance on the whole server instance rather than on one database at a time.

USE Admin

IF Object_ID('dbo.CreateVwIndexPhysicalStats') Is Not Null
      DROP PROC dbo.CreateVwIndexPhysicalStats
go

CREATE PROC dbo.CreateVwIndexPhysicalStats
      @Mode varchar(20) = 'Limited',
      @ShowSql bit = 0,
      @ShowSysObjects bit = 0
AS
/*    DATE        AUTHOR            REMARKS
      3/3/13            PPaiva            Intial creation.
     

      DESCRIPTION
            Creates a view in the Admin database to see
                  fragmentation stats for all objects in all databases
                  on this server.
            System objects are excluded by default;
                  use @ShowSysObjects = 1 to show them.
            Coded to use Convert(varchar, ServerProperty('ServerName'))
                  rather than @@ServerName since the latter can be erroneous.

      USAGE
            Exec Admin..CreateVwIndexPhysicalStats
            Exec Admin..CreateVwIndexPhysicalStats 'Limited'
            Exec Admin..CreateVwIndexPhysicalStats 'Limited', 1
            Exec Admin..CreateVwIndexPhysicalStats 'Limited', 1, 1
           
            Exec Admin..CreateVwIndexPhysicalStats 'Sampled'
            Exec Admin..CreateVwIndexPhysicalStats 'Sampled', 1
            Exec Admin..CreateVwIndexPhysicalStats 'Sampled', 1, 1
           
            Exec Admin..CreateVwIndexPhysicalStats 'Detailed'
            Exec Admin..CreateVwIndexPhysicalStats 'Detailed', 1
            Exec Admin..CreateVwIndexPhysicalStats 'Detailed', 1, 1
           

      DEBUG
            SELECT *
            FROM vwIndexPhysicalStats
            WHERE DB = 'Admin'           
            ORDER BY 1, 2, 3, 4

            -- Cannot rebuild
            SELECT *
            FROM vwIndexPhysicalStats
            WHERE DB = 'Admin'           
              AND (AllowPgLocks = 0 OR IsDisabled = 1)
            ORDER BY 1, 2, 3, 4


            SELECT *
            FROM sys.databases

*/
SET NOCOUNT ON

DECLARE @s varchar(max),
            @DB varchar(100),
            @MaxDB varchar(100),
            @i int,
            @sNow varchar(16)

SET @sNow = Convert(varchar(16), GetDate(), 120)


SET @s = 'IF Object_ID(''dbo.vwIndexPhysicalStats'') Is Not Null
      DROP VIEW dbo.vwIndexPhysicalStats'

IF @ShowSql = 1
      Print @s

Exec(@s)
     
Print ''

SET @s = 'CREATE VIEW vwIndexPhysicalStats
AS
/*    DATE        AUTHOR            REMARKS
      ' + Convert(varchar(10), GetDate(), 01) + '     PPaiva            Initial creation.

      DESCRIPTION
            Provides a list of physical stats of all indexes in all databases
                  on this instance.
            This view is auto-generated via executing
                  Admin.dbo.CreateVwIndexPhysicalStats. 
            If a new database is added this view won''t show it unless
                  you run the refresh code below. 
            If a database is deleted this view will malfunction unless
                  you run the refresh code below. 
                 
      To REFRESH VIEW when new databases are added:
            Exec Admin.dbo.CreateVwIndexPhysicalStats
           

      -- Sample of view      
      SELECT TOP 100 *
      FROM Admin.dbo.vwIndexPhysicalStats
      ORDER BY PercFrag desc


*/
'

-- Will refer to these system databases more than once,
-- so load into table for easy reference.
CREATE TABLE #SysDB(
      Name varchar(30) NOT NULL
      )
INSERT INTO #SysDB VALUES ('master')
INSERT INTO #SysDB VALUES ('tempdb')
INSERT INTO #SysDB VALUES ('model')
INSERT INTO #SysDB VALUES ('msdb')
INSERT INTO #SysDB VALUES ('Admin')
INSERT INTO #SysDB VALUES ('distribution')


SELECT name
INTO #DBs
FROM sys.databases
WHERE state_desc = 'online'

IF @ShowSysObjects = 0
      DELETE #DBs
      FROM #DBs d
      JOIN #SysDB s
            ON s.Name = d.name

SELECT  @MaxDB = Max(Name),
            @DB = '',
            @i = 0
FROM #DBs


DECLARE @IsSystemDB char(1)

WHILE @DB < @MaxDB
      BEGIN
            SET @i = @i + 1

            SELECT @DB = Min(Name)
            FROM #DBs
            WHERE Name > @DB
           
            IF @DB In (SELECT Name FROM #SysDB)
                  SET @IsSystemDB = '1'
            ELSE
                  SET @IsSystemDB = '0'


            SET @s = @s + '
SELECT  '

            SET @s = @s + 'Convert(varchar, ServerProperty(''ServerName'')) as Server,
            ''' + @DB + ''' as DB,
            s.name COLLATE SQL_Latin1_General_CP1_CI_AS SchemaName,
            o.Name COLLATE SQL_Latin1_General_CP1_CI_AS ObjName,
            i.name COLLATE SQL_Latin1_General_CP1_CI_AS IndexName,
            Convert(numeric(5,1), dmv.avg_fragmentation_in_percent) AS PercFrag,
            dmv.fragment_count AS TotalFrags,
            Convert(numeric(5,1), dmv.avg_fragment_size_in_pages) AS PagesPerFrag,
            dmv.page_count AS NumPages,        
            dmv.partition_number PartNum,
            dmv.index_type_desc IndexType,
            dmv.alloc_unit_type_desc AllocDesc,
            i.is_unique IsUniq,
            i.is_primary_key IsPK,
            i.is_unique_constraint IsUniqCon,
            dmv.index_depth IndexDepth,
            dmv.index_level IndexLevel,
            i.is_disabled IsDisabled,
            i.allow_page_locks AllowPgLocks,
            i.allow_row_locks AllowRowLocks,
            dmv.object_id,
            dmv.database_id,
            ''' + @sNow + ''' ViewCreateDate
FROM sys.dm_db_index_physical_stats(db_id(''' + @DB + '''), Null, Null, Null, ''' + @Mode + ''') dmv
JOIN [' + @DB + '].sys.indexes i
      ON  i.object_id = dmv.object_id
      AND i.index_id = dmv.index_id
JOIN [' + @DB + '].sys.objects o
      ON o.object_id = dmv.object_id
JOIN [' + @DB + '].sys.schemas s
      ON s.schema_id = o.schema_id
'

                                   
            IF @DB <> @MaxDB
                  SET @s = @s + '    UNION ALL '
                 

      END



IF @ShowSql = 1
      BEGIN
            Print @s
      END

Exec (@s)



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