Defrag Or Not To Defrag

Mar 14, 2007

I have been reading many things on the internet and I wanted to create a thread asking my question here. We currently do all the re-indexing and show contig's etc to maintain my sql data and to ensure everything is good to go there.

My question is, what about the physical drive and data. We house our mdf's on a raid 1_0 and our ldfs on raid 5. I am wondering if I need to defrag these drives b/c if not am i impacting my I/O on that box. If so should I stop the sql service so that it does not corrupt SQL data? Any help on this topic would be great.



-patrick

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How To Defrag A Table?

Jul 30, 2004

I have a large table with no PK but has other indexes. How to defrag the table (not the indexes)? Do I need to drop and re-create the table or something?

Thanks.

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Defrag SQL SERVER

Feb 13, 2004

Folks

Our sql server machine is badly in need of a defrag however I'm a bit weary of doing this as I'm really not sure of the implications or indeed how to do it.

I'm really not a server type of person so any assistance would be gratefully received. If anyone can explain it to me like I'm a 5 year old then that would probably be best!



Cheers

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Database Defrag

Jul 14, 2004

Hello,
I am working with a very large db (850+gig) that is in desperate need of defragging. I am familiar with DBCC Reindex and DBCC IndexDefrag but am concerned that these processes will take an extremely long time to run. Has anyone had any experience with any 3rd party tools that better/faster then DBCC? Or any ideas or suggestions how best to attack this? Among the many tables with large footprints and millions of rows, I have 3 tables with reserved space over 100g also 3 tables with over 500Mil rows (1 tbl with > 1bil rows). This is a 24x7 db.

Thanks in advance for any ideas and suggestions
Jeff

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Apr 17, 2006

Hi

Can I de-frag the Drive in which the Data files & Log Files of the SQl Server Exists ???

Please Advice.


Thanks

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Jul 19, 2007

Isn't there any way to automate Windows defrag? Isn't there any undocumented parameters for DEFRAG.EXE?

Canada DBA

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Oct 21, 2007

I#ve been doing disaster recovery on a web box that died today.

So I thought I'd do some "downtime" maintenance on the DB server

I ran a BDREINDEX on all tables, all indexes. (I know this is the 2000 way, but I assume its as good as the proper 2005 way??).

5 minutes on a 10GB database. Not bad!

I checked the DEFRAG and UPDATE STATS processes that run overnight.

They are basically defragging only tables with SHOWCONTIG indicating fragmentation. And then doing an UPDATE STATISTICS WITH FULLSCAN on all tables

That is taking an average of 30 minutes ...

Is DBREINDEX the equivalent of an UPDATE STATISTICS WITH FULLSCAN, or is it in some way a smaller-sample version?

I'm wondering why I don't just lock the DB and do a REINDEX of everything in 5 minutes ...

Kristen

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Dec 5, 2007

I am new to sql server and we have sql server 2000

DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PS_ORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PS0ORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PSAORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PSBORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PSCORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PSEORD_LINE )
DBCC INDEXDEFRAG ( 0, PS_ORD_LINE, PSFORD_LINE )

Please somebody give me for sql server 2005 scripts for above.

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May 26, 1999

I'd like to build a process that will identify all the tables in a database with a scan density less than 100% and generate 'dbcc dbreindex' statements for them. The 'dbcc showcontig' command displays the information I want but I don't know how to access this information from within a script. Any ideas out there?

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Jul 7, 2004

How do we defrag indexed views? Can any one give me a query to loop thru all the indexed views in the database and find out the fragmentation levels and also defrag them?
Thanks in advance!

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Does Index Defrag Get Logged?

Sep 15, 2006

I've noticed a huge transaction log size after having run an
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log really? (Assuming the full recovery model.)

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How To Defrag SQL Server 2000

Nov 15, 2006

Hi everyone, I am fairly new with SQL Server and need a little bit of help in regards to boosting my SQL servers performance. I have been advised that defraging SQL Server will definitely help solve my issue however I have never performed this function before. Can someone please help guide me through the necessary steps to execute this task. Thanks in advance.

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Aug 22, 2007

Is there any easy way to defrag a table with no clustered idx other than bcp out then back in ? (SQL 2000)Actually I have a 100GB db that I deleted data from other tables, about 10GB worth, but access to the table in question (38GB) seems to have slowed down dramatically, Or does the entire disk need to be defragmented and a bcp out/in would be a waste of time on this table ?I run an index defrag every night, reindex weekly.Thanks.

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YADS -- Yet Another Defrag Script

Oct 2, 2007

This script was based on the original posted here: http://sql-server-performance.com/Community/forums/p/20584/114940.aspx#114940

I use the REORGANIZE option of ALTER INDEX. It's default is ONLINE, no matter what the engine edition and makes for simpler code.

I also make heavy use of my own logging tables, which are included at the bottom of the sp.

Please, feel free to comment. I like getting feedback about my scripts and it seems rarely that happens...


USE Admin
GO

IF EXISTS (SELECT [name] FROM Admin.sys.objects WHERE [name] = 'usp_DB_DeFrag' AND TYPE = 'P')
DROP PROCEDURE dbo.usp_DB_DeFrag
GO

CREATE PROCEDURE dbo.usp_DB_DeFrag (@DBName sysname, @Percentage float = 10)
-- EXEC Admin.dbo.usp_DB_Defrag @DBName = 'FooDB', @Percentage = 10
AS

/******************************************************************************
**Name: Admin.dbo.usp_DB_DeFrag.sql
**
**Description: Defragment indexes using REORGANIZE for online operation.
**Record historical fragmentation information to a permanant table
**for trend/history analysis.
**
**Depends on: SQL2005 >= SP2 due to object_name() usage. See BOL for details.
**Admin.dbo.Process_Log - Table
**Admin.dbo.FragTracking - Table
**
** TODO: Open to suggestions...
**
**Author: G. Rayburn <grayburn@---.com>
**
**Date: 10/02/2007
**
*******************************************************************************
**Modification History
*******************************************************************************
**
**Initial Creation: 10/02/2007 G. Rayburn <grayburn@---.com>
**
*******************************************************************************
**
******************************************************************************/
SET NOCOUNT ON;

DECLARE @DynFragList varchar(1024)
, @DynDBAlter varchar(256)
, @DynDefragDriver varchar(max)
, @DynUpdateStats varchar(1024)
, @OrigRecoveryModel nvarchar(128)
, @Process_Name varchar(150)
, @Message varchar(256)
, @Error int

-- Cursor objects:
, @SchemaName sysname
, @ObjectName sysname
, @IndexName sysname
, @IndexType nvarchar(60)
, @AvgFrag int
, @PageCount int
, @RecordCount int
--, @GhostRecordCnt bigint
--, @Partition int
;


-- DEBUG:
--SET @DBName = 'FooDB'
--SET @Percentage = 10;


SET @Process_Name = 'usp_DB_Defrag run on [' + @DBName + ']';


-- Ensure that @DBName is a valid db for db_id() usage.
IF (db_id(@DBName)) IS NULL
BEGIN
SET @Message = '[' + @DBName + '] is not a valid database on ' + @@SERVERNAME + ', please check your spelling and try again.'

INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'ERROR', 9999, @Message)

RETURN
END;


-- Record startup message:
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'INFO', 0, '[START] - usp_DB_Defrag @DBName = [' + @DBName + '], @Percent = ' + CONVERT(varchar(3),@Percentage) + '.')


-- Check & alter recovery model if neccessary:
SET @OrigRecoveryModel = (SELECT CONVERT(varchar(55),DATABASEPROPERTYEX(@DBName, 'Recovery')))

IF @OrigRecoveryModel = 'FULL'
BEGIN
SET @DynDBAlter = 'ALTER DATABASE [' + @DBName + ']
SET RECOVERY BULK_LOGGED';

EXEC (@DynDBAlter);

SET @Error = (SELECT @@ERROR)
IF @Error = 0
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'SUCCESS', CONVERT(varchar(15),@Error), 'Successfully set database [' + @DBName + '] to BULK_LOGGED recovery model.')
END;
ELSE
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'ERROR', CONVERT(varchar(15),@Error), 'Failed to set database [' + @DBName + '] to BULK_LOGGED recovery model.')
END;
END;
ELSE
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'INFO', 0, 'Database [' + @DBName + '] is in ' + @OrigRecoveryModel + ' recovery model so no need to change it.')
END;



-- Temp table of initial DBCC results:
CREATE TABLE #_FragList
(
ObjectName varchar(100)
, [Object_ID] int
, Index_ID int
, Partition_Number int
, IndexType varchar(60)
, alloc_unit_type_desc nvarchar(60)
, avg_fragmentation_in_percent float
, avg_fragment_size_in_pages float
, avg_page_space_used_in_percent float
, fragment_count bigint
, page_count bigint
, record_count bigint
, forwarded_record_count bigint
, ghost_record_count bigint
);

INSERT INTO #_FragList

SELECT
LEFT(object_name([object_id], db_id(@DBName)),100)
, [object_id]
, index_id
, partition_number
, index_type_desc
, alloc_unit_type_desc
, avg_fragmentation_in_percent
, avg_fragment_size_in_pages
, avg_page_space_used_in_percent
, fragment_count
, page_count
, record_count
, forwarded_record_count
, ghost_record_count

FROM sys.dm_db_index_physical_stats (db_id(@DBName), NULL, NULL, NULL, 'DETAILED')

WHERE avg_fragmentation_in_percent >= @Percentage
AND index_id >= 1
AND page_count >= 1000

ORDER BY -- Ensure Clustered indexes are rebuilt first.
[object_id]
, index_id ASC;

CREATE INDEX IDX_ObjNameIndexID ON #_FragList (ObjectName, Index_id);


-- Historical tracking:
INSERT INTO Admin.dbo.FragTracking

SELECT @DBName
, ObjectName
, [Object_ID]
, Index_ID
, Partition_Number
, IndexType
, alloc_unit_type_desc
, avg_fragmentation_in_percent
, avg_fragment_size_in_pages
, avg_page_space_used_in_percent
, fragment_count
, page_count
, record_count
, forwarded_record_count
, ghost_record_count
, getdate()

FROM #_FragList

ORDER BY [Object_ID]
, Index_ID ASC;


-- Create & populate Temp table to drive defrag operations from.
CREATE TABLE #_DefragDriver
(
IdentID int IDENTITY(1,1)
, SchemaName sysname
, ObjectName sysname
, IndexName sysname
, IndexType varchar(60)
, avg_fragmentation_in_percent float
, page_count int
, record_count int
, ghost_record_count bigint
, partition_number int
);


SET @DynDefragDriver = '
USE [' + @DBName + ']

INSERT INTO #_DefragDriver

SELECT schema_name(so.schema_id)
, fl.[ObjectName]
, si.[name]
, fl.IndexType
, fl.avg_fragmentation_in_percent
, fl.page_count
, fl.record_count
, fl.ghost_record_count
, fl.partition_number

FROM #_FragList fl
, [' + @DBName + '].sys.indexes si
, [' + @DBName + '].sys.objects so

WHERE object_id(fl.ObjectName) = si.object_id
AND fl.index_id = si.index_id
AND object_id(fl.objectname) = so.object_id
AND si.is_disabled = 0
AND si.allow_page_locks = 1

GROUP BY so.schema_id
, fl.[ObjectName]
, fl.[object_id]
, fl.index_id
, si.[name]
, fl.IndexType
, fl.avg_fragmentation_in_percent
, fl.page_count
, fl.record_count
, fl.ghost_record_count
, fl.partition_number

ORDER BY fl.[object_id]
, fl.index_id ASC; '

EXEC (@DynDefragDriver);



-- Do the defrag.
DECLARE curDBFrag CURSOR
FOR

SELECT SchemaName
, ObjectName
, IndexName
, IndexType
, avg_fragmentation_in_percent
, page_count
, record_count
--, ghost_record_count
--, partition_number

FROM #_DefragDriver

ORDER BY IdentID ASC;

OPEN curDBFrag

FETCH NEXT FROM curDBFrag INTO @SchemaName, @ObjectName, @IndexName, @IndexType, @AvgFrag, @PageCount, @RecordCount --, @GhostRecordCnt, @Partition
WHILE (@@fetch_status <> -1)
BEGIN
IF (@@fetch_status <> -2)
BEGIN

-- ALTER INDEX operations:
SET @Message = 'Table: [' + @ObjectName + '] with record count: ' + CONVERT(varchar(15),@RecordCount) + ' and page count: ' + CONVERT(varchar(15),@PageCount) + '. Index: [' + @IndexName + '] of type: ' + @IndexType + ' is ' + CONVERT(varchar(5),@AvgFrag) + '% fragmented.';

SET @DynFragList = 'ALTER INDEX [' + @IndexName + '] ON [' + @DBName + '].[' + @SchemaName + '].[' + @ObjectName + '] REORGANIZE;'

EXEC (@DynFragList);

SET @Error = (SELECT @@ERROR)
IF @Error = 0
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'SUCCESS', CONVERT(varchar(15),@Error), @Message)
END;
ELSE
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'ERROR', CONVERT(varchar(15),@Error), @Message)
END;


-- UPDATE STATISTICS operations:
SET @Message = 'UPDATE STATISTICS [' + @SchemaName + '].[' + @ObjectName + '] [' + @Indexname + '];'

SET @DynUpdateStats = '
USE [' + @DBName + ']

UPDATE STATISTICS [' + @SchemaName + '].[' + @ObjectName + '] [' + @Indexname + ']; '

EXEC (@DynUpdateStats);

SET @Error = (SELECT @@ERROR)
IF @Error = 0
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'SUCCESS', CONVERT(varchar(15),@Error), @Message)
END;
ELSE
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'ERROR', CONVERT(varchar(15),@Error), @Message)
END;


-- Friendly WAITFOR operation:
WAITFOR DELAY '00:00:05.000'

END;
FETCH NEXT FROM curDBFrag INTO @SchemaName, @ObjectName, @IndexName, @IndexType, @AvgFrag, @PageCount, @RecordCount --, @GhostRecordCnt, @Partition
END;

CLOSE curDBFrag
DEALLOCATE curDBFrag;


-- Reset FULL recovery model.
IF @OrigRecoveryModel = 'FULL'
BEGIN
SET @DynDBAlter = 'ALTER DATABASE [' + @DBName + ']
SET RECOVERY FULL';

EXEC (@DynDBAlter);

SET @Error = (SELECT @@ERROR)
IF @Error = 0
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'SUCCESS', CONVERT(varchar(15),@Error), 'Successfully reset database [' + @DBName + '] back to FULL recovery model.')
END;
ELSE
BEGIN
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'ERROR', CONVERT(varchar(15),@Error), 'Failed to reset database [' + @DBName + '] back to FULL recovery model.')
END;
END;


-- Record complete message:
INSERT INTO Admin.dbo.Process_Log
VALUES (getdate(), @Process_Name, 'INFO', 0, '[COMPLETE] - usp_DB_Defrag @DBName = [' + @DBName + '], @Percent = ' + CONVERT(varchar(3),@Percentage) + '.');


-- Cleanup:
DROP TABLE #_FragList;
DROP TABLE #_DefragDriver;


-- Dependancies:
----
----USE [Admin]
----GO
---- DROP TABLE Admin.dbo.FragTracking
----CREATE TABLE FragTracking
----( TrackID int IDENTITY(1,1) -- PRIMARY KEY CLUSTERED
----, DBName sysname
----, ObjectName sysname
----, Object_ID int
----, Index_ID int
----, Partition_Number int
----, IndexType varchar(60)
----, alloc_unit_type_desc nvarchar(60)
----, avg_fragmentation_in_percent float
----, avg_fragment_size_in_pages float
----, avg_page_space_used_in_percent float
----, fragment_count bigint
----, page_count bigint
----, record_count bigint
----, forwarded_record_count bigint
----, ghost_record_count bigint
----, SnapDate datetime
----);
----
----USE [Admin]
----GO
---- DROP TABLE Admin.dbo.Process_Log
----CREATE TABLE [dbo].[Process_Log](
----[MessageID] [int] IDENTITY(1,1) NOT NULL,
----[Date] [datetime] NOT NULL,
----[Process_Name] [varchar](150) NULL,
----[Severity] [varchar](15) NULL,
----[ErrorCode] [int] NULL,
----[Message] [varchar](255) NULL,
---- CONSTRAINT [PK_Process_Log] PRIMARY KEY CLUSTERED
----(
----[Date] ASC,
----[MessageID] ASC
----)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [Admin_Data]
----) ON [Admin_Data]
----GO
GO

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Oct 3, 2007

Hi,

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I'm using sql 2005

Thanx

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Jul 23, 2005

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Apr 17, 2005

I know the shortcut to 'defragging' the database to eliminate and
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1. I like to know how things work.
2. I can not create maintenance plans with my hosted provider.
I use the following T-SQL to rebuild all indexes on all tables:

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But, does that not only address indexes? What about getting whitepace
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Am I over-thinking this?
When you're paying for SQL by the MB and generate a lot of data (with a
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Mar 9, 2007

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Apr 15, 2015

I have a clustered index which shows as having a fragmentation level of 66% according to sys.dm_db_index_ physical_ stats.avg_ fragmentation_ in_ percent.

But no matter what I try the fragmentation level doesn't budge. And yes I'm updating the statistics after each attempt.Its not a huge issue the table only has 348 records. I'm testing a fixing fragmentation maintenance script. In Ironing out the syntax of my script I've fixed the fragmentation of indexes of over 65 % anyway..I've come across and index that I can't defragment. I've tried

ALTER INDEX ALL ON [GRIDINFO] REBUILD WITH (FILLFACTOR = 90)

I've tried

ALTER INDEX ALL ON [GRIDINFO] REORGANIZE

I've tried

DBCC INDEXDEFRAG (MYDATABASE, 'GRIDINFO', PK__GRIDINFO__3214EC2721F5FC7F);

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dbcc showcontig('GRIDINFO','IDX_GRIDINFO1') with tableresults , all_levels
go
DBCC SHOWCONTIG ('GRIDINFO')
go
sp_helpindex 'GRIDINFO'

[code]....

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Oct 15, 2007

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TIA,

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1 Index2 DB1 Table6 70.33456 0.03
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Oct 18, 2012

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What factors would make you decide to use DBCC DBREINDES instead of DBCC DEFRAG when you notice index defragmantation?

Thanks.

ekareem

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