How To Defrag A Table?

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.



ADVERTISEMENT

Defrag Table With No Clustered Idx

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.

View Replies View Related

Automating Table Defrag

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?

View Replies View Related

Defrag Or Not To Defrag

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

View Replies View Related

Database Defrag

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

View Replies View Related

Possible Defrag Needed?

Hi all,

I have started to look at the way our production DB has been defined and set up, with the view to improving performance.

The DB is now 11gb, and the original size was set up as 3000mb, the rest has been take in 10% additional extents.

Now, back in my DB2 DBA days, this was a bad thing to have any data spread across extents as they may not be contiguous. I am assuming that is the same with SQL Server. Can someone confirm/deny this?

If this is the case, how can I get the DB back into one primary partition?

Thanks in advance.

Mike

View Replies View Related

Defrag SQL SERVER

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

View Replies View Related

Defrag The Drive

Hi

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

Please Advice.


Thanks

View Replies View Related

Index Defrag

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.

View Replies View Related

Defrag / Reindex

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

View Replies View Related

Automating Defrag.exe

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

Canada DBA

View Replies View Related

DEFRAG Disk Drive

SQL 2000We took SQL Server offline last night and defragged the SAN. Should wereindex or will be be okay ?Thanks,Craig

View Replies View Related

Does Index Defrag Get Logged?

I've noticed a huge transaction log size after having run an
index defragmentation. Does a defrag get written to the transaction
log really? (Assuming the full recovery model.)

View Replies View Related

How To Defrag SQL Server 2000

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.

View Replies View Related

Benefits Of Win2000 Defrag

Is there a big performance advantage to using the standard defrag utility that comes with Win2000 for servers with SQL 2000 on them. I have seen the ads for buying a specific defrag product. Is there a big advantage to the commercially created products VS what's internal to Win2000?

View Replies View Related

Defrag Indexed Views?

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!

View Replies View Related

How To Defrag The System Tables.

I just ran some dbcc showcontig against some system tables in my production databases in sql 7.0 and found out these tables are heavily deframented. Is there a way to defrag these tables other that using dbcc dbreindex which will not work on system tables.



Thanks,



Jim Zhong

View Replies View Related

YADS -- Yet Another Defrag Script

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

View Replies View Related

Index Rebuild Does Not Defrag

Hi,

After issuing an index rebuild on a primary key index (and updating statistics), the index still shows a scan density of 12.5%!

Any ideas on why the rebuild doesn't seem to do anything on the fragmentation levels?

I'm using sql 2005

Thanx

View Replies View Related

MS SQL Question Regarding Page/index Defrag.

I know the shortcut to 'defragging' the database to eliminate and
reclaim 'whitespace' in data and index pages is to setup a maintenance
plan. This doesn't work for me for two reasons:
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:

-- exec sp_MSforeachtable "DBCC DBREINDEX ('?', ' ', 90)

But, does that not only address indexes? What about getting whitepace
back from data in tables themselves?
Am I over-thinking this?
When you're paying for SQL by the MB and generate a lot of data (with a
fair amount of churn) you want to keep it optimized and efficient,
right?

View Replies View Related

Dbreindex Vs Index Defrag Question

Does anyone know if dbreindex and index defrag ideally perform the same function? I have been told that index defrag does not hold locks on a table when executed and dbreindex does. Other than this is there any difference between the two functions? My understanding was that dbreindex reindexes the data stored in a table for faster reads and index defrag removes purged data. Am I correct? I am currently running both functions on my SQL server and was advised that I really only need to run the index defrag job. Is this advise correct?

View Replies View Related

Turn Sql Serveice Off Before Performing Disk Defrag?

We have a Windows 2003 R2 server running Sql 2005. Should we stop the sql server engine prior to running the "Defrag" utiltiy that comes with the OS? (Maybe we should also disable the NIC card on that machine too....?)
 
TIA,
 
barkingdog

View Replies View Related

DBCC DEFRAG Vs DBCC DBREINDEX

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

Thanks.

ekareem

View Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved