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undo sql alter command

Posted on 2010-11-10
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Last Modified: 2012-05-10
I altered a table and lost all the data on that table , is there anyway to undo this?
I have a back up on 9 aug 2010 , too old . i cant loose the data from that date till today
Hope anyone can help
USE [TFI]

GO



IF  EXISTS (SELECT * FROM dbo.sysobjects WHERE id = OBJECT_ID(N'[DF__Invoices__Dates__6319B466]') AND type = 'D')

BEGIN

ALTER TABLE [dbo].[Invoices] DROP CONSTRAINT [DF__Invoices__Dates__6319B466]

END



GO



USE [TFI]

GO



/****** Object:  Table [dbo].[Invoices]    Script Date: 11/10/2010 22:27:05 ******/

IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Invoices]') AND type in (N'U'))

DROP TABLE [dbo].[Invoices]

GO



USE [TFI]

GO



/****** Object:  Table [dbo].[Invoices]    Script Date: 11/10/2010 22:27:06 ******/

SET ANSI_NULLS ON

GO



SET QUOTED_IDENTIFIER ON

GO



SET ANSI_PADDING ON

GO



CREATE TABLE [dbo].[Invoices](

	[Dates] [smalldatetime] NULL,

	[Invoice] [numeric](18, 0) NOT NULL,

	[Locator] [char](6) NOT NULL,

	[Agency] [char](3) NOT NULL,

	[Agent] [char](2) NOT NULL,

	[Net] [money] NOT NULL,

	[Sell] [money] NOT NULL,

	[Pax] [char](1) NOT NULL,

	[CRS] [char](1) NULL,

	[FareType] [char](1) NULL,

	[Airline] [char](2) NULL,

	[DepCity] [char](3) NULL,

	[ArrCity] [char](3) NULL,

	[FirstName] [char](30) NULL,

	[LastName] [char](30) NULL,

	[DepDate] [char](10) NULL,

	[Email] [char](200) NULL,

	[Ship] [char](2) NULL,

	[Status] [char](15) NOT NULL,

	[Comn] [money] NULL,

	[TAcomn] [money] NULL,

	[Delivery] [money] NULL,

	[Fee] [money] NULL,

	[Ccharge] [money] NULL,

	[TAgent] [char](20) NULL

) ON [PRIMARY]



GO



SET ANSI_PADDING OFF

GO



ALTER TABLE [dbo].[Invoices] ADD  DEFAULT (getdate()) FOR [Dates]

GO

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Question by:Nabilbahr
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11 Comments
 
LVL 76

Expert Comment

by:arnold
Comment Utility
If you have your database in full recovery mode, run the transaction log backup and then you can replay the transaction log with the restoration of the full prior backup to get the database restored to the time prior to the execution of the alter directive.
If your database is in Simple mode, you are out of luck.
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Author Comment

by:Nabilbahr
Comment Utility
Great   rrecovery model is full , what is the steps i should take now
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Accepted Solution

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arnold earned 500 total points
Comment Utility
you must have a huge Log file LDB if this is an active database.
issue a backup for the transaction log.

NOTE:     Make sure you do not backup the database or you will lock in the changes.


right click on the database, under tasks select backup, under what you want to backup select the transaction log.
Using the graphical SSMS right click on the database and select tasks\back up
under the backup type, select the transaction log.

http://technet.microsoft.com/en-us/library/ms179478.aspx

It includes links on how to restore database using the transaction logs as one of the links.

The one of interest to you for the restore is:
http://technet.microsoft.com/en-us/library/ms190982.aspx

If you've not tested the restore of the prior database, you should backup the current one to avoid losing more data.

If you have the option to try the restore on a different system without making the existing setup worse, I'd suggest you do that when it is successful, you might need only copy the data from the invoice table only.


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Author Comment

by:Nabilbahr
Comment Utility
now i'm trying to run the transaction log backup .  would that be a new file that i save somewhere?

how to replay the transaction log with the restoration of a full prior back up?

I'm confused.  does that mean I need the last back up file (.bak file)  in this process?
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Expert Comment

by:arnold
Comment Utility
FYI, when altering table schema while trying to maintaining data, never issue a Drop table!
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LVL 75

Expert Comment

by:Aneesh Retnakaran
Comment Utility
since your backup is very old , you may need to use some theird party tools like
http://www.red-gate.com/products/SQL_Log_Rescue/
http://www.apexsql.com/sql_tools_log.aspx
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LVL 76

Expert Comment

by:arnold
Comment Utility
You would need to bring the database to the point in time where the data is in.
You would need to first restore the full backup and leave it in recovery mode.
You would then use the transaction log (.trn) file from your recent backup to bring the database to the state in a point in time prior to your issuing the alter database scheme.
and here you will bring it back online at the conclusion of the restore.

I've not tried it, but do not believe you can use the transaction log to roll back the database to the state prior to the transaction.


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Expert Comment

by:arnold
Comment Utility
once you are done with this, make sure to setup a maintenance plan/sql jobs that will regularly backup your database and transaction logs such that the restore/recovery will be quicker with a significant reduction in the possibility of massive data loss.
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Author Comment

by:Nabilbahr
Comment Utility
now i cannot restore because of this error
"my database is in use by this session. it is recommended that the master database be used when performing this operation"

I set the default database to master for all logins  but still the same error
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Expert Comment

by:arnold
Comment Utility
Try restoring to a new database name.

Note that to restore you have to terminate any other sessions.
You can change the database to single user.

You may have an open query window for this database and this is the error.
i.e. you have SSMS open and you have one of the windows reflecting this database for the query window.  If you have many windows or do not want to take the time looking. exit out of the SSMS and start it a new. or close all tabs in ssms such that you can only see the object explorer tab and the database listing pane.  

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Author Comment

by:Nabilbahr
Comment Utility
the problem is solved
using the master db as default restarting the SQL services helped the backup
thanks all
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