rollback delete command

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rollback delete command

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shiwani2002sg

Posted Friday, July 18, 2008 3:32 AM

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if by chance i run a delete command ,n sme rows from some table get deleted ,then what is the command to rollback the command or immediate command. so that i can retrieve the deleted rows

Post #536573

stephen.christie

Posted Friday, July 18, 2008 3:38 AM

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Good Day,

You can use the "BEGIN TRAN" and "COMMIT TRAN" OR if you need to rollback then just use "ROLLBACK"

BEGIN TRANSACTION @TranName;
GO
USE AdventureWorks;
GO
DELETE FROM AdventureWorks.HumanResources.JobCandidate
WHERE JobCandidateID = 13;
GO

COMMIT TRANSACTION MyTransaction;
GO

The Rollback syntax

ROLLBACK { TRAN | TRANSACTION }
[ transaction_name | @tran_name_variable
| savepoint_name | @savepoint_variable ]
[ ; ]

Hope this helps you

regards
Stephen

Post #536576

free_mascot

Posted Friday, July 18, 2008 3:39 AM

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You can't recover deleted rows unless and untill you are using checkpoint. To rollback checkpoint is must.
Resoultion:
1. You can restore the backup with stop at otion and extract the data. (Best Option)
2. You can use 3rd party tool to read the log and find out more. Not sure howfar it will help?

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Post #536578

GilaMonster

Posted Friday, July 18, 2008 4:49 AM

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shiwani2002sg (7/18/2008)

if by chance i run a delete command ,n sme rows from some table get deleted ,then what is the command to rollback the command or immediate command. so that i can retrieve the deleted rows

Unless you started an explicit transaction before you ran the delete, there is no command that will retrieve the rows. You will have to locate a backup of the database.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #536618

GilaMonster

Posted Friday, July 18, 2008 5:05 AM

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free_mascot (7/18/2008)

You can't recover deleted rows unless and untill you are using checkpoint.

Checkpoints happen automatically and just write dirty data pages to disk. It's BEGIN TRANSACTION that allows data modifications to be rolled back.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #536629

Andras Belokosztolszki

Posted Friday, July 18, 2008 5:13 AM

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GilaMonster (7/18/2008)

shiwani2002sg (7/18/2008)

if by chance i run a delete command ,n sme rows from some table get deleted ,then what is the command to rollback the command or immediate command. so that i can retrieve the deleted rows

Unless you started an explicit transaction before you ran the delete, there is no command that will retrieve the rows. You will have to locate a backup of the database.

If you need to revert to the backup, you may even want to explore some third party tools that allow you to do table and row level restore using the SQL Server backup. If the backup is older than you need, and you are desperate, you can also dig out a lot of information about the deleted rows from the transaction log.

Regards,
Andras

Andras Belokosztolszki, MCPD, PhD
GoldenGate Software

Post #536633

Jake Shelton

Posted Thursday, September 09, 2010 9:06 AM

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GilaMonster (7/18/2008)

free_mascot (7/18/2008)

You can't recover deleted rows unless and untill you are using checkpoint.

Checkpoints happen automatically and just write dirty data pages to disk. It's BEGIN TRANSACTION that allows data modifications to be rolled back.

Hello Gail, you get about, don't you? BigGrin

Let me ask you this; if he issues a Delete statement at 5pm, demolishing 50 rows in .05 seconds, could he not take a TLog backup at 5.05pm, and then do a point-in-time restore to 4.59Pm?

Post #983204

GilaMonster

Posted Thursday, September 09, 2010 9:13 AM

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Providing he had a backup, had the DB in full recovery and had an unbroken log chain, yes. However that's not a rollback (which is what the question asked)

p.s. 2 year old thread.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Post #983212

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