Thursday, 15 November 2012

Accidental DELETE and UPDATE

Introduction
Accidental DELETE and UPDATE?  Data loss…
This article gives us a clear idea about it and what situation we can recover it.



When we can recover
1.    If we perform DELETE and UPDATION within 
     TRANSACTION a simple ROLLBACK  
     TRANSACTION can solve this problem.

2.    If you using Logged or Audit data by using Trigger or similar.

3.    If you take regular backup of our database.
If this scenario not supports, it is not possible to retrieve deleted or updated records, easily from MS SQL Server.

So What the Alternate
There are some alternate solutions that we can use in case of Accidental DELETE and UPDATE.

1.    SQL Server keeps log for each deleted records. 
     We can query these logs via fn_dblog MS SQL server function.

   Select [RowLog Contents 0]
         FROM   sys.fn_dblog(NULL, NULL)
         WHERE  AllocUnitName = 'dbo.TableName'
                AND Context IN ( 'LCX_MARK_AS_GHOST', 'LCX_HEAP' )
          AND Operation in ( 'LOP_DELETE_ROWS' )

      for this I am referring a beautiful blog written by "Mr. Mahammad Imran".

     Article named "How to recover deleted data from SQL Server"


2.    ApexSQL Log by ApexSQL data driven is a SQL Server recovery tool capable of 
    reading transaction log data and recovering lost database data by rolling back     
    transactions to their original state.

    The Article references is

References

Hope by this we can solve our problem. But I personally preferred ApexSQL Log. If have you any suggestion please make comments.
Hope you like it.


Posted by: MR. JOYDEEP DAS

2 comments:

  1. There is good news that I want to share with all of my readers that ApexSQL provide me "ApexSQL Universal Studio bundle with 1 year subscription" free.

    Thanks to ApexSQL.

    ReplyDelete
  2. This is really fantastic article

    Thanks to Irfan also for original post.

    ReplyDelete