SQL Server Recover Data After Delete Command Hassle-Freely

While working on the SQL Server database, it is mandatory to manage and keep the data secure. There are situations where the data gets deleted intentionally or accidentally. To SQL Server recover data after delete command, it is important to understand the possible challenges that occur due to the deletion of data, and how the data can be recovered.

With the help of this write-up, we will be discussing the same issue all white trying to resolve the issue without compromising the data security. Let’s begin by understanding the causes and challenges of the delete command in SQL Server.

How DELETE Command in SQL Create Challenges for Users?

The deletion of data from the SQL Server database can be accidental or intentional, respectively. When trying the SQL Server recover data after delete, it is necessary to learn and understand the possible challenges the users might come across due to the DELETE command in SQL. Here are a few issues that can affect the users performance and also result in data loss.

• The first and the major challenge is accidental loss of data due to the DELETE command in SQL Server. While deleting any specific data, row or column from the database table, the user might enter the wrong table attribute or column name, and might end up deleting data accidentally. This can cause much bigger problems for the users and their data.

• The next challenge is the performance issues created due to deletion of large data or large tables in SQL Server databases. The Deletion process might be slower or delayed due the data quantity and can cause operational downtime in the SQL Database.?

• Another challenge faced due to the DELETE command in SQL Server is the growth of transaction logs. With a large number of delete commands in the SQL Serve, the size of the transaction log grows and creates issues with storing other operations of the database.?

Now, take a look at the solutions that can help with the deleted data recovery in the SQL Server database. There are different solutions that will help the users recover the data after the Delete Command in SQL Server.?

SQL Server Recover Data After Delete Using Different Ways

There are different ways using which deleted data recovery in SQL Server can be done. Here we will be taking a look at all the methods that can recover the data after deletion in SQL Server. The first method we are going to discuss is the recovery using SQL Server Management Studio.?

Method 1: Restore Deleted Data in SQL Server Using SSMS

The first method is to restore the deleted data using the SQL Server Management Studio.?

The steps to help the users recover the lost data are as follows:

1. Launch the SSMS) on your device and connect it to the SQL Server instance.
2. Then, right-click on the Databases and choose the Restore Database option.
3. Then click on Browse and select Backup media as File.?
4. Next, click on the Add button to add the backup file for SQL Server Recover Data After Delete, and then click on the OK button.?
5. The deleted data will be restored and a completion message will pop-up.?
6. Next, click on the Ok button again to finish the process.

This method will help the users to restore the deleted data with the help of the backup file. Moving on to the next method, we will now take a look at the solution and understand how it works to restore the deleted data in the database.?

Method 2: Deleted Data Recovery in SQL Server Using LSN

The LSN stands for Log Sequence Number. Log Sequence Number in SQL Server can be defined as an individual identifier that is assigned to each operation in the transaction log. This identifier helps the users identify the specific operations in the SQL Server transaction logs and then restore them as required. The command for the LSN method is given below:?

Step 1: CREATE SQL DATABASE

The first step is to create a database with the name RecoverDataTables and the table name?

DB2 using the following command.

USE [master];

GO

CREATE DATABASE RecoverDeletedTable;

GO

USE RecoverDeletedTable;

GO

CREATE TABLE [DB2] ()

[Sr. No] INT IDENTITY,

[DATE] DATETIME DEFAULT GETDATE(),

[City] CHAR (50) DEFAULT ‘City1’);

Step 2: Insert Values in the SQL Table

Once the database and the table is created, now it’s time to insert the data in the table.

The command to insert data in the table is:

USE RecoverDeletedTable;

GO

INSERT INTO DB2 DEFAULT VALUES;

GO 100

Step 3: Delete Data

After the insertion of records in the table, now it’s time to delete a few records.?

The steps for deletion are:

USE RecoverDeletedTable

GO

DELETE DB2

WHERE[Sr. No]<10

GO

Select * from DB2

Step 4: Fetch Information About the Deleted Data

Till here we have created a database with a table, inserted records, and deleted a few rows from the table. Now it’s time to fetch the information on the deleted rows. For SQL Server recover data after delete, we will now get the information about the lost records.

The steps to get the information on the deleted rows are:

USE RecoverDeletedTable

GO

SELECT

[Current LSN],

[Transaction ID],

Operation,

Context,

AllocUnitName

From

fn_dblog(NULL, NULL)

WHERE

Operation=’LOP_DELETE_ROWS’

This command will help you to view the transaction IDs of the deleted SQL Table Rows.

Step 5: LSN of LOP_BEGIN_XACT Log Record

To extract the time of deletion of the rows, use the Transaction IDs.

The steps for extracting the deletion time are as follows:

USE RecoverDeletedTable

GO

SELECT

[Current LSN],

Operation,?

[Transaction ID],

[Begin Time],

[Transaction Name],

[Transaction SID]

FROM

fn_dblog(NULL, NULL)

WHERE

[Transaction ID]=’0000:0000020e’

AND

[Operation]=’LOP_BEGIN_XACT’

Step 6: SQL Server Recover Data After Delete

To recover the deleted SQL Table Records, convert the hexadecimal LSN values to Decimal form.

The steps to be followed are:

RESTORE DATABASE RecoverDeletedTable_COPY

FROM DISK = 'C:\YourBackupPath\RecoverDeletedTable.bak'?

WITH

MOVE 'RecoverDeletedTable' TO 'C:\YourDataPath\RecoverDeletedTable.mdf',?

MOVE 'RecoverDeletedTable_log' TO 'C:\YourLogPath\RecoverDeletedTable.ldf',?

REPLACE,

NORECOVERY;??

GO

RESTORE LOG RecoverDeletedTable_COPY

FROM DISK = 'C:\YourBackupPath\RecoverDeletedTable_tlogbackup.trn'

WITH

STOPBEFOREMARK = 'lsn:0x00000015:0000002a:0001';

GO

//Here change YourBackupPath or YourDataPath with your actual destination paths //

Now, to check if the records that were deleted, have been recovered or not, we will run the following command

USE RecoverDeletedTable_COPY

GO

SELECT * from DB2

This command will show if the deleted table data has been recovered or not. But, we can see very clearly that the method is not efficient or easy for a nontechnical user to understand. Additionally, The method can create multiple challenges for the users, if the commands are not properly implemented and run. So we will now take a look at the next method that will help the users resolve the issue more professionally.?

Method 3: Restore Deleted Data Using Professional Solution

Now, for SQL Server recover data after delete, we will be using a professional tool that will help both users with technical and non-technical backgrounds to easily restore the data. The solution we are going to use is the SQL Recovery Tool. Let’s now take a look at the steps to how the tool works in restoring the database easily.?

1. Install and run the software and click on the Open Button to add the database files to the tool.
2. Choose Quick or Advanced Scan to check for any corruption in the database.?
3. Enable the Recover Deleted Data checkbox and preview the loaded data after the scanning is completed.?
4. After the preview, click on the Export button to save the recovered data into the database.
5. From the Export window, configure the required settings and choose the SQL Server database option for deleted data recovery in SQL Server.?

By following these steps, you can efficiently recover the data after deletion in the SQL Server. These steps are easy to implement as well as understand by the users with limited technical knowledge.?

Conclusion

With the help of this write-up, we tried to understand the issues encountered due to deleted data in the SQL Server. Additionally, for SQL Server recover data after delete command, users can further face numerous problems while performing necessary operations on the server. We have suggested a few solutions that will help the users to efficiently restore the data after accidental deletion of data in the SQL Server.