Different Ways to Fix SQL Server Error 2515

Are you facing SQL Server error 2515 message? Do you want to know how to handle this situation without losing any data? If yes, then just relax. Go through this SQL error troubleshooting article, and know the factor responsible for this issue. And, how to get rid of 2515 error in the most simplest way.

Table of Content

• Causes of SQL Error 2515
• SQL Server Error 2515 Automated Solution
• Fix SQL Server 2515 Error Code Manually
  • Check Any Hardware Defect
  • Extract Data from Backup File
  • Use DBCC CHECKDB
• Bringing It All Together
• FAQs

SQL Error 2515 – Potential Cause

SQL Server assigns a unique LSN(or Log Sequence Number) to every record in the transaction log. This LSN number further used in the restoration process of damaged database recovery. However, when a user tries to execute differential backup for the database, a special database page entitled as Differential Bitmap get associated with it.

The differential backup bitmap prime function is to keep the record of how much data have been modified since recent full backup. Thus, for differential backup process, bitmap ensures the last full backup LSN number. Thereafter, file extents in bitmap that labeled as checked are taken place for the differential backup purpose. So, it can be concluded that whole backup works on a LSN chain. If there is an issue occurs in Log Sequence Number, the entire SQL differential backup gets into the trouble.

Hence, while taking differential backup process, it is important that all the changes in LSN value should be updated in the differential backup bitmap. In such a situation, when the page is not marked as modified in bitmap during backup, it will ultimately lead to various problem during database restoration process. Also, the database page LSN value got greater number than the differential base LSN in file control block. As a result, the SQL error 2515 occurs because the changes have not been updated in differential backup bitmap and the following message appears in SQL Server.

Server: Msg 2515, Level 16, State 1Page P_ID, object ID O_ID, index ID I_ID has been modified but is not marked modified in the differential backup bitmap.

Quick Solution to Deal With SQL Server Error 2515

When the SQL DBCC CHECKDB command becomes failed to recover data from the corrupted SQL database file, then take the help of impeccable SQL Recovery Tool. It is an outstanding utility that has a strong scanning technique due to which users can quickly retrieve data from corrupt SQL MDF (Primary database) and NDF (Secondary Database) files without losing any single bit of data.

Moreover, it covers the recovery of Triggers, Rules, Functions, Tables, and Stored Procedure from the SQL database in the minimum span of time. The best part of this software is it widely supports all the SQL Server editions, including SQL Server 2019, 2017, 2016, 2014, 2012.

Download the tool & then follow the steps mentioned below:

1. Launch Tool & then Add MDF files in the application.
2. Select the Quick or Advanced Scan mode to proceed further.
3. Set the Destination Platform & Set the Database Objects here.
4.  Hit the Export/Save button to fix the SQL Server Error 2515.

Manual Methods to Fix SQL Server Error 2515

To remove this error code 2515 in SQL Server 2017 / 2016 /  2014 / 2012, a user can use this following workaround.

Check Any Hardware Defect

It is evident from the above that, when the database page is not checked in bitmap during differential backup, a LSN value mismatch issue happens. This causes occurrence of SQL error 2515 in the database. The most potential reason for this glitch is hardware component. So, take the help of hardware diagnostic and find the issue in it. Besides this, analyze the Windows System, Program Logs, and SQL Error Logs in order to confirm any hardware failure. If there is any hardware associated problem available in log, then fix it.

Extract Data From Backup File

If the problem does not arise by any hardware fault, then it is good to restore database from the last clean full backup. To know the complete step of data restoration, you can take the help of this blog to know – How to Restore database from BAK File? After that, take the differential backup of the recently recovered database. By doing this, a new LSN chain created on the bitmap and hopefully it will resolve the SQL Server error 2515.

Use SQL DBCC CHECKDB Command

In such a situation, when there is no clean full backup file present in the SQL database, then use the inbuilt DBCC CHECKDB command. Initially, verify the level of corruption in backup file. After that, use the Repair_Allow_Data_Loss along with DBCC CHECKDB in order to fix the corruption problem in the file.

If the DBCC CHECKDB command unable to resolve the SQL error 2515, then go through the fourth workaround.

Bringing It All Together

It is very much annoying for a SQL Server user to getting SQL Server error 2515 message. So, after considering this error code, we have discussed the major cause of this message. Along with this, we have discussed multiple solutions in order to fix the SQL error 2515. Now, as per the choice, users can try any of the methods to handle this situation.

Frequently Asked Questions –