Backup is considered as a key to perform recovery of SQL database object after the corruption of the entire database. MS SQL server provides a number, Log Sequence Number (LSN) during the process of database restoration, which can be used as recovery point. Moreover, LSN helps to perform the differential backup. When users can perform a differential backup, the bitmap corresponding to backup is also generated. All changes were made during the backup, those are marked in a bitmap, otherwise database errors are found. With this differential backup, users can easily restore database objects from the damaged database. But, sometimes during the restoration process users may receive the following error message:
Page P_ID, index ID I_ID, object ID O_ID, has been modified, but is not marked as modified in differential backup bitmap. It also has a symbolic name such as DBDC_DIFF__MAP__OUT_OF_SYNC. Here, we are going to discuss different ways to let users understand how to troubleshoot SQL server error 2515.
SQL Server Error 2515 - Cause
SQL error 2515 message appears due to the database, check that is only executed if the differential bitmap is error-free. This error proposes that page precise with P_ID has a Log Sequence Number (LSN) and has a superior value than the differential base LSN in File Control Block or differential reference LSN in Backup Manager. Thus it occurs when this modification not to be noticeable in the differential backup bitmap. Apart from that, some other reasons for SQL Corruption is that virus attack, inappropriate use of database, application malfunctioning, hardware malfunctioning and so on.
Fix SQL Server Error 2515 Manually
Here are following steps that will help to resolve error 2515 on Microsoft SQL Server. Let us have a look:
- Check for Hardware Failure
Run hardware diagnostic tests and correct any problem. After that, examine the Microsoft Windows, application logs and SQL error log file to see whether the error encountered as a result of hardware failure. Fix any kind of hardware-related issues that are contained in log files.
If users have persistent data corruption issues, try to swap out many hardware components to isolate every problem. Check things to keep in mind that the system does not enable the write-caching on the disk controller. If the user suspects write-caching to be a problem, contact the hardware vendor.
Finally, users may find it useful to switch to the new hardware system. This switch might include reformatting a hard drive and reinstall the operating system.
- Restore Data from Backup
If the issue is not related to hardware and a clean backup is available, recover database from the backup. Afterward, if no clean backup is available then, run the DBCC CHECKDB command without REPAIR clause to determine the extent of data corruption.
DBCC CHECKDB command will recommend a REPAIR clause to utilize. Next, run DBCC CHECKDB script with an appropriate REPAIR clause to repair corruption.
Note:If users are not sure what effect DBCC CHECKDB with REPAIR clause has their own data, contact the support provider before running this specific statement.
If running DBCC CHECKDB command with any REPAIR clauses that does not correct the problem, contact the support provider.
Resolve SQL Error Code 2515 - Automated Approach
If the above-stated method does work very well then, users can take help of a reliable third-party tool named as SQL Recovery. It is designed in such a way to repair corrupt MDF and NDF file in SQL Server Databases. It is capable enough to automatically fetch the SQL server name while exporting to SQL Database. It has an easy-to-use interface that even a novice user can use it without taking an external help. Some of the impressive features of the tool are mentioned below:
- Allows to Repair SQL Server Database like Primary & Secondary
- Facility to Scan and Restore Multiple Secondary Database files (.ndf )
- Recover Rules, Triggers, Functions, Tables, and Stored Procedures
- Select Desired Items to Save File with Schema or Schema and Data Both
- Export selective data items from MDF or NDF file & save them properly
Time to Conclude
In this blog, we have discussed two manual ways that will help to understand how to troubleshoot SQL error 2515. Also, we have covered all possible reasons due to which this error code generates. These manual ways have some consequences, thus, users want to take help of a trusted third-party tool. Henceforth, in order to perform a simple, easy recovery procedure, users can use SQL recovery software. It is one of the best methods to remove the SQL Server error 2515 without any difficulty.
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