Numerous SQL errors, such as error 800040E104 and error code 10, can frequently surface. However, certain SQL errors persistently plague the server, creating a challenging dilemma for users seeking resolutions. One notable instance is error code 823, a highly critical and intricate SQL error. This error has the potential to disrupt the integrity of server files, necessitating prompt attention and rectification.

In this article, we'll delve into the causes of SQL error code 823 and provide effective solutions to resolve this issue promptly.

Reasons for SQL Server Error code 823

Determining the precise cause of this error may not always be feasible, but it typically arises when SQL Server rejects an Input or Output command, essentially failing to execute the requested Input or Output operation.

SQL Server utilizes an Application Programming Interface (API) to interact with the Windows OS, facilitating various operations. When conflicts arise with the API during an operation, the server promptly generates error 823. It's important to note that this error can manifest in two distinct forms: as an Operating System error or as an Input/Output Logical Check Failed error.

There might be numerous factors contributing to the mismatch between the API and the server. A few of these reasons include:

  • Common user errors in the system
  • Hardware corruption errors that affect the data
  • System corruption errors
  • Virus invasion into hard drive where SQL Server is installed
  • Corrupt Database files that often make SQL Server inaccessible
  • SQL Server update or reinstallation
  • Inconsistency in system files
How to deal with SQL Server Error code 823?

When opting for manual recovery methods, addressing operating system-level errors proves to be a rather intricate process, demanding a significant investment of time and patience. Consequently, users should reach out to their hardware and administrative vendor for assistance in rectifying this issue.

However, you can execute the following Steps by yourself to eradicate this error:

  • Run DBCC CHECKDB statement on the corrupt database
  • Scrutinize the suspected pages
  • Verify the consistency of the database
  • Restore database from the backup files
  • Check Windows Application Event Log

If the steps mentioned above do not prove effective in resolving the SQL Server error, it is advisable to consider employing a third-party SQL recovery tool such as Kernel SQL Recovery. This tool is designed to repair corrupt files, eliminate errors, and generate fresh database files. Kernel SQL Recovery is user-friendly and comes equipped with advanced features for rectifying SQL errors and restoring databases. It employs a straightforward and speedy process to address the "error 823."

  • Step 1: Install and launch the software. Select the SQL database files to be recovered and click the ‘Recover’ button. Error Log
    Note: In case, the user is not aware of the version of their files, check the ‘Auto detect database version’ checkbox.
  • Step 2: After recovery, preview the recovered files and verify their content. Select the files which you want to restore and click the ‘Save’ button. Error Log
  • Step 3: Provide the login credentials and click ‘OK’. The restoration of files starts. Error Log
  • Step 4: After successful saving, a confirmation will be displayed on the screen. That’s how you can easily fix any error from your SQL Server and protect your data. Error Log


It is very common to face multiple errors while using SQL server and Error code 823 is amongst one of those common issues faced by SQL Administrators. But, it can result in data loss if not fixed quickly. Although, administrators can opt for manual methods, they are not always helpful in fixing the error. So, we talked about an automated solution that can be used to Repair MDF files quickly.