Sunday, June 13, 2010

I/O Logical Check Failure Cause SQL Server Database Corruption

Like other databases and files, Microsoft SQL Server database may also come across various corruption issues. The corruption can take place due to various reasons, including the internal database or SQL Server application issues and system related problems. One major system related problem, which can cause MDF (Master Database File) corruption, is I/O logical check failure. In such situations, the database becomes totally inaccessible and you come across severe data loss situations. In order to get your mission critical data back, you need to repair and restore the corrupt database using SQL database recovery solutions.

The I/O logical check failure can be indicated by various error messages, which includes the following one:

“Error 823
I/O error detected during at offset in file ''”

The above error may also occur when SQL Server come across other system errors. After this behavior, SQL Server database become totally unusable. In order to sort out this problem, you need to fix it through SQL recovery methods.


If the read Windows API (Application Programing Interface) call or writer API call for SQL Server database is successful, but some particular logical checks are unsuccessful. In such cases, error 823 occurs, which resembles the following:

“2003-09-05 16:51:18.90 spid17 Error: 823, Severity: 24,
State: 2
2003-09-05 16:51:18.90 spid17 I/O error (torn page) detected during read at offset 0x00000094004000 in file 'F:\SQLData\mydb.MDF'..”


In order to work around this behavior of Microsoft SQL Server database and perform SQL Server recovery, you should first run DBCC CHECKDB utility on the affected or damaged MDF file. Before you try to fix any system related issue with MS SQL Server, you should first check the database and sort out the problems. If DBCC CHECKDB statement fails to detect or fix any error, please check the Application Event Log of Microsoft SQL Server.

If the above method fails to find and fix any errors in Microsoft SQL Server, you need to restore the database from a valid and recent backup to get your valuable data back. In case backup is not available, you have to opt for third-party applications to repair and restore the corrupted MDF file.

The repair mssql applications are particularly designed to methodically scan entire database and extract all inaccessible data from it. The software have read-only approach and simple graphical user interface to ensure safe and easy recovery.

SQL Recovery is the most efficient and powerful utility to ensure absolute recovery in all MDF corruption situations. It works well with Microsoft SQL Server 2008, 2005, and 2000. The software restores all MDF file objects, such as tables, reports, forms, macros, stored procedures, and triggers.

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