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Detailed Information about "Sql Server Detected A Logical Consistency-Based I/O Error: Incorrect Checksum"

Symptom:

When attaching a .MDF database in SQL Server, you see the following error message:

SQL Server detected a logical consistency-based I/O error: incorrect checksum (expected: 0x2abc3894; actual: 0x2ebe208e). It occurred during a read of page (1:1) in database ID 12 at offset 0x00000000002000 in file 'xxx.mdf'. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online.(Microsoft SQL Server, Error:824)

where 'xxx.mdf' is name of the MDF file being accessed.

Sometimes you the .MDF database may be attached successfully. However, when you try to execute a SQL statement, such as

SELECT * FROM [TestDB].[dbo].[test_table_1]

you will also get the above error message.

Screenshot of error message:

logical consistency-based I/O error: incorrect checksum

 

Precise Explanation:

The data in MDF file are stored as pages, each page is 8KB. Each page has an optional checksum field.

If SQL Server finds the checksum values in some of the data pages are invalid, then it will report this error.

You can use our product DataNumen SQL Recovery to recover the data from the corrupt MDF file and solve this error.

 

Sample Files:

Sample corrupt MDF files that will cause the error:

SQL Server version Corrupt MDF file MDF file fixed by DataNumen SQL Recovery
SQL Server 2005 Error4_1.mdf Error4_1_fixed.mdf
SQL Server 2008 R2 Error4_2.mdf Error4_2_fixed.mdf
SQL Server 2012 Error4_3.mdf Error4_3_fixed.mdf
SQL Server 2014 Error4_4.mdf Error4_4_fixed.mdf