Clustered Index Corruption in SQL Server Database

You may receive the following error messages in SQL Server:

Server: Msg 3624, Level 20, State 1, Line 1
Location: recbase.cpp:1378
Expression: m_offBeginVar <>
SPID: 51
Process ID: 948
Connection Broken
Or
[Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionCheckForData (CheckforData()).
Server: Msg 11, Level 16, State 1, Line 0
General network error. Check your network documentation.
Connection Broken

These error messages mostly receive when the user attempts to insert a column to the existing table through INSERT command. If the applied transaction also retains the foreign key reference to the column, which has been affirmed as the exclusive clustered or non-clustered index key on the table, then this could be the reason of this problem. In this situation, the clustered index gets corrupted or damaged. When the added column attempt gets failed, the clustered index can get damaged and all of the data may become inaccessible.

If the clustered index got corrupt, then, no report will be generated by running the DBCC CHECKDB, but the access performance of the database gets degraded and hence you need an instant SQL recovery through the trustworthy tool and choose the best sql database repair software for better results.

The best way out to SQL repair totally, is to make use of the third party applications which are well suited for this situation. In fact, they avail a secure MDF recovery and so are recommended for the best part. With the intuitive user interface, this MDF repair utility helps you to work with its easy process.

MDF Corruption Due to OS Errors or I/O Check Failure

Sometimes you may face system or hardware problems while writing data to or reading from the SQL Server 2000 database. These issues can make your database inaccessible and cause serious data loss. In such situations, all your critical data becomes unusable and you need to opt for SQL database recovery.

While reading from or writing to the SQL Server database, you might encounter the below error message:

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

This error message may occur every time when you start SQL Server and access the MDF file.

Root of the issue

Microsoft SQL Server 2000 displays this message when any of the below given conditions are true:

* Operating system problem: A read Windows API (Application Programming Interface) call or write API call isn’t successful and MS SQL Server encountered operating system error which is related to API call.
* I/O logical check failure: This behavior may occur if the read API or write API is successful but particular logical checks on database are unsuccessful. This situation prevents SQL Server to access data from MDF file.
* MDF Corruption: This problem may occur if your MDF file is corrupted and thus SQL Server can not recognize the file and access data from it. This behavior causes serious data loss.

Resolution

There are three possible solutions of this issue:

* If the problem is due to operating system error then you need to fix the Windows API issue. It may require repair or reinstall.
* Use DBCC CHECKDB command to check any logical errors in the database. It is an in-built command in SQL Server to fix application level errors.
* Use SQL Database Recovery software to scan the corrupted database and recover all the inaccessible data from it.

These software are specifically designed to repair SQL database in most of the corruption scenarios. These software come equipped with interactive graphical user interface and thus allow you to have ‘Do It Yourself’ recovery.

These software can recover all the MDF file objects including tables, reports, triggers, stored procedures, constraints, indexes, views etc. They provide absolute results with their read-only and non-destructive design.

Tips to resolve “Object ID O_ID, index ID...” Error Message

In SQL Server database, the indexes are primarily organized as B-trees. Every page in an index B-tree is known as Index node. These B-trees enable you to effectively handle your data saved in tables and indexes. While these B-trees allow you to properly manage your data, corruption or damage in them can also result into inaccessibility of records saved in the SQL database. In such situations, an easy way to access your data is by restoring it from an updated database backup. However, if no backup is available or backup file(s) itself gets corrupted, then you will need to use advanced SQL recovery tool to repair your database.

As a practical case, you encounter the below error message when you attempt to access the records saved in your Finance database:

“Object ID O_ID, index ID I_ID: Page P_ID is empty. This is not permitted at level LEVEL of the B-tree.”

Data stored in the Finance database becomes inaccessible after the above error message appears. Furthermore, the above error message repeatedly occurs each time you attempt to access the records saved in the Finance database.

Cause:

The root cause for the occurrence of the above error message is the B-tree above the leaf level is empty or corrupted. This further corrupts the table indexes and makes their data inaccessible. Corruption can occur due to logical or physical factors.

Resolution:

To resolve the above error message, you will need to follow the below measures:

· In case of corruption caused due to hardware failure, you will need to run hardware diagnostics and swap the damaged hardware components with new ones.

· In case of logical database corruption, you will need to run DBCC CHECKDB command (without repair clause) to identify the extent of Finance database corruption. After identifying the corruption, run DBCC CHECKDB command with appropriate repair clause.

However, if DBCC CHECKDB with repair clause fails to resolve the issue, then you will need to opt for third party SQL database recovery tool. These SQL recovery developed by highly talented data recovery experts and provide risk-free database repair.