Tuesday, July 24, 2012

Unraveled: Possible Resolution Methods to Work Around Database Corruption in SQL Server 2008

SQL Server 2008 has been specifically designed to work with large data sets and to handle multiple users. It facilitates ease of use and maintenance through its feature-laden application interface. It can easily interpret the bandwidth required by the users and considerably help to improve performance. However, it has a few downsides. Any unexpected server crash may leave your SQL database in a suspect state. This database corruption would thrive if no timely action is taken to counter the problem. In these circumstances, all your valuable database components become inaccessible. To overcome this problem, you should go for SQL server recovery.

Let us consider a real-world scenario. Suppose you use MS SQL Server 2008 on your Windows XP based computer. You may occasionally notice the below error message in your application log:

'Table error: Object ID O_ID, index ID I_ID, partition ID PN_ID, alloc unit ID A_ID (type TYPE). Duplicate keys on page P_ID1 slot SLOT1 and page P_ID2 slot SLOT2.'

The above error is generated by 'SQLengine' because there are two slots having the same or identical keys. In addition, the error may pop-up as a result of corruption in your SQL database.

To work around this problem, you need to isolate the cause of the error and accordingly, work out a solution. You can try the given steps in order to resolve the issue:
  • Hardware failures and defects cause corruption in SQL databases more frequently than other sources. First off, you should view the SQL Server error log and the Windows system and application logs to check for hardware failures. If you encounter any hardware problem, run hardware diagnostics.
  • If you continue to face problems, you should try swapping different hardware parts to examine the root cause. Additionally, ensure that the disk controller does not perform write caching.
  • If the issue is not hardware-specific, you can try restoring the database from a recent clean backup.
  • If you do not have a backup, run DBCC CHECKDB with an appropriate repair clause to fix database corruption.

If you receive the same error again, then take help of advanced third-party SQL database recovery software. These competent tools incorporate advanced, proprietary mechanisms to repair your damaged SQL database easily and recover all lost or inaccessible objects, such as tables, views, keys, indexes, constraints, and stored procedures. Furthermore, they are compatible with Windows 7, Server 2008, Vista, Server 2003 and XP.

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