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Most of the companies use Microsoft SQL server database for storing their database where database administrator handle all the issue for maintaining the database by the use appropriate SQL server commands. Microsoft SQL server database may be corrupted by Improper system shutdown, hardware failure, SQL Server malfunctioning, virus infection, hardware failure and many more. Once SQL server database gets damaged, the data stored in the SQL Server become inaccessible. In such scenarios, use latest and updated backup, if backup is not updated, then database administrator needs to used a third party SQL recovery software to repair mdf file.

Consider a situation, wherein a database administrator is working on SQL Server database and creating a report. While doing this, the Windows automatically restarts due to power failure. When database administrator restart the system, the SQL server database becomes inaccessible. When the database administrator tries to attach MDF manually, he encounters the given below error message:...

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A page is the most primitive unit of storage in an MS SQL Server database. The memory space allotted to a database file is divided into pages having contiguous address location. An Index Allocation Map (IAM) is a page type that stores the details about the extents used by a table per allocation unit. However, sometimes these pages do not function properly because of database corruption. You should take appropriate corrective measures to recover SQL database. However, if you are not able to restore the database then you should use a third-party mdf recovery software to do the needful for you.

Consider a scenario wherein you encounter the following error message while working on an SQL Server 2008 database table:

“An inconsistency was detected during an internal operation in database '%.*ls'(ID:%d) on page %S_PGID. Please contact technical support. Reference number %ld.”

Cause:...

In MS SQL Server database, a PFS (Page Free Space) page has one byte for each of the pages existing in the file interval it maps. This byte contains a bit that indicates that the associated page is a mixed page. An IAM page includes a mixed page array, which is an array of eight page IDs, to keep the mixed pages that have been allocated to the index. In some cases, when the database goes corrupted, the page containing 'mixed page' bit is not recognized correctly. Thus, you can detect such specific cases of database corruption and, take corrective measures for MS SQL Repair.

Most of the SQL database corruption problems can be analyzed and detected by running DBCC CHECKDB command. Let's consider the below error message, which typically appears when the discussed problem occurs. When you run DBCC CHECKDB command to check the integrity of database, following error might pop up:

Server: Msg 8906, Level 16, State 1, Line 0...

All the users connected to the SQL Server instance have access to a global resource called tempdb system database. This database holds temporary user objects, internal database objects, and row versions that result from data modification. At times, when some allocation checks are performed on this TEMPDB database, they may result in allocation errors and unexpected results. Since TEMPDB cannot be put in offline mode, no fixes are possible for allocation errors in this database. However, for rest of the SQL databases, you can perform MS SQL Repair using suitable tools and utilities.

For exemplifying the given problem, consider, you might start receiving unexpected database access problems in MS SQL Server database. To determine the exact cause of the problem, you run CHECKDB command and the below error message pops up:

“Database tempdb allocation errors prevent further CHECKNAME processing.”...

You may come across SQL Server database corruption if the registry checkpoint of SQL Server agent is missing. In this case, SQL Server Agent cannot be found and MS SQL Server cannot start up. In such situations, MDF (Master Database File) of SQL Server becomes inaccessible and you come across critical data loss situations. To work around this problem, MDF Database Recovery is essential, if you do not have an updated backup.

As a practical example of this problem, consider this scenario:

The Registry checkpoint of SQL Server Agent is missing due to some unexpected deletion or unexpected corruption problems in the clustered instance of MS SQL Server 2008.

Clustered instance of Microsoft SQL Server 2008 is repaired.

In the above scenario, you cannot find the registry subkey, which is associated with the SQL Server Agent, in list of the checkpoints of SQL Server Network Name resource. SQL Server Network Name is associated with clustered instance. Furthermore, updates of SQL Server Agent application configuration aren't spread to other cluster nodes when SQL Server resource group goes to the nodes...

A particular set of resources, which have dependencies on several other resources is created, when you set up MS SQL Server on any cluster. You should not ever alter the default resources dependency tree. It may lead to several consistency and integrity issues in Microsoft SQL Server database. It may also lead to serious database corruption problems and need MDF Recovery to work around the issue.

Microsoft SQL Server Agent and Microsoft SQL Server shouldn't depend on a resource, other than specified resources. You are recommended not to make other database resources dependent upon MS SQL Server Agent or MS SQL Server. If it is essential to have dependency, you must play safely and follow the guidelines, recommended by Microsoft. The default resource dependency tree of MS SQL Server has the below implications:

The MS SQL Server Agent resources depend upon SQL Server resources...