The technique used in locating and placing data in SQL Server Database is known as B-tree. A B-tree contains a tree-level page that maintains and stores a key value for each child page. In case, the child page is leaf-level page, then all records stored on the tree-level page should contain key values equal to or greater than the key value stored in parent page. However, in case the child page is tree-level page, then all records stored on the tree-level page should contain key value that is equal to the value stored in parent page. Corruption in B-tree results in changing the values of tree-level values, further resulting in the inaccessibility of database records. The best way to surmount any B-tree corruption scenario is by restoring the data from an updated backup. But, in case of absence of an updated backup, you will need to opt for an advanced sql database repair application that can repair your database and provide access to all inaccessible database components...

Are you facing assertion failure errors, while executing queries on MS SQL Server 2008 or 2005 databases? Does the query execution process fail halfway and you encounter errors? You may face the assertion failure problems due to either software bug or Master Database File (MDF) corruption. In both the cases, you can not access the database and come across data loss situations. In order to extract data in these circumstances, restore the database from backup. However, if the backup is unavailable, Master Database File Recovery becomes essential.

For example, the process may fail when you execute a distributed query, which uses linked server in MS SQL Server 2008 or in MS SQL Server 2005. Furthermore, you come across the below error message:

"OLE DB provider "SQLNCLI" for linked server "Linked Server" returned message "No transaction is active.". Msg 3624, Level 20, State 1, Line 1...

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:...

Using the indexes in SQL databases is a good practice as it makes searching the records faster and easier. The indexes consist of various pages that are arranged in the form of B-tree structures. When a query is executed, the database engine goes all way from the root node to the exact branch where the data is located. Any discrepancy in this routine may result in corruption of the database table. Such discrepancies can arise due to various reasons such as virus infections, hardware incompatibility, corrupt operating system, etc. You should use appropriate corrective measures to rectify the problem. However, if you are not able to resolve the issue then you should use a third-party mdf database repair software to repair SQL database table.

Consider a scenario wherein you face the following error message while working on the SQL Server 2000 database.

"Table error: Cross object linkage: Page P_ID1, slot S_ID1, in object ID O_ID1, index ID I_ID1 refers to page P_ID2, slot S_ID2, in object ID O_ID2, index ID I_ID2."...

It is always frustrating to view an error message while trying to mount your database. The error message not only results in unmountability of the database, but also in inaccessibility of database records. Such error messages can be caused due to database corruption. Few main reasons responsible database corruption are metadata structure damage, network issues, hardware malfunction, improper system shutdown, and virus infections. To overcome such error messages, the database administrator needs to run an inbuilt repair utility named 'DBCC CHECKDB'. While this command is competent enough to repair a damaged SQL Server 2000 database, it might also result in loss of data from the database. To prevent any such data loss situation from occuring, you will need to repair the database by using a powerful MDF Database Repair application.

To explain the above situation in detail, consider a real-time scenario where you encounter a severity level 16 error message while trying to mount your SQL Server 2000 database:...

A DBCC CHECKDB failure error message (severity level 16 or 10) appears when corruption in database is beyond the repair limits of the command. Such severe corruption MS SQL Server database is caused due to metadata structure corruption, hardware damage, application damage, and improper server shutdown. Since, the inbuilt repair command is unable to repair the corrupted database, the database remains unmountable and its records also remain inaccessible. To access the database records in such cases, the user needs to restore the database from an updated backup. However, in case of incomplete database backup, the user can use a third-party MDF Repair utility to repair the database.

To illustrate the above situation in detail, consider the below error message that appears when you run DBCC CHECKDB command to repair corrupted database:

“DBCC results for 'FVD_A'. Msg 2511, Level 16, State 1, Line 1...

MS SQL database corruption can result in serious damages, one of them being complete inaccessibility of all the records saved in database. To surpass any such corruption situation, a user can run DBCC CHECKDB command with a suitable repair clause. This command repairs the database in most situations by resolving all the physical and logical integrity issues. However, if the repair command displays an error message during repair, then it means that the database is beyond the repairing capabilities of DBCC CHECKDB command. In such cases, a database user can restore the database from an up-to-date backup and continue with his/her work. However, if the user has not maintained any database backup, then s/he needs to repair the database using a commercial MDF Database Recovery application.

Consider a practical case, where you encounter the below error message when you try to repair your corrupted MS SQL Server database using DBCC CHECKDB command:...

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...

A heap or clustered index in SQL Server is a way to effectively organize records saved in tables. These metadata structures enable the database user to increase retrieval speed of database records. While the heap index contains only the data pages, clustered index contains both index pages and data pages. Corruption in either of these indexes results in inaccessibility of all the database records. Few main reasons for index corruption are unexpected SQL Server shutdown, operating system malfunction, and virus attack. An easy way to surmount the problems created after index corruption is to restore the database from an updated backup. However, in case of database backup unavailability or backup falling short to restore the required data, the user needs to opt for an advanced third-party MDF Recovery application.

Consider a practical scenario, where you receive the below error message when your try to mount your database:...