Pages in metadata structure of MS SQL Server database are either linked in a B-tree or heap tree format. These pages contain the records of different database components. In such situations, these pages instead of pointing the required pages, start pointing to a wrong page. The database records become inaccessible in case the SQL database gets corrupted or damaged. To access the records saved in the database components, an easy way is to restore the database objects from an updated backup. But, if in case the backup is not available, or backup file is not created, then you will need to repair the SQL database to access all its records. To do so, you will need to use advanced third-party SQL Recovery utility.

To briefly explain the above database corruption scenario, below is the error message that pops up when a SQL database table gets corrupted:

“Table error: Cross object linkage: Parent page P_ID1, slot S_ID1 in object ID O_ID1, index ID I_ID1, and page P_ID2, slot S_ID2 in object ID O_ID2, index ID I_ID2, next refer to page P_ID3 but are not in the same object.”...

A table in MS SQL database can be corrupted due to various reasons. One of the most common being the corruption in metadata structure, caused due to damage of SQL Server damage. Once the table gets corrupted, it fails to display records stored in it. Furthermore, you also receive an "Table Error" message that does not allow you add any new records. An easy way to overcome such hazards is by restoring the table from an updated backup. But, with probabilities of backup file being corrupted, not updated, or inaccessible always exist. In such situations, the database user is left with no option, but to repair the corrupted table. To effectively do so, the user need to search for an advanced SQL Recovery application.

To illustrate the above case, below is a Table error message that appears after your SQL database table gets corrupted:

"Table error: Object ID O_ID, index ID I_ID, page P_ID. Test (TEST) failed. Slot S_ID, offset 0xADDRESS is invalid."...

Corruption of MS SQL database can result into damage of metadata structure entries, which can further result into inaccessibility of records saved in the SQL database components. In most cases of metadata structure damage, you receive an error message that specifies the exact metadata entry, which is corrupt. To overcome the error message and to access the database components records, an ideal way is to restore it from an updated backup. However, there are thousand of situations, where either the backup gets corrupted or the database administrator forgets to create a backup. In such cases, the only way to access records of a corrupted SQL database component is by repairing it with a powerful third-party MS Recover SQL application.

Consider a practical case, where you receive the below error message while trying to access a SQL database table:

“Table error: Object ID O_ID, index ID I_ID B-tree level mismatch, page P_ID1. Level LEVEL1 does not match level LEVEL2 from parent P_ID2.”...

A PFS (Page Free Space) page tracks the allocation status for every page and the amount of free space available on the page. The database engine uses the information stored in the PFS pages to allocate new pages. The page stores the information in the form of bytes, including a byte that indicates that the page is a mixed page. An IAM (Index Allocation Map) page, on the other hand is an array that stores all the mixed pages assigned to a particular index. The data stored in the database components becomes inaccessible if the page that is assigned a 'mixed page' byte in PFS page, not the same page does appear in the IAM page's array. This primarily occurs due to SQL database corruption. In such cases, the database becomes unmountable, further resulting into inaccessibility of its records. For complete accessibility of records in such situations, you will need to restore the data from an updated backup. But, if backup is not available, then you will need to use advanced MS SQL Recovery application...

The logical and physical integrity of all SQL Server database tables is performed by DBCC CHECKDB command. The command performs and divides its operations in three different phases. The first phase checks the consistency of the allocation structures in disk space, the second phase checks the integrity of all pages and their structures, and the last phase checks the catalog consistency. If critical errors are found in any of the phases, the DBCC CHECKDB command terminates immediately. This happens when the SQL Server database is badly corrupted, and is beyond the repairing capabilities of DBCC CHECKDB command. In such cases, if you need to access the database records, then you will need to restore the database records from a valid backup. But, if no backup is available or backup falls short to restore the required amount of data, then you will need to repair the database by using advanced MS SQL Server Recovery application...