How to solve "Attempt to fetch logical page %S_PGID in database %d failed. It belongs to allocation unit %I64d not to %I64d." in SQL Server?

This error message indicates that you are attempting to fetch a logical page in SQL Server, but the page does not belong to the expected allocation unit.

When data is stored in SQL Server, it is organized into pages, which are allocated to allocation units such as tables, indexes, or partitions. Each page has a unique page ID, which identifies its location in the database.

This error can occur due to several reasons, such as:

Data corruption: If the page has become corrupted, it can cause the error message to appear.
Hardware failure: If there is a problem with the storage hardware, it can cause the error message to appear.
Incorrect allocation unit: If the page belongs to a different allocation unit than expected, it can cause the error message to appear.

To resolve this issue, you can try one or more of the following solutions:

Check for data corruption: Run DBCC CHECKDB to check for data corruption in the database.
Check for hardware failures: Check the storage hardware for any issues, such as disk failures or network connectivity problems.
Restore from backup: If data corruption is found, restore the database from a backup taken before the corruption occurred.
Run repair command: If data corruption cannot be resolved with a restore, run the DBCC CHECKDB with the REPAIR_ALLOW_DATA_LOSS option to attempt to repair the corruption.
Check allocation units: Check the allocation units of the table or index to ensure they are correct. If they are incorrect, try rebuilding or reorganizing the affected object.

By implementing one or more of these solutions, you should be able to resolve the issue and fetch the logical page successfully.

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