User has deleted the important information like SQL Server configuration, user logins, linked servers, and user objects.

There can be other reasons as well apart from corruption to rebuild the SQL Master Database such as – The end results for these kinds of symptoms are the Master Database has been corrupted and needs to be rebuilt. SQL administrators can identify their Master Database is no longer healthy if it has become inaccessible with input or output errors, power failures, or the report is generated with Database Consistency Checker Utility. Loss of any important data from Master database like parallel transaction logs, users and their login details, pointers information can impact the smooth working in SQL Server. However, this importance of backup is neglected knowingly or unknowingly by the administrators.

So, this information must be preserved by having backups regularly. The Master database in SQL Server stores all the crucial information like configuration details in a file (.MDF file). In SQL Server, administrators depend on the healthy master database to work uninterruptly.

Master db corrupt sql server