A SQL Server database that suddenly becomes inaccessible can create a serious problem for a database administrator. Applications may fail, queries may return errors, and SQL Server may report consistency issues that were not visible during normal operation.

The first instinct is often to repair the database immediately. However, the safest recovery approach starts with identifying the problem, protecting the available data, and understanding the reported errors before making changes.

This guide walks through a practical process for diagnosing SQL Server database corruption and deciding what to do next.

1. What does SQL Server database corruption mean?

SQL Server stores database information in data files, typically with .mdf and .ndf extensions, while transaction log information is stored in .ldf files.

Database corruption occurs when stored database structures or their contents become inconsistent or damaged.…