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SQL Server error code

SQL Server error 7995

SQL Server raises error 7995 at severity 16, which marks a problem with the query or data that you can correct.

Database '%.*ls': consistency errors in system catalogs prevent further DBCC %ls processing.
Msg7995
NameDBCC2_SYSTEM_CATALOGS_CORRUPT
Severity16
Group7000–7999

What it means

The DBCC CHECKDB process consists of the following three stages:

Allocation checks. This is equivalent to running DBCC CHECKALLOC.

System tables consistency checks. This is equivalent to running DBCC CHECKTABLE on a small list of necessary system base tables.

Complete database consistency checks.

Source: Database Engine events and errors