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SQL Server error code

SQL Server error 2575

SQL Server raises error 2575 at severity 16, which marks a problem with the query or data that you can correct.

The Index Allocation Map (IAM) page %S_PGID is pointed to by the next pointer of IAM page %S_PGID in object ID %d, index ID %d, partition ID %I64d, alloc unit ID %I64d (type %.*ls), but it was not detected in the scan.
Msg2575
NameDBCC_IAM_PAGE_WAS_NOT_SEEN
Severity16
Group2000–2999

What it means

An Index Allocation Map (IAM) page was found for the specified index; however, the IAM page for its next-page pointer was not found.

Source: Database Engine events and errors