SQL Server error code
SQL Server error 666
SQL Server raises error 666 at severity 16, which marks a problem with the query or data that you can correct.
The maximum system-generated unique value for a duplicate group was exceeded for index with partition ID %I64d. Dropping and re-creating the index may resolve this; otherwise, use another clustering key.
| Msg | 666 |
|---|---|
| Severity | 16 |
| Group | 0–999 |