# KillDuplicatesChecksumField

The name of a checksum field to evaluate duplicate documents. If you have set KillDuplicates to `REFERENCE` or a `FieldName`, and a new document that IDOL Server receives has the same value in the `DREREFERENCE` field or the `FieldName` Reference field as a document that already exists in IDOL Server, IDOL Server normally replaces the existing document with the new document.

If you specify a `KillDuplicatesChecksumField` Reference field, IDOL Server goes on to check the value of this field in both documents. If the value is the same, IDOL Server keeps the existing document rather than replacing it with the new document.

NOTE: The field that you define in this parameter must be configured with the ReferenceType property.

Type: | String
Default: |
Required: | No
Configuration Section: | Server
Example: | `KillDuplicatesChecksumField=*/REFFIELD`
See Also: | KillDuplicates ReferenceType

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