Content Component 25.4
Content Component Help

# Locate Duplicate Documents

You can locate duplicate documents in the data index after indexing has taken place by using the DREDUPLICATE index action. This action locates duplicates in a specified subset of the content, and then removes them, tags a field, or moves the duplicate documents to another database.

    http://ContentHost:indexPort/DREDUPLICATE?ReferenceField=Field&DuplicateAction=Action

where:

`ContentHost` | is the IP address or host name of the machine on which the Content component is installed.
`indexPort` | is the Content component index port (specified as IndexPort in the `[Server]` section of the Content component configuration file).
`Field` | is a ReferenceType field used as the initial determination of whether two documents are a match.
`Action` | is the action to perform on a duplicate. The following options are available: `Delete`. Deletes all duplicate documents. `Database`. Moves all duplicate documents to a database. If you select the `Database` action, you must specify the database in the Database parameter. `Tag`. Tags a specified field in the duplicate document. You must specify the field in the `TagField` index parameter. You can also specify a value to tag the field with by using the `TagValue` parameter. If you do not specify a `TagValue`, the field is tagged with the value `1`.

For example:

    http://MyHost:20001/DREDUPLICATE?ReferenceField=DOCUMENT/DREREFERENCE&DuplicateAction=Database&Database=Duplicates

This action uses port `20001` to remove duplicates from the Content component that is located on the machine with the host name `MyHost`. Content uses the `DREREFERENCE` field to identify duplicate documents, and moves them to the `Duplicates` database.

    http://MyHost:20001/DREDUPLICATE?ReferenceField=DOCUMENT/DREREFERENCE&DuplicateAction=Tag&TagField=DOCUMENT/DRETITLE&TagValue=Duplicate

In this example, Content initially uses the `DREREFERENCE` field to identify the duplicate documents, and then it changes the `DRETITLE` field to the value `Duplicate`.

To prevent Content from indexing duplicate documents, use the KillDuplicates parameter with the DREADD and DREADDDATA index actions.

For details on the other parameters that are available for the DREDUPLICATE index action, refer to the Content component Reference.

Related Topics

- Display Online Help

- Prevent Duplicate Documents

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Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery Content Component 25.4

Topic Title: Locate Duplicate Documents