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# DREDUPLICATE

Removes or tags duplicates after indexing.

This index action runs on a specified subset of the content, locating duplicates using a variety of methods. Any duplicates can then be deleted, moved to a different database, or tagged within a specified field, depending on the value of DuplicateAction that is chosen.

## Example

    http://12.3.4.56:20001/DREDUPLICATE?DuplicateAction=Delete&ReferenceField=*/DREREFERENCE

In this example, duplicates are identified using the `DREREFERENCE` field, and any duplicates found are deleted.

## Parameters

Parameter | Description | Required
--- | --- | ---
ChecksumField | A reference field used to determine whether a match is exact. |
Database | The database to move duplicates to. | see Comments
DatabaseMatch | A list of databases to search for duplicates in. |
DuplicateAction | The action to perform on duplicates. | Yes
MaxID | The last DocID to find duplicates of. |
MinID | The first DocID to find duplicates of. |
ReferenceField | A reference field to use as the initial determination of whether two documents are a match. | Yes
TagField | The field to tag duplicates with. | see Comments
TagValue | The static value to tag duplicates with in the TagField. |
ThreadHashField | The field containing the thread hash values used to determine whether a match is a duplicate. |

This index action accepts the following standard index action parameters.

Parameter | Description
--- | ---
IgnoreMaxPendingItems | Whether to ignore the IndexQueueMaxPendingItems limit for this index action.
IndexUID | An identification code for any document tracking events.
NoArchive | Turn off configured archiving for the index action.
Priority | The priority for the index job.

## Comments

- You must set Database when DuplicateAction is set to `Database`.

- You must set TagField when DuplicateAction is set to `Tag`.

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