IDOL Community Component 12.13

# Deduplication Constraints

There are some constraints on deduplication when using other IDOL parameters.

## Use the Combine Operation

The IDOL Content component cannot use the same `ReferenceType` field for deduplication as it uses for the `Combine` action parameter. The `Combine` operation occurs at query time and clashes with deduplication. If you intend to deduplicate when indexing and use the `Combine` action parameter, you must set up separate `ReferenceType` fields for these processes.

Related Topics

- Use KillDuplicates and Combine on ReferenceType Fields

## Use Deduplication with DIH Reference-Based Indexing

You can enable the DIH for reference-based indexing. Refer to the DIH Administration Guide.

If you index documents into IDOL with the DIH enabled for reference-based indexing, it might prevent deduplication of documents with different references. In this case, use only one of the following deduplication options:

- `KillDuplicates=REFERENCE`

- `KillDuplicates=NONE`

## Use Deduplication with DIH Field-Based Indexing

You can use field-based indexing in the DIH to ensure correct deduplication in a distributed system. For more information on configuring the DIH for field-based indexing, refer to the DIH Administration Guide.

If you set `KeepExisting` to `False`, or use `KillDuplicatesDB` options, it might prevent correct deduplication. To deduplicate correctly, you can distribute data by the `DeDupeHash` field (MD5 hash) of the documents. In this way, DIH sends all duplicates to the same child server. Setting `KillDuplicates` to `DeDupeHash` during the indexing action then ensures accurate deduplication.

To use a field for deduplication, you must configure it as a `ReferenceType` field. You do not need to configure it as `ReferenceType` in the DIH configuration file.

Deduplication of content occurs for all reference fields specified in a single `PropertyFieldCSVs` list in the IDOL Content component configuration file. To use only the `DeDupeHash` field to deduplicate, and not also the `DREREFERENCE`, you must set these reference fields in separate field processing sections in the IDOL Content component configuration file.

© Copyright 2022 Micro Focus or one of its affiliates
Version 12.13 | Last updated October 2022

Send documentation feedback

Close

Send documentation feedback

To send feedback using your default email client, open an email window.

Otherwise, send your feedback and the information below to swpdl.idoldocsfeedback@microfocus.com.

We appreciate your feedback!

Product: IDOL IDOL Community Component 12.13

Topic Title: Deduplication Constraints