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# Configure IDOL Server to Enable Dynamic Clusters

Use the following procedure to enable dynamic clustering in IDOL Server.

To configure IDOL Server to enable dynamic clustering

1. Open the IDOL Server configuration file in a text editor.

2. In the `[Server]` section, set the following parameters:

   `QuerySummaryAdvanced` | Set this parameter to `True` to enable the advanced algorithm that provides dynamic clustering. This algorithm clusters the best terms and phrases from the query results, and lists them. The default value is `False`.
   `QuerySummaryLength` | Set this parameter to the number of cluster phrases to generate. Setting `QuerySummaryLength` too high can slow the query performance (a sensible value might be 25–250). The default value is `10`.
   `QuerySummaryIDs` | Set this parameter to `True` to return the document IDs of the parent documents that phrases come from. The IDs return in the list that IDOL Server generates when you perform an action with the `QuerySummary` parameter. You can use the IDs to display the number of documents that each dynamic cluster contains. The default value is `False`.
   `QuerySummaryTerms` | Specify the number of terms that the algorithm for `QuerySummaryLength` can use to generate the query summaries (a sensible value might be 50–500). If you set this parameter to `0`, IDOL Server uses the specified `TermsPerDoc` number, which in turn defaults to `50`. The default value is `0`.

   Tip: You can also set these parameters in the `Query` action so that you can test different values without reconfiguring IDOL Server, or tune `QuerySummary` functionality for different uses.

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