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# FieldCheck

The `FieldCheck` option combines results based on the hash value of their `FieldCheckType` field. The `FieldCheckType` field holds a value that is frequently used to restrict results (for example, a field that stores category names). When IDOL Server indexes a `FieldCheckType` field, it stores it in a fast lookup table in memory, so that it can return quickly.

Related Topics

- FieldCheckType Fields

For example:

    http://IDOLhost:port/action=Query&Text=The best thing to do in your spare time&Combine=FieldCheck

In this example, IDOL Server is configured to store the `Category` field as a `FieldCheckType` field.

If IDOL Server contains 50 documents that match the query text, of which eight contain a `Category` field with the value `Sport`, five contain a `Category` field with the value `Gardening`, and one contains a `Category` field with the value `Cooking`, the above query returns only three results:

- the most relevant of the documents whose `Category` contains the value `Sport`.

- the most relevant of the documents whose `Category` contains the value `Gardening`.

- the document whose `Category` contains the value `Cooking`.

Note: If you set `URLAnalysis` to `True` in the `[Server]` section of the IDOL Server configuration file, you cannot identify a field as a `FieldCheckType` field, because IDOL Server automatically uses the domain of the URL it finds in the document `ReferenceType` fields as the `FieldCheck` value.

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