Knowledge Discovery 25.1
Knowledge Discovery Expert

# Storage of Document Content

See Also: Disk Usage in the Content component

You can reduce the amount of storage space that the Content component requires by not storing the majority of the document content in Content. Some functionality is unavailable for non-stored content, but in some cases there are alternative methods that you can use.

There are two methods you can use in Content to disable storage of document content:

- `MustHaveCSVs` and `CantHaveFieldCSVs`. This method removes fields before the server processes them at all.

- `NodetableStoreContent` and `StoredType`. In this method, Content processes the fields as normal, but does not store the content. In particular, the `DRECONTENT` field is usually the largest index field, and it should be processed for terms but not always stored.

The following article describes the functionality that is restricted when you do not store document content.

## Summarization

You cannot use any of the query time summary options for fields that are not stored (the `Summary` parameter for the query actions, set to `Context`, `Concept`, and so on).

As an alternative to query time summarization, you can generate a quick summary as part of the ingest process, and store it in a stored field so that is available in queries.

If the text from the original document is available, then you can use the `Summarize` action.

## Highlight

You cannot use any of the query time highlight options for fields that are not stored (the `Highlight` parameter for the query actions, set to `Term`, `SummaryTerms`, and so on).

You can send the text from the original document by using the `Highlight` action (with or without the `TextParse` parameter depending on if you have the text or the IDX/XML available elsewhere).

You can also use the View component `View` action for highlighting the original data file formats.

## AdvancedSuggest

You cannot use the `AdvancedSuggest` configuration option if you do not store the source fields.

## Query Summary

The `QuerySummary` options do not generally give good results (or might not function at all) if you do not store the source fields (the `DRECONTENT` field is usually a source field).

## DREREPLACE

A `DREREPLACE` index action to replace an index field causes an internal reindex of the document, which might mean that data is lost from the document.

You can still use `DREREPLACE` to add or remove values from optimized fields (MatchType, NumericType, and NumericDateType). For example, you can use `DREDELETEFIELDVALUE`/`DREFIELDVALUE` on `NumericType` fields and the corresponding search operators respect the changes. You cannot use `DREREPLACE` to add or remove values from non-stored ParametricType fields.

NOTE: Replacing on an optimized field assumes that a value can appear only once in a document.

TIP: As an alternative to the `DREREPLACE` index action, you can also use the wizard on the Replace tab on the Console page in the Control section of Knowledge Discovery Admin to change field values or delete fields from indexed documents.

## DREEXPORTIDX and DREEXPORTXML

The `DREEXPORT` index actions export only the data that is stored.

## FieldText

Optimized `FieldText` operations on optimized field types work as normal. However, other field operations do not work.

You can use the `EQUAL` operator on a `NumericType` field, but you cannot use `MATCH` on a `NumericType` field. Similarly, you can use `MATCH` on a `MatchType` field, but not `EQUAL`.

## Sort

You can only perform `Sort` operations on optimized field types.

Copyright 2024 Open Text
Version 25.1 | Last updated January 2025

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Product: Knowledge Discovery 25.1

Topic Title: Storage of Document Content