# Preview sample data

{% hint style="info" %}
The Preview feature is **opt-in** because displaying sample data egresses data from your table. Decube **does not cache sample data** from this preview.
{% endhint %}

To view sample data for a specific table, go to the table in the Catalog and open the **Preview** tab.

The platform displays 10 rows of sample data from your table. Any columns marked as *PII* or *Sensitive* in the [Schema tab](/catalog/add-tags-and-classifications-to-fields.md) are automatically masked, preventing sensitive data from being exposed to other organization members.

To run the preview, select **Accept** under the disclaimer.

{% hint style="info" %}
To run the preview, you will need access to "Allow run preview" for the data source selected. [Learn about source-based policies.](/group-access-policies/source-based-policies.md)
{% endhint %}

<figure><img src="/files/emH6C1qOBNqhuFBpOmWA" alt=""><figcaption><p>Example of sample data that is displayed.</p></figcaption></figure>


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.decube.io/catalog/preview-sample-data.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.