# Databricks Change Data Feed

CDF shows the row-level changes between versions of a Delta table. The changes displayed include row data and metadata that indicates whether the row was inserted, deleted, or updated.

Immuta does not support applying policies to the changed data, and the CDF cannot be read for data source tables if the user does not have access to the raw data in Databricks. However, the CDF can be read if the querying user is allowed to read the raw data and one of the following statements is true:

* the table is in the current workspace,
* the table is in a scratch path,
* non-Immuta reads are enabled AND the table does not intersect with a workspace under which the current user is not acting, or
* non-Immuta reads are enabled AND the table is not part of an Immuta data source.

## Configure Change Data Feed

There are no configuration changes necessary to use this feature.

## Limitation

Immuta does not support reading changes in [streaming queries](https://docs.databricks.com/delta/delta-change-data-feed.html#read-changes-in-streaming-queries).


---

# 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://documentation.immuta.com/2024.2/data-and-integrations/databricks-spark/reference-guides/change-data-feed.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.