> ## Documentation Index
> Fetch the complete documentation index at: https://docs.activeviam.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction to the Data Extraction Engine

> The Data Extraction Engine (DEE) in Atoti Server, a REST-based extension for extracting query results to CSV or in-memory sinks, covering supported extraction queries and output types.

DEE exposes an asynchronous REST API for extracting query results, with requests submitted as Orders to a configured data sink.

The DEE exposes an asynchronous REST API to extract query results in CSV files.
Requests to the API are called [Orders](./user-guide/dee-orders).
The target location the data is extracted to is known as a data sink.

## Supported queries

DEE supports the following Extraction Queries:

* [Drillthrough Query](./user-guide/dee-order-structure/queries/drillthroughQuery)
* [GetAggregatesQuery](./user-guide/dee-order-structure/queries/getAggregatesQuery)
* [MDX](./user-guide/dee-order-structure/queries/mdxDrillthroughQuery)
* [SearchFactsQuery (Datastore query)](./user-guide/dee-order-structure/queries/searchFactsQuery)

## Supported outputs

DEE supports the following outputs:

* CSV (Local FileSystem)
* InMemory (Extraction only)