> For the complete documentation index, see [llms.txt](https://v2.dataos.info/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://v2.dataos.info/concepts/resources/depot/supported-table-format/delta.md).

# Delta

In DataOS, object storage Depots (ABFSS, Amazon S3, GCS) support two table formats: `iceberg` and `delta`. This section covers the Delta table format.

### What does the Delta table format actually do? <a href="#what-does-the-delta-table-format-actually-do" id="what-does-the-delta-table-format-actually-do"></a>

Delta table format adds a transactional metadata layer to cloud object storage, providing ACID-compliant operations on Parquet files. In DataOS, setting `format: delta` on a Depot routes ingestion through Delta-compatible read and write Flare jobs.

**In DataOS:**

* Set `format: delta` on a Depot for Delta table format (best with Spark).
* Set `format: iceberg` on a Depot for Iceberg table format (works with Spark, Trino, and more).

### Supported object storage sources in DataOS for Delta table format <a href="#supported-object-storage-sources-in-dataos-for-delta-table-format" id="supported-object-storage-sources-in-dataos-for-delta-table-format"></a>

DataOS supports the Delta table format on the following object storage Depots:

* [ABFSS](/concepts/resources/depot/supported-sources/abfss.md)
* [Amazon S3](/concepts/resources/depot/supported-sources/s3.md)
* [GCS](/concepts/resources/depot/supported-sources/gcs.md)

For each of these storage types, create a Depot with `format: delta` to use Delta table management in DataOS.


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