> For the complete documentation index, see [llms.txt](https://docs.selectstar.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.selectstar.com/integrations/bigquery/bigquery-description-sync.md).

# BigQuery Description Sync (beta)

You have the option of syncing descriptions created in Select Star back to BigQuery. This beta feature allows you to push back descriptions for schemas, tables, and columns to your original BigQuery data source.

{% hint style="info" %}
This feature is currently in beta and only available for BigQuery data sources.
{% endhint %}

## Enable BigQuery Description Sync in Select Star

To try out this feature while it is in beta, contact Select Star support.

{% hint style="info" %}
The service account you created for Select Star must have the necessary permissions to update BigQuery metadata. Ensure your service account has the `bigquery.tables.update` and `bigquery.datasets.update` permissions.

To grant these permissions, assign the appropriate IAM roles to your service account in the Google Cloud Console. You can do this by navigating to **IAM & Admin > IAM**, finding your service account, and editing its permissions. For more details, see the [Google Cloud documentation on granting roles and permissions](https://cloud.google.com/iam/docs/granting-changing-revoking-access).
{% endhint %}

## How Description Sync Works

When Description Sync is enabled:

* Descriptions added to schemas, tables, and columns in Select Star will be synced back to BigQuery. This sync is performed automatically, once every day.
* The Descriptions added by users are synced back. Descriptions from other sources (e.g. AI generated, or propagated from other objects) are only synced back if they are explicitly selected as the description for the object.
* The sync process updates the metadata descriptions in your BigQuery data source and the changes are reflected in BigQuery's information schema and console interface.
* Changes to descriptions in BigQuery will still be reflected in Select Star.


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