nocodb/packages/noco-docs/docs/100.data-sources/040.actions-on-data-sources.md

---
title: 'Actions on Data sources'
description: 'Learn more about actions that can be performed on data sources in NocoDB.'
tags: ['Data sources', 'UI ACL', 'Audit', 'Relations', 'Edit', 'Remove', 'Visibility']
keywords: ['NocoDB data source', 'UI ACL', 'Audit logs', 'Relations', 'Edit', 'Unlink', 'Visibility']
---

## Edit external database configuration parameters

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Click on `Edit` icon listed under `Actions` column for the data source that you wish to access ERD (Relations view) for
   Go to `Data Sources`, click ``Edit`` icon, you can re-configure database credentials.  
   Please make sure database configuration parameters are valid. Any incorrect parameters could lead to schema loss!

![relations](/img/v2/data-source/data-source-edit.png)

![edit db config](/img/v2/data-source/edit-base.png)

## Remove data source

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Click on `Delete` icon listed under `Actions` column for the data source that you wish to Unlink

![datasource unlink](/img/v2/data-source/data-source-unlink.png)

:::note
Unlinking a data source will not delete the external data source. It will only remove the data source from the current project.
:::


## Data source visibility

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Toggle radio button listed under `Visibility` column for the data source that you wish to hide/un-hide

![datasource visibility](/img/v2/data-source/data-source-visibility.png)


## UI Access Control

:::info
UI Access Control is available only in Open Source version of NocoDB.
:::

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Click on `UI ACL` button listed under `Actions` column for the data source that you wish to manage UI access control for
4. On the UI ACL modal, you can see the list of tables available in the data source as rows & roles available as columns. Toggle checkboxes to enable/disable access to tables for specific roles.
5. Click on `Save` button to save the changes


![ui acl](/img/v2/data-source/data-source-3.png)

![ui acl](/img/v2/data-source/ui-acl.png)


## Audit logs

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Click on `Audit` button listed under `Actions` column for the data source that you wish to access Audit logs for

![audit](/img/v2/data-source/audit.png)

![audit logs](/img/v2/data-source/audit-logs.png)


## Relations

1. Access Base context menu by clicking on the `Base` name in the left sidebar
2. Click on `Data Sources` tab
3. Click on `Relations` button listed under `Actions` column for the data source that you wish to access ERD (Relations view) for

![relations](/img/v2/data-source/data-source-4.png)

![relations](https://github.com/nocodb/nocodb/assets/86527202/c3775d27-f75d-4263-8903-dd66427de4b4)


### Junction table names within Relations

- Enable `Show M2M Tables` within `Project Settings` menu
- Double-click on `Show Fields` to see additional checkboxes get enabled.
    - Enabling which you should be able to see junction tables and their table names.

![image](/img/v2/data-source/junction-table.png)