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67 lines
2.4 KiB
67 lines
2.4 KiB
1 year ago
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---
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1 year ago
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title: 'Data Sources overview'
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1 year ago
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description: 'NocoDB Data-Source sync, access control & re-config'
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---
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## Overview
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`Data Sources` tab includes following functionalities
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- Connect/manage external data source
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- UI Access Control
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- Relations
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Note that, currently only one external data source can be added per project.
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## Accessing Data Sources
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Click `Data Sources` tab in `Project dashboard`
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## Sync Metadata
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Go to `Data Sources`, click ``Sync Metadata``, you can see your metadata sync status. If it is out of sync, you can sync the schema. See [Sync Schema](/setup-and-usages/sync-schema) for more.
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## UI Access Control
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Go to `Data Sources`, click ``UI ACL``, you can control the access to each table by roles.
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## Relations
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Go to `Data Sources`, click ``Relations``, you can see the ERD of your database.
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### Junction table names within Relations
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- Enable `Show M2M Tables` within `Project Settings` menu
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- Double click on `Show Columns` to see additional checkboxes get enabled.
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- Enabling which you should be able to see junction tables and their table names.
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## Edit external database configuration parameters
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Go to `Data Sources`, click ``Edit`` icon, you can re-configure database credentials.
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Please make sure database configuration parameters are valid. Any incorrect parameters could lead to schema loss!
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## Unlink data source
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Go to `Data Sources`, click ``Delete`` against the data source that you wish to un-link.
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## Data source visibility
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Go to `Data Sources`, toggle ``Radio-button`` against the data source that you wish to hide/un-hide.
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