To establish a connection with the OracleDB datasource, you can either click on the **+ Add new Data source** button located on the query panel or navigate to the **[Data sources](/docs/data-sources/overview)** page through the ToolJet dashboard.
ToolJet includes Oracle Instant Client versions 21.10 and 11.2. If you need to use a different client library version:
- For cloud deployments: You can add a custom client library to a directory of your choice or mount it as a volume in the container.
- For local setups: You can specify the path to your custom Oracle Client Library.
This allows ToolJet to locate and use the specific drivers for Oracle database connections.
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### Client Versions and Compatibility
ToolJet runs Oracle DB connections in thick mode. By default, ToolJet includes Oracle instant client versions 21.10 and 11.2. These client versions determine which Oracle Database versions you can connect to.
#### Available Client Versions
- Oracle Instant Client 21.10
- Oracle Instant Client 11.2
#### Compatibility
The instant client version affects which Oracle Database versions you can connect to:
- Oracle Instant Client 21.10 is compatible with Oracle Database 11.2 and later versions.
- Oracle Instant Client 11.2 is compatible with Oracle Database 10.2 and later versions.