Trino is a powerful, open-source distributed SQL query engine designed for running interactive analytic queries against data sources of all sizes. It is particularly useful for querying large datasets across multiple data sources, making it a popular choice for data engineers and analysts. One of the key features of Trino is its role-based access control, which allows administrators to manage permissions and access to data effectively.
When working with Trino, you might encounter an error message stating INVALID_ROLE. This error typically occurs when you attempt to assign a role to a user or use a role in a query, and the specified role is not recognized by the system. This can disrupt workflows and prevent users from accessing necessary data.
The INVALID_ROLE error indicates that the role you are trying to use does not exist in the Trino system. This could be due to a typo in the role name, an attempt to use a role that has not been created, or a misunderstanding of the available roles within your Trino setup. Understanding the role management system in Trino is crucial for resolving this issue.
To resolve the INVALID_ROLE error, follow these steps:
Ensure that the role name you are using is spelled correctly. Double-check for any typographical errors that might be causing the system to not recognize the role.
Use the following SQL query to list all roles available in your Trino system:
SHOW ROLES;
This command will display a list of all roles that have been created. Verify that the role you are trying to use is listed.
If the role does not exist, you will need to create it. Use the following command to create a new role:
CREATE ROLE role_name;
Replace role_name with the desired role name. Ensure that the role is created with the necessary permissions.
Once the role is verified or created, assign it to the necessary users using the following command:
GRANT role_name TO USER user_name;
Replace role_name with the role and user_name with the user's name.
For more information on role management in Trino, refer to the official Trino Documentation on Roles. Additionally, the Security Overview provides insights into managing access and permissions effectively.
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