ClickHouse is a fast open-source column-oriented database management system developed by Yandex for online analytical processing (OLAP). It is designed to handle large volumes of data and perform complex queries with high efficiency. ClickHouse is widely used for real-time analytics and is known for its speed and scalability.
When working with ClickHouse, you might encounter the error message: DB::Exception: Code: 1035, e.displayText() = DB::Exception: Cannot remove role. This error indicates that there is an issue with removing a role from the system.
The error code 1035 in ClickHouse is associated with role management issues. Specifically, this error occurs when the system is unable to remove a specified role. This could be due to syntax errors in the command used to remove the role or insufficient permissions for the user attempting the operation.
To resolve the issue of being unable to remove a role in ClickHouse, follow these steps:
Ensure that the syntax used for removing the role is correct. The basic command to remove a role is:
DROP ROLE [IF EXISTS] role_name;
Make sure to replace role_name with the actual name of the role you wish to remove. The IF EXISTS clause is optional but can prevent errors if the role does not exist.
Ensure that you have the necessary permissions to remove the role. You need to have the ACCESS MANAGEMENT privilege. You can check your current privileges with the following query:
SHOW GRANTS;
If you do not have the required permissions, contact your database administrator to grant you the necessary access.
Ensure that the role is not assigned to any users or involved in any dependencies that prevent its removal. You can list users assigned to a role with:
SHOW USERS;
If the role is assigned, you may need to reassign or remove it from users before proceeding.
For more information on managing roles in ClickHouse, refer to the official documentation:
By following these steps, you should be able to resolve the error and successfully manage roles within your ClickHouse environment.
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