PostgresDB 0L000: Invalid Grantor

What is PostgresDB 0L000: Invalid Grantor

When encountering the error 0L000: Invalid Grantor in PostgreSQL, the user should take the following actions immediately:

Check the Current User's Role and Privileges: Determine if the current user has the necessary role and privileges to perform the operation that led to the error.SELECT rolname, rolsuper, rolcreaterole, rolcreatedb, rolcanlogin FROM pg_roles WHERE rolname = current_user;Identify the Grantor of the Problematic Permissions: Investigate who granted the permissions that are now causing the issue, which might help in understanding why the grantor is considered invalid.SELECT grantor, grantee, privilege_type FROM information_schema.role_table_grants WHERE table_name='your_table_name';SELECT grantor, grantee, privilege_type FROM information_schema.role_usage_grants WHERE object_name='your_object_name';Replace 'your_table_name' and 'your_object_name' with the names of the specific table or object you were trying to access or modify.Review Ownership of the Affected Database Objects: The error could be due to ownership issues. Check who owns the table or database object you are interacting with.SELECT table_name, table_owner FROM information_schema.tables WHERE table_name='your_table_name';Or for other objects,SELECT oid::regclass::text, relowner FROM pg_class WHERE oid::regclass::text = 'your_object_name';Again, replace 'your_table_name' and 'your_object_name' with the appropriate names.Attempt to Reassign Ownership (If Appropriate and Possible): If you have sufficient privileges, you may try reassigning the ownership of the object to a valid role, especially if the current owner is no longer valid or has been dropped.ALTER TABLE your_table_name OWNER TO new_owner;Replace your_table_name with the name of your table and new_owner with the name of the new owner role.

Note: These actions are direct responses to investigate and potentially resolve the Invalid Grantor error. However, exercise caution, especially when changing ownerships or permissions, and ensure you have the right to perform these operations. If unsure, consulting with a more experienced database professional is advisable even in the absence of a designated database administrator.