Grant the necessary privileges to the user. For example, to grant SELECT privilege on a table:
GRANT SELECT ON table_name TO username;
Assign the appropriate roles that include the necessary privileges. For example, to grant the DBA role:
GRANT DBA TO username;
Ensure the user owns the schema or has the necessary privileges to access it. You can check the owner of the schema and assign privileges accordingly:
GRANT ALL ON schema_name.* TO username;
Verify if any privileges were revoked and restore them if necessary:
REVOKE ALL ON table_name FROM username; GRANT ALL ON table_name TO username;
A user tries to execute a SELECT statement on a table they do not have access to:
SELECT * FROM employees;
To fix this, grant the SELECT privilege:
GRANT SELECT ON employees TO username;
A user tries to perform administrative tasks without having the DBA role:
CREATE TABLESPACE new_space DATAFILE 'new_space.dbf' SIZE 10M;
To fix this, grant the DBA role:
A user tries to modify a schema they do not own:
ALTER TABLE other_schema.table_name ADD (column_name VARCHAR2(100));
To fix this, grant the necessary privileges:
GRANT ALL ON other_schema.table_name TO username;