One particularly helpful tool when working with a hierarchical DBMS is IBM Db2 with its Tree Structures Feature. It simplifies querying hierarchical data by using parent-child relationships, allowing me to efficiently retrieve and manipulate data with minimal complexity. A technique that improved my workflow was leveraging recursive SQL queries. For instance, when managing an employee organizational chart, I used recursive queries to retrieve all subordinates under a specific manager dynamically. This eliminated the need for cumbersome manual traversals and reduced query execution time significantly. By combining this tool with recursive techniques, I improved efficiency in managing hierarchical datasets, allowing for faster reporting and more streamlined operations.