Scenario: An application running on DB2 is experiencing slow query execution. What strategies can be employed to improve its performance?

Option 3, implementing proper indexing, involves identifying and creating appropriate indexes on tables to speed up query execution by enabling the database engine to retrieve data more efficiently. This can significantly improve performance for slow-running queries by reducing the need for full table scans or excessive data sorting. Other options, such as rewriting SQL queries (option 1) to optimize their structure, increasing buffer pool size (option 2) to enhance memory management, and partitioning large tables (option 4) to distribute data across multiple physical storage units, are also valid strategies for improving performance. However, proper indexing is typically the most direct and effective approach for addressing slow query execution issues.