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Yes, it is possible to add indexes or insert keys to a large DB2 table to enhance the speed of select queries. Indexes allow the database to quickly locate specific rows and columns, making queries faster. However, adding indexes can also slow down insert, update, and delete operations, so it is important to carefully consider the trade-offs between query performance and write performance. When adding indexes, it is also important to ensure that they are being used effectively by the queries being run against the table. Regular monitoring and maintenance can help to ensure that indexes continue to provide the desired benefits over time.