Scenario: A DBA is optimizing a query in DB2 that involves multiple joins and subqueries. The query performance is slow. What strategies can the DBA employ to improve the query performance?

  • Implementing query parallelism
  • Increasing server memory allocation
  • Reorganizing tables and indexes
  • Using proper indexing techniques
Proper indexing techniques can significantly improve query performance in DB2. By analyzing the query execution plan and identifying the columns used for joins and filters, the DBA can create appropriate indexes to optimize data retrieval. 
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