What factors should be considered when determining the columns to include in an index?

  • Data Distribution, Data Length, and Query Complexity
  • Data Types, Column Order, and Nullability
  • Primary Key Status, Foreign Key References, and Unique Constraints
  • Selectivity, Cardinality, and Query Patterns
When deciding which columns to include in an index in DB2, several factors must be considered. These include selectivity (the uniqueness of values), cardinality (the number of distinct values), and query patterns (frequently used queries). By understanding these factors, you can design indexes that optimize query performance by efficiently retrieving data based on the specific needs of the application. 
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