How does DB2 handle indexes on columns with high cardinality?

  • Automatically updates index statistics
  • Optimizes access paths
  • Prioritizes index rebuilding
  • Utilizes compression techniques
DB2 optimizes access paths for columns with high cardinality by efficiently utilizing indexes. It leverages index statistics to determine the most efficient access paths for queries, ensuring optimal performance. This involves strategies such as index selection, index scanning, and index-only access to minimize I/O operations and improve query execution time. 
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