Oracle Compressed Indexes

Key compressed indexes are a way to index a low cardinality column without talking up as much space storing the repetitive values. Please view the Oracle Manuals for a full description on implementing compressed indexes.



  • Fewer index leaf blocks need to be read since more rows fit into fewer blocks
  • Insert statements are faster since fewer leaf blocks need to be read to determine where the new row is inserted
  • Faster full index scans due to fewer leaf blocks
  • Space savings




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