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Last lecture – index construction

  • Sort-based indexing 
    • Naïve in-memory inversion 
    • Blocked Sort-Based Indexing
      • Merge sort is effective for disk-based sorting (avoid seeks!)
  • Single-Pass In-Memory Indexing
    • No global dictionary
      • Generate separate dictionary for each block
    • Don’t sort postings
      • Accumulate postings in postings lists as they occur
  • Distributed indexing using MapReduce
  • Dynamic indexing: Multiple indices, logarithmic merge

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