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Inverted index

  • We need variable-size postings lists

    • On disk, a continuous run of postings is normal and best

    • In memory, can use linked lists or variable length arrays

      • Some tradeoffs in size/ease of insertion                         Posting(below)

Brutus124113145 173 174 
Caesar 124 5 616 57 32
Calpurnia 23154 101 



Brutus , Caeser and Calpurnia are dictionaries.

Numbers are postings.

Sorted by docID (more later on why).

Speaker notes:

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