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LUCENE Indexing.....
What is a Search Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Requirements of a Search Index ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Indexing Strategies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lucene Indexing Fundamentals ,[object Object],[object Object],[object Object],[object Object],[object Object]
Some Indexing Terms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Merge Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lucene Indexing Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Search Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A Lucene Segment <SegName, SegSize>  SegCount Version Name Counter SegCount Format
Per Index Files ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Per Segment Files ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
FileFormat (contd..) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Per Segment Files(prefix=segname) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Per Segment Files (contd..) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Segment layout T i+1 T j+k T j T i .tii file (in memory) .tis file (in disk) Random seeks Contiguous reads T q IndexDelta .frq/posting file (in disk) T q+1 Term DocFreq FreqDelta ProxDelta SkipDelta TF 1 TF d Posting-list(term-freqs) SD 1 SD d/sk SD 2 DocId FreqSk TF sk ProxSk .prx file Used to merge postings
Index Compression ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Search Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Vector Space Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Search Algorithm (contd.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Others.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Open ended questions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Lucece Indexing

  • 2.
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  • 10. A Lucene Segment <SegName, SegSize> SegCount Version Name Counter SegCount Format
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16. Segment layout T i+1 T j+k T j T i .tii file (in memory) .tis file (in disk) Random seeks Contiguous reads T q IndexDelta .frq/posting file (in disk) T q+1 Term DocFreq FreqDelta ProxDelta SkipDelta TF 1 TF d Posting-list(term-freqs) SD 1 SD d/sk SD 2 DocId FreqSk TF sk ProxSk .prx file Used to merge postings
  • 17.
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  • 22.