Lucece 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]

Lucece Indexing

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