lothar at mountproc
Nov 18, 2007, 7:15 AM
Views: 351
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Estimate index filesystem requirements
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Hi,
I'm wondering if there is a kind of "formule" to estimate the size of a
lucene index. Searching the list, I did not find any pointers.
Does anybody has a hint?
What I figured out from the file format description and some empirical
tests is, that for every index-file:
Field-files:
field-data .fdt: NumberOfDocs * NumberOfFieldsPerDoc
field-index .fdx: NumberOfDocs * 8
field-info .fnm: ignored
Term-Files:
term-data .tis: NumberOfTerms * 8
term-index .tii: no idea so far
term-freq: .frq: estimated as NumberOfDocs * NumberOfTerms
Normalization:
Norm file: .nrm: NumberOfDocs
This concerns only Un-stored fields of course.
I estimate the total NumberOfTerms of my document collection with 10% of
the NumberOfDocuments. Does someone has similiar experience?
lofi
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Estimate index filesystem requirements