Hi,
We have a single Lucene index consist of 4.5 million document with 20
million different term.
The lookup time is too high , (more than 3 seconds) for a none-simple
boolean query, this high lookup time is not acceptable.

We did a simple test to figure out the relation between ( documents count &
lookup time ) and the results was amazing.
note :  queries and documents are generated randomly

Doc count  /  lookup time  for 1000 multi term query ( in milliseconds )
5000        /   1683
10000      /   2898
15000      /   23667
20000      /   25002
25000      /   31282
30000      /   43849
35000      /   53526
40000      /   69321
45000      /   73319
50000      /   80006

My questions now are :
1- What's the search complexity in Lucene (driven by what ?).
2- How can we enhance search performance ?

Thank you.

--------------------------------------------------
Firas Kassem,
d1g corp.



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