| From: | Teodor Sigaev <teodor(at)sigaev(dot)ru> |
|---|---|
| To: | 沈一枫 <alphahunters(at)163(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: re : tsearch2 problem |
| Date: | 2005-10-18 08:09:13 |
| Message-ID: | 4354ADA9.4040801@sigaev.ru |
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| Thread: | |
| Lists: | pgsql-general |
> because of its way of "Inverse Order OF Idexing",and "The GiST Tree is
> well for larting lan but doesn't for chinese lan(also ineffifent for
> Japanese lan)"。
About japanese look at http://www.oss.ecl.ntt.co.jp/tsearch2j/ (it's on
Japanese, but you can contact with developer)
>
>
>
> I only know that GiST is also "Inverse Order OF Idexing",but of course
> it is a tree NOT as lucene does
Tsearch2 doesn't use inverted index (yet), and so it easy to update (your index
is always full - online indexing), but it hasn't good performance on large data
set. The limit is about 10^5 - 10^6 rows in practice.
--
Teodor Sigaev E-mail: teodor(at)sigaev(dot)ru
WWW: http://www.sigaev.ru/
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