On Fri, 4 Jul 2008, Teodor Sigaev wrote:

What's the benefit of a multi-column GIN index over multiple
single-column GIN indexes?

Page 12 from presentation on PgCon (http://www.sigaev.ru/gin/fastinsert_and_multicolumn_GIN.pdf):

Multicolumn index vs.  2 single column indexes

Size:    539 Mb        538 Mb
Speed:   *1.885* ms    4.994 ms
Index:   ~340 s        ~200 s
Insert:  72 s/10000    66 s/10000

Well, another reason is a index feature-completeness

Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: [EMAIL PROTECTED], http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83

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