according to http://www.postgresql.org/docs/8.0/interactive/limitations.html , concurrent access to GiST indexes isn't possible at the moment. I haven't read the thesis mentioned there, but I presume that concurrent read access is also impossible. Is there any workaround for this, esp. if the index is usually only read and not written to?

It seems to be a big problem with tsearch2, when multiple clients are hammering the db (we have a quad opteron box here that stays 75% idle despite an apachebench with concurrency 10 stressing the php script that uses tsearch2, with practically no disk accesses)

Dipl.-Ing. Marinos Yannikos, CEO
Preisvergleich Internet Services AG
Obere Donaustraße 63/2, A-1020 Wien
Tel./Fax: (+431) 5811609-52/-55

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