Re: Querying distinct values from a large table
| От | Alvaro Herrera |
|---|---|
| Тема | Re: Querying distinct values from a large table |
| Дата | |
| Msg-id | 20070130210303.GA2178@alvh.no-ip.org обсуждение |
| Ответ на | Re: Querying distinct values from a large table ("Luke Lonergan" <llonergan@greenplum.com>) |
| Список | pgsql-performance |
Luke Lonergan wrote: > Alvaro, > > On 1/30/07 9:04 AM, "Alvaro Herrera" <alvherre@commandprompt.com> wrote: > > >> (Incidentally I'm not sure where 2-5x comes from. It's entirely dependant on > >> your data distribution. It's not hard to come up with distributions where > >> it's > >> 1000x as fast and others where there's no speed difference.) > > > > So the figure is really "1-1000x"? I bet this one is more impressive in > > PHB terms. > > You got me - I'll bite - what's PHB? Pointy-Haired Boss, a term (AFAIK) popularized by the Dilbert comic strip. Why, I just noticed there's even a Wikipedia entry: http://en.wikipedia.org/wiki/Pointy_Haired_Boss It seems people enjoy writing hypothetically about their bosses. -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc.
В списке pgsql-performance по дате отправления: