Re: Is a better way to have the same result of this
От | Vernon Wu |
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Тема | Re: Is a better way to have the same result of this |
Дата | |
Msg-id | IRQFDWTWVKHIDZT51RP4UOWUFAQOYX.3defdf01@kimiko обсуждение исходный текст |
Ответ на | Re: Is a better way to have the same result of this (Andrew Sullivan <andrew@libertyrms.info>) |
Ответы |
Re: Is a better way to have the same result of this
Re: Is a better way to have the same result of this |
Список | pgsql-performance |
Andrew, Following your suggestion, I have combined the year field with the gender to create a multicolumn index. That shall be better than indexing gender alone. I also create a multicolumn index (country, province, city) for the account table. Would you suggest indexing all possible fields such as ethnicity, religion , education, employment in the profile table;or based on what queries I run, to have some multicolumn indexes? BTW, do you get a lot of snow in Toronto these few days? Veronon 12/5/2002 11:57:50 AM, Andrew Sullivan <andrew@libertyrms.info> wrote: >On Thu, Dec 05, 2002 at 11:08:17AM -0800, Vernon Wu wrote: >> Ron, >> >> The gender is indexed. > >Given that gender only has two (? Very few, anyway) values, I can't >believe an index will be much use: it's not very selective. Maybe >combining several columns in one index will help you. > >A > >-- >---- >Andrew Sullivan 204-4141 Yonge Street >Liberty RMS Toronto, Ontario Canada ><andrew@libertyrms.info> M2P 2A8 > +1 416 646 3304 x110 > > >---------------------------(end of broadcast)--------------------------- >TIP 2: you can get off all lists at once with the unregister command > (send "unregister YourEmailAddressHere" to majordomo@postgresql.org) >
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