From: | Vernon Wu <vernonw(at)gatewaytech(dot)com> |
---|---|
To: | PgSQL Performance ML <pgsql-performance(at)postgresql(dot)org>, Andrew Sullivan <andrew(at)libertyrms(dot)info> |
Subject: | Re: Is a better way to have the same result of this |
Date: | 2002-12-05 23:19:29 |
Message-ID: | IRQFDWTWVKHIDZT51RP4UOWUFAQOYX.3defdf01@kimiko |
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Lists: | 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(at)libertyrms(dot)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
>
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