Thread: Performance-Tuning

Hi,

I have a table with the fields data(timestamp), region and url (varchar)
This table has 4.5mio entries a day. To reduce them I use the following
insert-statement.

insert into msreduce select distinct on (region, url) '1-16-2001',region,url,count(client) from microsoftlog where date
>'1-16-2001' and date < '1-17-2001' group by region,url 

My question: Could this be optimized?

Konstantin
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Konstantin Agouros - NetAge Solutions, Dingolfinger Str. 6, 81673 Muenchen
Tel.: 089 666584-0, Fax: 089 666584-11, Email: Konstantin.Agouros@netage.de
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Dipl-Inf. Konstantin Agouros aka Elwood Blues. Internet: elwood@agouros.de
Otkerstr. 28, 81547 Muenchen, Germany. Tel +49 89 69370185
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Well, since you're grouping, you don't need the distinct on (it's
sort of assumed by group by - you're only going to get one group
for each distinct value set of your grouped columns).  In my
explain, this cuts out a unique step on my small tables, not
sure how significant that's going to be on an already unique
set of columns though.

On Fri, 19 Jan 2001, Konstantinos Agouros wrote:

> Hi,
>
> I have a table with the fields data(timestamp), region and url (varchar)
> This table has 4.5mio entries a day. To reduce them I use the following
> insert-statement.
>
> insert into msreduce select distinct on (region, url) '1-16-2001',region,url,count(client) from microsoftlog where
date> '1-16-2001' and date < '1-17-2001' group by region,url 
>
> My question: Could this be optimized?