How to merge table faster

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#1 (permalink)

04-18-2008, 12:35 PM

bhushan.karia@gmail.com

Posts: n/a

How to merge table faster

Hi i am having performance problem whenever i merge some tables by
following query it takes too much time.

create table tblusersurfingdetail as select * from
tblusersurfingdetail200507 union select * from
tblusersurfingdetail200506 union select * from
tblusersurfingdetail200505;
It takes about 220 Secs. to merge these tables. I have tried one
alternative with copy command.

copy tblusersurfingdetail200507 to
'/var/csvs/tblusersurfingdetail200507records.csv' with csv;
copy tblusersurfingdetail200506 to
'/var/csvs/tblusersurfingdetail200506records.csv' with csv;
copy tblusersurfingdetail200505 to
'/var/csvs/tblusersurfingdetail200505records.csv' with csv;
copy tblusersurfingdetail from
'/var/csvs/tblusersurfingdetail200507records.csv' with csv;
copy tblusersurfingdetail from
'/var/csvs/tblusersurfingdetail200506records.csv' with csv;
copy tblusersurfingdetail from
'/var/csvs/tblusersurfingdetail200505records.csv' with csv;

It takes 143 Secs.
When i import and export with binary option in copy command it
takes 118 Secs.
These 3 tables contains more than 12 lakhs records.

« Strange planner decision on quite simple select | Re: Strange planner decision on quite simple select »

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How to merge table faster