On Wed, Dec 15, 2010 at 10:17 AM, Yan Cheng CHEOK <ycch...@yahoo.com> wrote: > Previously, I am inserting a bulk of data by using the following way. > > for each item > update item into table > if row count is 0 > insert items into table > > I realize I am suffering performance problem. > > Later, I realize it is much fast by using > > COPY > > I am very happy with the speed. > > Later, I realize that COPY doesn't work well, if I already have a row with > same unique key. What I did is > > # Try to remove old rows first > delete row where <condition> > # And perform really fast insertion > COPY > > I was wondering, is this a common technique being use for fast bulk data > insertion? Is there other techniques.
Copy your data to a scratch table: create temp table scratch (like foo); copy scratch... then do the update: delete from foo where exists (select * from scratch where something); then insert into foo select * from scratch; merlin -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
