From: | Antonio Goméz Soto <antonio(dot)gomez(dot)soto(at)gmail(dot)com> |
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To: | pgsql-general(at)postgresql(dot)org |
Subject: | alter table performance |
Date: | 2009-12-17 21:26:53 |
Message-ID: | 4B2AA21D.2030903@gmail.com |
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Thread: | |
Lists: | pgsql-general |
Hi,
I am regularly altering tables, adding columns setting default values etc.
This very often takes a very long time and is very disk intensive, and this
gets pretty annoying.
Things are hampered by the fact that some of our servers run PG 7.3
Suppose I have a table and I want to add a non NULL column with a default value.
What I normally do is:
alter table person add column address varchar(64);
update person set address = '' where address IS NULL;
alter table person alter column address set not NULL;
alter table person alter column address set default '';
When the table contains millions of records this takes forever.
Am I doing something wrong? Do other people have the same problems?
Thanks,
Antonio
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