| From: | hubert depesz lubaczewski <depesz(at)depesz(dot)com> |
|---|---|
| To: | AI Rumman <rummandba(at)gmail(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: add column with default value is very slow |
| Date: | 2012-09-11 14:05:54 |
| Message-ID: | 20120911140554.GA8922@depesz.com |
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| Lists: | pgsql-performance |
On Tue, Sep 11, 2012 at 08:04:06PM +0600, AI Rumman wrote:
> Table size is 1186 MB.
if it takes long, it just means that your IO is slow.
> I split the command in three steps as you said, but the result same during
> the update operation.
three? I was showing four steps, and one of them is usually consisting
hundreds, if not thousands, of queries.
> One more thing, I have just restored the db from dump and analyzed it and
> I am using Postgresql 9.1 with 3 GB Ram with dual core machine.
so it looks like your IO channel is slow.
Best regards,
depesz
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