On Tue, 2003-05-13 at 00:02, timeless postgres wrote:
...
> Maybe I don't understand how to ask the question. I want to know how to
> insert (say) 10M rows into a table quickly. I mean... VERY quickly.
>
> Obviously the following 10M transactions are going to be slow:
>
> insert into tab values (1);
> insert into tab values (2);
> insert into tab values (3);
> . . .
> insert into tab values (10000000);
>
> Would it be faster if I put a single transaction around that?
10M transactions are going to be slow. 10M inserts in one transaction or
in a few transactions will be a lot faster.
> Would it
> be faster to do the following?
>
> copy tab (col) from stdin;
> 1
> 2
> 3
> . . .
> 10000000
> \.
Yes, that will be the fastest of all.
> > It should be noted though that as of
> > 7.3, operations on TEMP tables don't do WAL logging; perhaps that
> > would be of use to you.
>
> It does sound useful, on new tables, to load into a temp table, then
> rename the temp table as permanent table.
I don't think that is possible.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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