Re: pg_restore TODO - delay PK creation

Iain wrote:
> Hi Bruce,
>
> OK, I've just looked into it and you are right, thanks.
>
> In the case I just tested I restored a 7.1 dump to a 7.4.6 db. I had assumed
> that this is a restore time issue but in fact it is dependent on the format
> of the dump file. I noticed the problem after the data load failed and I
> checked the description of the table in question, it had a primary key.
>
> Worth noting for anybody preparing to upgrade large databases from old
> versions. This db takes 8 hours to restore on 7.1 but I just dumped it and
> restored it in less than 20 minutes total on 7.4 :)

Quite a dramatic improvement, though 7.1 is in the ancient category.

> I havn't used 7.4 for dumping/restoring for a long time so I had forgotten
> how it worked. We're just starting a redevelopment that will include an
> upgrade of the production db so I'm looking forward to working with 7.4
> again, though I'd like to be working on v8.
>
> Out of interest, what is the word on using newer versions of pg_dump on
> older verisons of the DB - is it is possible or even wise to unload a 7.1
> DB with the 7.4 version of pg?

It should work. I see version checks for >=70100 in the code so you
should be fine using 7.4 or 8.0 pg_dump for 7.1.

--
Bruce Momjian | http://candle.pha.pa.us
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