Re: Ways to speed up dump&reload

Hi Markus,

Have you considered installing slony and replicate from the old version
to the new one ? It can do that, and when the replica is up to date, the
switchover will take minutes I guess.
Note that I have never done that so please ask others about that too, or
research for yourself ;-)

Cheers,
Csaba.


On Mon, 2005-02-21 at 07:11, Markus Wollny wrote:
> Hello!
>
> Finally the time has come for us to upgrade our PostgreSQL 7.4.5-servers to 8.0.1 - and though I'm very much looking
forwardto some of the new features, the dump&reload process is worrying me a bit this time. I've got one cluster in
particularwhich is roughly 9GB in size and features some dreadfully large indices of the GiST-type for Tsearch2. 
>
> I have already scheduled a nightshift for this upgrade, but I'm not all too certain that I'll be up and running again
inthe morning, so I wondered if there might be some preparations that would allow for some speed-up during the reload
process?What kind of tuning could be done in postgresql.conf in respect to just this particular workload (COPY and
finallythe CREATE INDEX stuff) with no other concurrent access going on? 
>
> The machine in question features a RAID10 disk array which hosts the DB-cluster, some 2GB RAM and four processors and
I'vetuned postgresql.conf for our ordinary everyday workload with lots and lots of concurrent reads and writes, but
I'vegot the feeling that this configuration might not be the optimum for dump&reload, so it might make some sense to
usesome sort of "maintenance"-configuration. What kind of tuning would you recommend? 
>
> Thank you very much for your advice and lots of cheers to the developers for 8.0!
>
> Kind regards
>
>    Markus
>
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