Re: Downgrading v8.4 database to v8.3

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Greg Smith <greg@xxxxxxxxxxxxxxx> writes:
> Jason Tan Boon Teck wrote:
>> I need to move some databases written in Psql v8.4 to the stable
>> production server running v8.3. I tried pg_dump and pg_restore as well
>> as PgAdmin3.  I am unable to do so due to the backward
>> incompatibility. Is there anyway to do this?

> You can try connecting a 8.3 client to the 8.4 server, then running 
> pg_dump from that 8.3 client.  That's a  common approach for 
> dump/restore when moving forward a version, and it may resolve your 
> issue when moving backward one too.  The 8.3 client shouldn't dump 
> anything the 8.3 server doesn't know how to restore.

That's very likely to fail, and worse to do so silently, because 8.3
pg_dump doesn't know what's different about 8.4 system catalogs.

I think your only real recourse in this situation is to do a plain dump
from the 8.4 server (with 8.4 pg_dump) and then manually edit the dump
script to remove any 8.4-only syntax.  If your application isn't actually
using any 8.4-only features this should be a pretty trivial matter.
If it is, then of course you have some work to do.

			regards, tom lane

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