Re: dblink without running the full query remotely?

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Probably this is neither possible in Oracle nor in Postgres.
If you are willing to take a complex route, Postgres will allow you to point to PUBLIC  schema where you will need to export the objects at least once for each schema from the source environment.
I hope that I am not slipping any thing.

From: Wells Oliver <wells.oliver@xxxxxxxxx>
Sent: Friday, August 25, 2023 6:12 PM
To: Tom Lane <tgl@xxxxxxxxxxxxx>
Cc: pgsql-admin <pgsql-admin@xxxxxxxxxxxxxx>
Subject: Re: dblink without running the full query remotely?
Thanks, this it exactly.

Correlated, is there a way to define a fdw user mapping for a role versus for every single individual user in a database?

On Fri, Aug 25, 2023 at 2:16 PM Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
Wells Oliver <wells.oliver@xxxxxxxxx> writes:
> Per the documentation -- *dblink fetches the entire remote query result
> before returning any of it to the local system* -- I am guessing the answer
> is no, but I wondered if there was some way to do something like this:
> ...
> Where that remote sometable might have a bajillion rows and the local where
> would be passed to it

No, and it's unlikely anyone would ever put effort into making dblink
do that, because the newer foreign table (FDW) code *does* handle that
sort of thing.  dblink still has its uses, but it's pretty much at a
dead end developmentally.  Take a look at postgres_fdw.

                        regards, tom lane


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