Re: Foreign key slows down copy/insert - Mailing list pgsql-performance

Hello Chris,

Thanks for your answers.

Christopher Kings-Lynne wrote:
> Deferring makes no difference to FK checking speed...

But why then is the speed acceptable if I copy and then manually add the
FK? Is the check done by the FK so much different from when it is done
automatically using an active deffered FK?

> Well, that's what people do - even pg_dump will restore data and add the
> foreign key afterward...

If I have to go this route, is there a way of automatically dropping and
re-adding FKs? I can probably query pg_constraints and drop the
appropriate ones, but how do I re-add them after the copy/insert?

Sincerely,

--
Richard van den Berg, CISSP
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