You can benchmark your scenario with and without constraint using a tool
like nancy:
https://gitlab.com/postgres-ai/nancy
it lets you A/B test different configurations with your own scenarios or
using pgbench synthetic workloads.
-Michel
On Wed, Jul 22, 2020 at 9:27 AM Samuel Nelson
wrote:
>
On Wed, Jul 22, 2020 at 9:03 AM Samuel Nelson
wrote:
> seems to fix it to work as we were expecting. Is that particularly
> costly? Should I only set the constraint to be deferred when we really
> need it? Would it be more efficient to perform the deletes explicitly
> within a transaction rath
I checked, and changing the `bazinga_foo_bar` constraint to:
alter table bazinga add constraint bazinga_foo_bar foreign key (foo_id,
bar_id) references foo_bar (foo_id, bar_id) deferrable initially deferred;
seems to fix it to work as we were expecting. Is that particularly
costly? Should I onl
On Wed, Jul 22, 2020 at 8:24 AM Samuel Nelson
wrote:
> Is there a way to force the delete to cascade to tables in a specific
> order?
>
No really, but you can defer constraint checking.
https://www.postgresql.org/docs/12/sql-set-constraints.html
David J.
