In a version 15.4 postgres database, Is it possible that , if we have two big range partition tables with foreign key relationships between them, insert into the child table can cause slowness if we don't have foreign key index present in the child table? Basically it need to make sure the new row already added to parent partition table or not.
And if there is any possible way(example query tracing etc) to get the underlying system queries which gets triggered as part of the main insert query? For example in above scenario, postgres must be executing some query to check if the incoming row to the child table already exists in the parent table or not?
