page in the page tables with a pkey. After this tag is in place ... process performs an access that violates pkey restrictions, it receives a SIGSEGV signal. See sigactionMemory Usage: 24kB -> Index Scan using test_pkey on test (cost=0.29..10.27 rows ... Group Key: foo -> Index Scan using test_pkey on test (cost=0.29..24.29 rowsALTER TABLE distributors DROP CONSTRAINT distributors_pkey, ADD CONSTRAINT distributors_pkey PRIMARY KEY USING INDEXAntwerp Design') ON CONFLICT ON CONSTRAINT distributors_pkey DO NOTHING; Insert new distributor if possible