BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select s_acctbal, s_name, n_name, p_partkey, p_mfgr, s_address, s_phone, s_comment from part, supplier, partsupp, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and p_size = 50 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' and ps_supplycost = ( select min(ps_supplycost) from partsupp, supplier, nation, region where p_partkey = ps_partkey and s_suppkey = ps_suppkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=823314.86..823314.87 rows=1 width=190) (actual time=16028.650..16028.688 rows=100 loops=1) Buffers: shared hit=1765243 read=91363 -> Sort (cost=823314.86..823314.87 rows=1 width=190) (actual time=16028.647..16028.665 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1765243 read=91363 -> Merge Join (cost=395548.99..823314.85 rows=1 width=190) (actual time=11366.867..16017.681 rows=4613 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1619 Buffers: shared hit=1765235 read=91363 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7955 width=30) (actual time=1.982..2279.710 rows=7899 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 50)) Rows Removed by Filter: 1992101 Buffers: shared hit=758 read=45983 -> Sort (cost=395548.99..399548.99 rows=1600000 width=168) (actual time=11362.225..12006.606 rows=1586744 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1611706 read=41362 -> Nested Loop (cost=1.56..230671.86 rows=1600000 width=168) (actual time=0.078..7868.844 rows=1586960 loops=1) Buffers: shared hit=1611706 read=41362 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.056..213.345 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.021 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.042..187.852 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.009..66.661 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.014..0.014 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.032..0.353 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1609525 read=41362 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.130..0.130 rows=1 loops=6232) Buffers: shared hit=152771 read=4018 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.086..0.125 rows=2 loops=6232) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=152771 read=4018 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.008 rows=1 loops=6232) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6232 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.058..0.115 rows=4 loops=6232) Buffers: shared hit=146539 read=4018 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.049..0.089 rows=4 loops=6232) Buffers: shared hit=96683 read=4018 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.032..0.035 rows=4 loops=6232) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21741 read=4018 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.011..0.012 rows=1 loops=24928) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=74942 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.004..0.005 rows=1 loops=24928) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=49856 Total runtime: 16101.203 ms (67 rows) COMMIT; COMMIT