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 = 21 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' 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 = 'EUROPE' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=819823.12..819823.12 rows=1 width=190) (actual time=57565.216..57565.261 rows=100 loops=1) Buffers: shared hit=1576602 read=298321 written=642 -> Sort (cost=819823.12..819823.12 rows=1 width=190) (actual time=57565.212..57565.241 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=1576602 read=298321 written=642 -> Merge Join (cost=395548.32..819823.11 rows=1 width=190) (actual time=48791.379..57550.015 rows=4709 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1601 Buffers: shared hit=1576594 read=298321 written=642 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7865 width=30) (actual time=2.281..4201.906 rows=7987 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 21)) Rows Removed by Filter: 1992013 Buffers: shared hit=9626 read=37115 written=578 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=48787.982..49339.907 rows=1602640 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1411801 read=257625 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.496..46370.141 rows=1602640 loops=1) Buffers: shared hit=1411801 read=257625 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.386..348.330 rows=20033 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.269..0.280 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.094..299.880 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=0.017..96.886 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.033..0.033 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=0.009..0.016 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=0.141..2.256 rows=80 loops=20033) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1409620 read=257625 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.487..0.487 rows=1 loops=6310) Buffers: shared hit=155167 read=3581 written=64 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.349..0.481 rows=2 loops=6310) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155167 read=3581 written=64 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.039..0.041 rows=1 loops=6310) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6310 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.221..0.436 rows=4 loops=6310) Buffers: shared hit=148857 read=3581 written=64 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.167..0.308 rows=4 loops=6310) Buffers: shared hit=98377 read=3581 written=64 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.103..0.108 rows=4 loops=6310) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22535 read=3581 written=64 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.047..0.048 rows=1 loops=25240) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75842 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.030..0.030 rows=1 loops=25240) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50480 Total runtime: 57597.467 ms (67 rows) COMMIT; COMMIT