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 = 36 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=832042.65..832042.66 rows=1 width=190) (actual time=12755.108..12755.139 rows=100 loops=1) Buffers: shared hit=1868381 read=10854 written=17 -> Sort (cost=832042.65..832042.66 rows=1 width=190) (actual time=12755.104..12755.122 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=1868381 read=10854 written=17 -> Merge Join (cost=395548.99..832042.64 rows=1 width=190) (actual time=9079.883..12745.670 rows=4784 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1689 Buffers: shared hit=1868373 read=10854 written=17 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8174 width=30) (actual time=0.167..1510.292 rows=8018 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 36)) Rows Removed by Filter: 1991982 Buffers: shared hit=46740 read=1 -> Sort (cost=395548.99..399548.99 rows=1600000 width=168) (actual time=9077.987..9642.385 rows=1602200 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1662012 read=7670 written=13 -> Nested Loop (cost=1.56..230671.86 rows=1600000 width=168) (actual time=0.182..6635.119 rows=1602960 loops=1) Buffers: shared hit=1662012 read=7670 written=13 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.088..179.085 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.023 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.062..154.897 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=0.012..55.325 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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=0.006..0.010 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=0.024..0.291 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1659831 read=7670 written=13 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.114..0.114 rows=1 loops=6473) Buffers: shared hit=159621 read=3183 written=4 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.072..0.110 rows=2 loops=6473) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159621 read=3183 written=4 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=6473) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6473 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.046..0.102 rows=4 loops=6473) Buffers: shared hit=153148 read=3183 written=4 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.039..0.079 rows=4 loops=6473) Buffers: shared hit=101364 read=3183 written=4 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.024..0.027 rows=4 loops=6473) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23545 read=3183 written=4 -> 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=25892) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77819 -> 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=25892) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51784 Total runtime: 12813.467 ms (67 rows) COMMIT; COMMIT