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 = 16 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' 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 = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=820271.98..820271.98 rows=1 width=190) (actual time=51911.267..51911.309 rows=100 loops=1) Buffers: shared hit=1777211 read=102352 written=6412 -> Sort (cost=820271.98..820271.98 rows=1 width=190) (actual time=51911.263..51911.281 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=1777211 read=102352 written=6412 -> Merge Join (cost=395548.32..820271.97 rows=1 width=190) (actual time=41161.311..51894.859 rows=4789 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1651 Buffers: shared hit=1777203 read=102352 written=6412 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7876 width=30) (actual time=1.356..5085.233 rows=8116 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 16)) Rows Removed by Filter: 1991884 Buffers: shared hit=2726 read=44015 written=5834 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=41159.462..41749.328 rows=1604020 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1616558 read=54295 written=80 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=1.148..37711.759 rows=1604080 loops=1) Buffers: shared hit=1616558 read=54295 written=80 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=1.103..347.174 rows=20051 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.022..0.032 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=1.064..300.790 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=0.021..110.808 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=1.001..1.001 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=0.973..0.979 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=0.142..1.826 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1614377 read=54295 written=80 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.639..0.639 rows=1 loops=6440) Buffers: shared hit=157919 read=4042 written=498 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.462..0.632 rows=2 loops=6440) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157919 read=4042 written=498 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.052..0.054 rows=1 loops=6440) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6440 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.294..0.573 rows=4 loops=6440) Buffers: shared hit=151479 read=4042 written=498 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.205..0.381 rows=4 loops=6440) Buffers: shared hit=99959 read=4042 written=498 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.118..0.122 rows=4 loops=6440) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22549 read=4042 written=498 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.062..0.062 rows=1 loops=25760) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77410 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.046..0.046 rows=1 loops=25760) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51520 Total runtime: 51966.764 ms (67 rows) COMMIT; COMMIT