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 = 33 and p_type like '%COPPER' 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=828501.03..828501.04 rows=1 width=190) (actual time=44217.328..44217.377 rows=100 loops=1) Buffers: shared hit=1675509 read=205716 -> Sort (cost=828501.03..828501.04 rows=1 width=190) (actual time=44217.322..44217.354 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=1675509 read=205716 -> Merge Join (cost=395548.32..828501.02 rows=1 width=190) (actual time=34496.771..44201.904 rows=4741 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1766 Buffers: shared hit=1675501 read=205716 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8083 width=30) (actual time=1.610..4511.257 rows=8031 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 33)) Rows Removed by Filter: 1991969 Buffers: shared hit=7380 read=39361 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=34494.400..35194.044 rows=1603664 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1508337 read=162516 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=1.277..31851.936 rows=1604080 loops=1) Buffers: shared hit=1508337 read=162516 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.094..317.386 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=0.012..0.024 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=0.074..272.259 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=0.015..92.885 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.029..0.029 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=0.007..0.013 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=0.107..1.535 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1506156 read=162516 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.535..0.535 rows=1 loops=6507) Buffers: shared hit=159784 read=3839 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.360..0.528 rows=2 loops=6507) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159784 read=3839 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.029..0.031 rows=1 loops=6507) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6507 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.242..0.493 rows=4 loops=6507) Buffers: shared hit=153277 read=3839 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.175..0.336 rows=4 loops=6507) Buffers: shared hit=101221 read=3839 -> 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=6507) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22997 read=3839 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.054..0.055 rows=1 loops=26028) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=78224 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.037..0.038 rows=1 loops=26028) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52056 Total runtime: 44286.278 ms (67 rows) COMMIT; COMMIT