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 = 27 and p_type like '%BRASS' 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=823581.28..823581.29 rows=1 width=190) (actual time=28141.996..28142.041 rows=100 loops=1) Buffers: shared hit=1701577 read=158558 -> Sort (cost=823581.28..823581.29 rows=1 width=190) (actual time=28141.992..28142.021 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=1701577 read=158558 -> Merge Join (cost=395374.30..823581.27 rows=1 width=190) (actual time=23305.408..28130.840 rows=4734 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1639 Buffers: shared hit=1701569 read=158558 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8012 width=30) (actual time=0.468..2110.272 rows=8094 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 27)) Rows Removed by Filter: 1991906 Buffers: shared hit=40083 read=6658 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=23304.431..23903.146 rows=1586935 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1504937 read=148131 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.098..21107.891 rows=1586960 loops=1) Buffers: shared hit=1504937 read=148131 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.075..254.818 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=0.008..0.018 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=0.061..221.792 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..75.640 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.027..0.027 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..0.012 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=0.065..1.016 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1502756 read=148131 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.190..0.191 rows=1 loops=6373) Buffers: shared hit=156549 read=3769 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.129..0.186 rows=2 loops=6373) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156549 read=3769 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.007..0.009 rows=1 loops=6373) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6373 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.085..0.174 rows=4 loops=6373) Buffers: shared hit=150176 read=3769 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.075..0.143 rows=4 loops=6373) Buffers: shared hit=99192 read=3769 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.052..0.055 rows=4 loops=6373) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22581 read=3769 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.020..0.020 rows=1 loops=25492) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76611 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=25492) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50984 Total runtime: 28193.091 ms (67 rows) COMMIT; COMMIT