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 = 32 and p_type like '%COPPER' 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=820321.85..820321.86 rows=1 width=190) (actual time=54069.339..54069.387 rows=100 loops=1) Buffers: shared hit=1659363 read=201693 written=6188 -> Sort (cost=820321.85..820321.86 rows=1 width=190) (actual time=54069.335..54069.365 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=1659363 read=201693 written=6188 -> Merge Join (cost=395548.32..820321.84 rows=1 width=190) (actual time=44013.473..54053.831 rows=4690 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1717 Buffers: shared hit=1659355 read=201693 written=6188 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7878 width=30) (actual time=0.692..4434.700 rows=8024 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 32)) Rows Removed by Filter: 1991976 Buffers: shared hit=9924 read=36817 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=44010.799..44640.683 rows=1586365 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1492054 read=161014 written=6188 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.112..41287.304 rows=1586960 loops=1) Buffers: shared hit=1492054 read=161014 written=6188 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.078..361.926 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=0.007..0.019 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=0.064..310.880 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=0.014..102.938 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.026..0.026 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=0.005..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=0.136..2.021 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1489873 read=161014 written=6188 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.624..0.624 rows=1 loops=6407) Buffers: shared hit=157377 read=3862 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.447..0.617 rows=2 loops=6407) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157377 read=3862 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.047..0.049 rows=1 loops=6407) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6407 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.294..0.564 rows=4 loops=6407) Buffers: shared hit=150970 read=3862 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.194..0.367 rows=4 loops=6407) Buffers: shared hit=99714 read=3862 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.115..0.121 rows=4 loops=6407) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22694 read=3862 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.059..0.059 rows=1 loops=25628) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77020 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.047..0.047 rows=1 loops=25628) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51256 Total runtime: 54115.968 ms (67 rows) COMMIT; COMMIT