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 = 40 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=821419.06..821419.06 rows=1 width=190) (actual time=7859.351..7859.371 rows=100 loops=1) Buffers: shared hit=1659589 read=198797 -> Sort (cost=821419.06..821419.06 rows=1 width=190) (actual time=7859.348..7859.358 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=1659589 read=198797 -> Merge Join (cost=395548.32..821419.05 rows=1 width=190) (actual time=5338.511..7854.721 rows=4646 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1656 Buffers: shared hit=1659581 read=198797 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7905 width=30) (actual time=0.196..990.840 rows=7891 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 40)) Rows Removed by Filter: 1992109 Buffers: shared hit=41278 read=5463 -> Sort (cost=395548.32..399548.32 rows=1600000 width=168) (actual time=5337.876..5747.391 rows=1586951 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=1.56..230671.20 rows=1600000 width=168) (actual time=0.145..4089.406 rows=1586960 loops=1) Buffers: shared hit=1464352 read=188716 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.082..105.864 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=4 read=2177 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.026 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=0.063..91.544 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=3 read=2177 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.003..45.597 rows=100000 loops=1) Buffers: shared hit=2 read=2177 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.033..0.033 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=0.003..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=0.015..0.182 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1464348 read=186539 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.050..0.050 rows=1 loops=6302) Buffers: shared hit=153951 read=4618 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.033..0.048 rows=2 loops=6302) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=153951 read=4618 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6302) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6302 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.023..0.045 rows=4 loops=6302) Buffers: shared hit=147649 read=4618 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.022..0.039 rows=4 loops=6302) Buffers: shared hit=97233 read=4618 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.016..0.017 rows=4 loops=6302) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21761 read=4346 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25208) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75472 read=272 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.001..0.001 rows=1 loops=25208) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50416 Total runtime: 7881.999 ms (67 rows) COMMIT; COMMIT