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 = 48 and p_type like '%NICKEL' 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=821818.71..821818.72 rows=1 width=190) (actual time=16467.154..16467.190 rows=100 loops=1) Buffers: shared hit=1641655 read=224373 written=7158 -> Sort (cost=821818.71..821818.72 rows=1 width=190) (actual time=16467.151..16467.165 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=1641655 read=224373 written=7158 -> Merge Join (cost=395548.94..821818.70 rows=1 width=190) (actual time=10903.241..16452.432 rows=4828 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1778 Buffers: shared hit=1641647 read=224373 written=7158 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7942 width=30) (actual time=0.026..2698.233 rows=8182 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 48)) Rows Removed by Filter: 1991818 Buffers: shared hit=757 read=45984 written=131 -> Sort (cost=395548.90..399548.90 rows=1600000 width=168) (actual time=10902.964..11516.740 rows=1586959 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1478855 read=174213 written=7011 -> Nested Loop (cost=1.56..230671.78 rows=1600000 width=168) (actual time=0.058..8935.197 rows=1586960 loops=1) Buffers: shared hit=1478855 read=174213 written=7011 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.046..201.141 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=0.004..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=0.037..174.219 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=0.007..57.658 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.015..0.015 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=0.002..0.004 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=0.027..0.405 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1476674 read=174213 written=7011 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.191..0.191 rows=1 loops=6606) Buffers: shared hit=162035 read=4176 written=16 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.123..0.186 rows=2 loops=6606) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=162035 read=4176 written=16 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.010 rows=1 loops=6606) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6606 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.080..0.173 rows=4 loops=6606) Buffers: shared hit=155429 read=4176 written=16 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.071..0.139 rows=4 loops=6606) Buffers: shared hit=102581 read=4176 written=16 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.047..0.050 rows=4 loops=6606) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=23163 read=4176 written=16 -> 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=26424) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=79418 -> 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=26424) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52848 Total runtime: 16499.307 ms (67 rows) COMMIT; COMMIT