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 = 36 and p_type like '%STEEL' 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=828019.99..828019.99 rows=1 width=190) (actual time=23911.053..23911.094 rows=100 loops=1) Buffers: shared hit=1781057 read=97681 written=23 -> Sort (cost=828019.99..828019.99 rows=1 width=190) (actual time=23911.050..23911.079 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=1781057 read=97681 written=23 -> Merge Join (cost=395374.30..828019.98 rows=1 width=190) (actual time=17927.666..23899.410 rows=4681 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1724 Buffers: shared hit=1781049 read=97681 written=23 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8124 width=30) (actual time=0.155..3016.358 rows=8018 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 36)) Rows Removed by Filter: 1991982 Buffers: shared hit=10727 read=36014 written=12 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=17927.093..18574.673 rows=1603279 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1613069 read=57784 written=10 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.185..14541.206 rows=1604080 loops=1) Buffers: shared hit=1613069 read=57784 written=10 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.075..249.741 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=0.009..0.022 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=0.061..216.852 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=0.010..74.962 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=0.004..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=0.055..0.678 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1610888 read=57784 written=10 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.217..0.217 rows=1 loops=6405) Buffers: shared hit=157253 read=3883 written=1 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.147..0.212 rows=2 loops=6405) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=157253 read=3883 written=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.012 rows=1 loops=6405) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6405 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.099..0.197 rows=4 loops=6405) Buffers: shared hit=150848 read=3883 written=1 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.088..0.163 rows=4 loops=6405) Buffers: shared hit=99608 read=3883 written=1 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.060..0.063 rows=4 loops=6405) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22606 read=3883 written=1 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.023..0.023 rows=1 loops=25620) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77002 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=25620) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51240 Total runtime: 23990.812 ms (67 rows) COMMIT; COMMIT