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 = 23 and p_type like '%BRASS' 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=822593.90..822593.91 rows=1 width=190) (actual time=11131.273..11131.307 rows=100 loops=1) Buffers: shared hit=1842345 read=35404 -> Sort (cost=822593.90..822593.91 rows=1 width=190) (actual time=11131.269..11131.287 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=1842345 read=35404 -> Merge Join (cost=395240.92..822593.89 rows=1 width=190) (actual time=7073.481..11120.932 rows=4714 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1651 Buffers: shared hit=1842337 read=35404 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7991 width=30) (actual time=0.644..1875.655 rows=8062 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 23)) Rows Removed by Filter: 1991938 Buffers: shared hit=24551 read=22190 -> Sort (cost=395240.86..399233.87 rows=1597205 width=168) (actual time=7071.079..7614.642 rows=1604050 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1661120 read=9733 -> Nested Loop (cost=1.56..230671.90 rows=1597205 width=168) (actual time=0.090..5337.153 rows=1604080 loops=1) Buffers: shared hit=1661120 read=9733 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.069..166.187 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=0.008..0.020 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=0.057..143.208 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=0.008..51.059 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=0.005..0.011 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=0.021..0.229 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1658939 read=9733 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.110..0.110 rows=1 loops=6365) Buffers: shared hit=156666 read=3481 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.071..0.106 rows=2 loops=6365) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156666 read=3481 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=6365) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6365 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.046..0.097 rows=4 loops=6365) Buffers: shared hit=150301 read=3481 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.039..0.077 rows=4 loops=6365) Buffers: shared hit=99381 read=3481 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.026..0.029 rows=4 loops=6365) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22877 read=3481 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.010..0.010 rows=1 loops=25460) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76504 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25460) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50920 Total runtime: 11156.199 ms (67 rows) COMMIT; COMMIT