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 = 47 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'EUROPE' 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 = 'EUROPE' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=826656.26..826656.27 rows=1 width=190) (actual time=10447.951..10447.987 rows=100 loops=1) Buffers: shared hit=1675179 read=205338 -> Sort (cost=826656.26..826656.27 rows=1 width=190) (actual time=10447.949..10447.974 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=1675179 read=205338 -> Merge Join (cost=395548.83..826656.25 rows=1 width=190) (actual time=7304.637..10440.686 rows=4763 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1774 Buffers: shared hit=1675171 read=205338 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8036 width=30) (actual time=0.691..1386.350 rows=8081 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 47)) Rows Removed by Filter: 1991919 Buffers: shared hit=2675 read=44066 -> Sort (cost=395548.83..399548.83 rows=1600000 width=168) (actual time=7303.437..7844.089 rows=1602577 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474854kB Buffers: shared hit=1512275 read=157151 -> Nested Loop (cost=1.56..230671.71 rows=1600000 width=168) (actual time=0.125..5512.103 rows=1602640 loops=1) Buffers: shared hit=1512275 read=157151 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.068..134.738 rows=20033 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79967 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.014 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.052..117.509 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=0.009..44.284 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.023..0.023 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..0.009 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=0.018..0.247 rows=80 loops=20033) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1510094 read=157151 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.065..0.065 rows=1 loops=6537) Buffers: shared hit=160221 read=4121 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.042..0.062 rows=2 loops=6537) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=160221 read=4121 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6537) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6537 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.028..0.058 rows=4 loops=6537) Buffers: shared hit=153684 read=4121 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.025..0.048 rows=4 loops=6537) Buffers: shared hit=101388 read=4121 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.016..0.018 rows=4 loops=6537) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22804 read=4121 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=26148) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=78584 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=26148) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52296 Total runtime: 10494.737 ms (67 rows) COMMIT; COMMIT