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 = 22 and p_type like '%BRASS' 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=815013.19..815013.20 rows=1 width=190) (actual time=14304.441..14304.474 rows=100 loops=1) Buffers: shared hit=1615856 read=240209 written=8028 -> Sort (cost=815013.19..815013.20 rows=1 width=190) (actual time=14304.438..14304.461 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=1615856 read=240209 written=8028 -> Merge Join (cost=395240.92..815013.18 rows=1 width=190) (actual time=10148.707..14295.339 rows=4585 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1628 Buffers: shared hit=1615848 read=240209 written=8028 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7800 width=30) (actual time=0.069..1883.758 rows=7941 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 22)) Rows Removed by Filter: 1992059 Buffers: shared hit=757 read=45984 written=3071 -> Sort (cost=395240.86..399233.87 rows=1597205 width=168) (actual time=10148.268..10878.050 rows=1586835 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1464322 read=188746 written=4559 -> Nested Loop (cost=1.56..230671.90 rows=1597205 width=168) (actual time=0.057..7769.007 rows=1586960 loops=1) Buffers: shared hit=1464322 read=188746 written=4559 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.047..211.388 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=222 read=1959 written=355 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.045 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=0.036..185.003 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=221 read=1959 written=355 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.005..78.540 rows=100000 loops=1) Buffers: shared hit=220 read=1959 written=355 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.018..0.018 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=0.028..0.352 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1464100 read=186787 written=4204 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.101..0.101 rows=1 loops=6213) Buffers: shared hit=150769 read=5479 written=398 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.066..0.097 rows=2 loops=6213) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=150769 read=5479 written=398 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.006 rows=1 loops=6213) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6213 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.043..0.089 rows=4 loops=6213) Buffers: shared hit=144556 read=5479 written=398 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.039..0.074 rows=4 loops=6213) Buffers: shared hit=94852 read=5479 written=398 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.024..0.026 rows=4 loops=6213) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21324 read=4321 written=269 -> 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=24852) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=73528 read=1158 written=129 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.003 rows=1 loops=24852) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=49704 Total runtime: 14381.056 ms (67 rows) COMMIT; COMMIT