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 = 38 and p_type like '%STEEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=818544.10..818544.10 rows=1 width=190) (actual time=28343.800..28343.828 rows=100 loops=1) Buffers: shared hit=1786058 read=93057 written=1985 -> Sort (cost=818544.10..818544.10 rows=1 width=190) (actual time=28343.797..28343.811 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=1786058 read=93057 written=1985 -> Merge Join (cost=395374.30..818544.09 rows=1 width=190) (actual time=20624.381..28329.503 rows=4804 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1664 Buffers: shared hit=1786050 read=93057 written=1985 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7885 width=30) (actual time=0.483..4092.812 rows=8129 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 38)) Rows Removed by Filter: 1991871 Buffers: shared hit=758 read=45983 written=8 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=20623.104..21216.875 rows=1602901 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1626886 read=42796 written=1973 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=0.151..18263.508 rows=1602960 loops=1) Buffers: shared hit=1626886 read=42796 written=1973 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.091..272.550 rows=20037 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79963 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.013..0.029 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.062..238.434 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=0.013..86.871 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.028..0.028 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=0.006..0.014 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=0.068..0.860 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1624705 read=42796 written=1973 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.314..0.314 rows=1 loops=6468) Buffers: shared hit=158406 read=4278 written=4 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.211..0.307 rows=2 loops=6468) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=158406 read=4278 written=4 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.014..0.015 rows=1 loops=6468) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6468 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.144..0.288 rows=4 loops=6468) Buffers: shared hit=151938 read=4278 written=4 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.128..0.242 rows=4 loops=6468) Buffers: shared hit=100194 read=4278 written=4 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.087..0.091 rows=4 loops=6468) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22452 read=4278 written=4 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.035..0.035 rows=1 loops=25872) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=77742 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.009..0.010 rows=1 loops=25872) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=51744 Total runtime: 28378.882 ms (67 rows) COMMIT; COMMIT