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 = 35 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=827775.40..827775.41 rows=1 width=190) (actual time=16756.958..16757.000 rows=100 loops=1) Buffers: shared hit=1654500 read=226034 written=87 -> Sort (cost=827775.40..827775.41 rows=1 width=190) (actual time=16756.954..16756.977 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=1654500 read=226034 written=87 -> Merge Join (cost=395522.09..827775.39 rows=1 width=190) (actual time=12183.510..16746.762 rows=4792 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1732 Buffers: shared hit=1654492 read=226034 written=87 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8066 width=30) (actual time=0.221..2184.098 rows=8078 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 35)) Rows Removed by Filter: 1991922 Buffers: shared hit=757 read=45984 written=13 -> Sort (cost=395522.09..399521.49 rows=1599760 width=168) (actual time=12182.504..12856.060 rows=1602952 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1493902 read=175780 written=73 -> Nested Loop (cost=1.56..230671.43 rows=1599760 width=168) (actual time=0.135..9408.882 rows=1602960 loops=1) Buffers: shared hit=1493902 read=175780 written=73 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.090..206.633 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=0.009..0.020 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=0.063..180.562 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=0.011..60.284 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..0.012 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..0.425 rows=80 loops=20037) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1491721 read=175780 written=73 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.126..0.126 rows=1 loops=6524) Buffers: shared hit=159833 read=4270 written=1 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.079..0.122 rows=2 loops=6524) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=159833 read=4270 written=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.004..0.005 rows=1 loops=6524) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6524 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.052..0.114 rows=4 loops=6524) Buffers: shared hit=153309 read=4270 written=1 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.044..0.088 rows=4 loops=6524) Buffers: shared hit=101117 read=4270 written=1 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.030..0.032 rows=4 loops=6524) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22700 read=4270 written=1 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.012..0.012 rows=1 loops=26096) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=78417 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=26096) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=52192 Total runtime: 16808.598 ms (67 rows) COMMIT; COMMIT