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 = 12 and p_type like '%COPPER' 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=802243.91..802243.91 rows=1 width=190) (actual time=9696.522..9696.548 rows=100 loops=1) Buffers: shared hit=1760315 read=118711 written=115 -> Sort (cost=802243.91..802243.91 rows=1 width=190) (actual time=9696.521..9696.536 rows=100 loops=1) Sort Key: supplier.s_acctbal, nation.n_name, supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1760315 read=118711 written=115 -> Merge Join (cost=381648.19..802243.90 rows=1 width=190) (actual time=7149.656..9690.373 rows=4794 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1669 Buffers: shared hit=1760307 read=118711 written=115 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7935 width=30) (actual time=0.714..1244.779 rows=8011 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 12)) Rows Removed by Filter: 1991989 Buffers: shared hit=3842 read=42899 written=36 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=7146.752..7508.553 rows=1602954 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=1601153 read=68529 written=73 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.098..4307.493 rows=1602960 loops=1) Buffers: shared hit=1601153 read=68529 written=73 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.058..102.118 rows=20037 loops=1) Join Filter: (nation.n_regionkey = 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=0.006..0.010 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=0.042..87.023 rows=100000 loops=1) Hash Cond: (supplier.s_nationkey = nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.009..33.734 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.43..9.75 rows=80 width=12) (actual time=0.016..0.189 rows=80 loops=20037) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1598972 read=68529 written=73 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.066..0.066 rows=1 loops=6463) Buffers: shared hit=155312 read=7283 written=6 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.044..0.064 rows=2 loops=6463) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155312 read=7283 written=6 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6463) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6463 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.030..0.060 rows=4 loops=6463) Buffers: shared hit=148849 read=7283 written=6 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.028..0.050 rows=4 loops=6463) Buffers: shared hit=97145 read=7283 written=6 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.020..0.022 rows=4 loops=6463) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=19437 read=7283 written=6 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=25852) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77708 -> Index Scan using pk_nation on nation nation_1 (cost=0.14..0.16 rows=1 width=8) (actual time=0.001..0.002 rows=1 loops=25852) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51704 Planning time: 5.592 ms Execution time: 9745.713 ms (68 rows) COMMIT; COMMIT