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 = 4 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' 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 = 'MIDDLE EAST' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=802861.80..802861.81 rows=1 width=190) (actual time=8344.873..8344.901 rows=100 loops=1) Buffers: shared hit=1813043 read=63796 written=35 -> Sort (cost=802861.80..802861.81 rows=1 width=190) (actual time=8344.871..8344.884 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=1813043 read=63796 written=35 -> Merge Join (cost=381398.14..802861.79 rows=1 width=190) (actual time=5634.352..8339.185 rows=4711 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1642 Buffers: shared hit=1813035 read=63796 written=35 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7969 width=30) (actual time=0.165..1248.633 rows=7950 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 4)) Rows Removed by Filter: 1992050 Buffers: shared hit=6256 read=40485 written=13 -> Sort (cost=381397.71..385392.00 rows=1597715 width=168) (actual time=5633.735..6081.694 rows=1603313 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475045kB Buffers: shared hit=1651987 read=18292 written=17 -> Nested Loop (cost=2.00..216772.52 rows=1597715 width=168) (actual time=0.106..3628.124 rows=1603360 loops=1) Buffers: shared hit=1651987 read=18292 written=17 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.088..102.040 rows=20042 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79958 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.008..0.009 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.073..86.793 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=0.007..33.111 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.048..0.048 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=0.004..0.022 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=0.015..0.156 rows=80 loops=20042) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1649806 read=18292 written=17 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.063..0.063 rows=1 loops=6353) Buffers: shared hit=154792 read=5019 written=5 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.041..0.061 rows=2 loops=6353) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154792 read=5019 written=5 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6353) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6353 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.057 rows=4 loops=6353) Buffers: shared hit=148439 read=5019 written=5 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.025..0.047 rows=4 loops=6353) Buffers: shared hit=97615 read=5019 written=5 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.018..0.020 rows=4 loops=6353) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21221 read=5019 written=5 -> 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=25412) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=76394 -> 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=25412) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50824 Planning time: 6.316 ms Execution time: 8388.454 ms (68 rows) COMMIT; COMMIT