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 = 40 and p_type like '%BRASS' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' 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 = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=807120.86..807120.87 rows=1 width=190) (actual time=9679.328..9679.359 rows=100 loops=1) Buffers: shared hit=1793243 read=80200 written=177 -> Sort (cost=807120.86..807120.87 rows=1 width=190) (actual time=9679.325..9679.344 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=1793243 read=80200 written=177 -> Merge Join (cost=381593.57..807120.85 rows=1 width=190) (actual time=6678.083..9673.304 rows=4576 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1617 Buffers: shared hit=1793235 read=80200 written=177 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8064 width=30) (actual time=0.241..1226.549 rows=7830 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 40)) Rows Removed by Filter: 1992170 Buffers: shared hit=756 read=45985 written=163 -> Sort (cost=381593.06..385591.78 rows=1599488 width=168) (actual time=6677.225..7348.350 rows=1603834 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1640992 read=29861 -> Nested Loop (cost=2.00..216772.39 rows=1599488 width=168) (actual time=0.065..3749.742 rows=1604080 loops=1) Buffers: shared hit=1640992 read=29861 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.053..101.447 rows=20051 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.011 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.044..87.172 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=0.008..34.814 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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..0.008 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..0.162 rows=80 loops=20051) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1638811 read=29861 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.058..0.058 rows=1 loops=6193) Buffers: shared hit=151487 read=4354 written=14 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.037..0.056 rows=2 loops=6193) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=151487 read=4354 written=14 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=6193) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6193 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.025..0.052 rows=4 loops=6193) Buffers: shared hit=145294 read=4354 written=14 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.022..0.043 rows=4 loops=6193) Buffers: shared hit=95751 read=4353 written=14 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.015..0.017 rows=4 loops=6193) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21294 read=4353 written=14 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=24772) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=74457 -> 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=24772) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49543 read=1 Planning time: 5.394 ms Execution time: 9744.847 ms (68 rows) COMMIT; COMMIT