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 = 37 and p_type like '%STEEL' 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=884512.83..884512.84 rows=1 width=190) (actual time=8644.438..8644.459 rows=100 loops=1) Buffers: shared hit=177108 read=213319 written=6537 -> Sort (cost=884512.83..884512.84 rows=1 width=190) (actual time=8644.437..8644.447 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=177108 read=213319 written=6537 -> Merge Join (cost=465676.21..884512.82 rows=1 width=190) (actual time=6593.217..8639.476 rows=4739 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1692 Buffers: shared hit=177100 read=213319 written=6537 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7971 width=30) (actual time=0.728..1257.324 rows=7994 loops=1) Filter: (((p_type)::text ~~ '%STEEL'::text) AND (p_size = 37)) Rows Removed by Filter: 1992006 Buffers: shared hit=9750 read=36991 written=4737 -> Sort (cost=465675.78..469675.54 rows=1599904 width=168) (actual time=6592.092..6710.339 rows=1603965 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=10904 read=170957 written=1173 -> Hash Join (cost=3852.20..300809.24 rows=1599904 width=168) (actual time=158.018..5448.698 rows=1604080 loops=1) Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey) Buffers: shared hit=10904 read=170957 written=1173 -> Seq Scan on partsupp (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.003..2882.900 rows=8000000 loops=1) Buffers: shared hit=2 read=170956 written=1173 -> Hash (cost=3602.20..3602.20 rows=20000 width=164) (actual time=157.882..157.882 rows=20051 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 4153kB Buffers: shared hit=10902 read=1 -> Nested Loop (cost=332.07..3602.20 rows=20000 width=164) (actual time=0.308..146.682 rows=20051 loops=1) Buffers: shared hit=10902 read=1 -> Hash Join (cost=1.07..2.47 rows=5 width=30) (actual time=0.022..0.042 rows=5 loops=1) Hash Cond: (nation.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.002..0.006 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.012..0.012 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.008 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on supplier (cost=331.00..679.95 rows=4000 width=142) (actual time=0.252..28.490 rows=4010 loops=5) Recheck Cond: (s_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 95990 Heap Blocks: lossy=10895 Buffers: shared hit=10900 read=1 -> Bitmap Index Scan on supplier_s_nationkey_s_suppkey_brin_idx (cost=0.00..330.00 rows=4000 width=0) (actual time=0.237..0.237 rows=23040 loops=5) Index Cond: (s_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=1 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.059..0.059 rows=1 loops=6431) Buffers: shared hit=156446 read=5371 written=627 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.038..0.054 rows=2 loops=6431) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156446 read=5371 written=627 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6431) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6431 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.027..0.050 rows=4 loops=6431) Buffers: shared hit=150015 read=5371 written=627 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.025..0.041 rows=4 loops=6431) Buffers: shared hit=98567 read=5371 written=627 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.019..0.021 rows=4 loops=6431) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21273 read=5371 written=627 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.004..0.004 rows=1 loops=25724) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77294 -> 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=25724) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51448 Planning time: 4.941 ms Execution time: 8676.209 ms (75 rows) COMMIT; COMMIT