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 = 9 and p_type like '%TIN' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AFRICA' 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 = 'AFRICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=882754.10..882754.11 rows=1 width=190) (actual time=7006.306..7006.329 rows=100 loops=1) Buffers: shared hit=329937 read=53615 -> Sort (cost=882754.10..882754.11 rows=1 width=190) (actual time=7006.304..7006.316 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=329937 read=53615 -> Merge Join (cost=465676.21..882754.09 rows=1 width=190) (actual time=5079.443..7001.644 rows=4575 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1586 Buffers: shared hit=329929 read=53615 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=7925 width=30) (actual time=0.217..1146.077 rows=7844 loops=1) Filter: (((p_type)::text ~~ '%TIN'::text) AND (p_size = 9)) Rows Removed by Filter: 1992156 Buffers: shared hit=756 read=45985 -> Sort (cost=465675.78..469675.54 rows=1599904 width=168) (actual time=5078.982..5197.899 rows=1586830 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=181861 -> Hash Join (cost=3852.20..300809.24 rows=1599904 width=168) (actual time=159.146..4027.061 rows=1586960 loops=1) Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey) Buffers: shared hit=181861 -> Seq Scan on partsupp (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.005..1638.363 rows=8000000 loops=1) Buffers: shared hit=170958 -> Hash (cost=3602.20..3602.20 rows=20000 width=164) (actual time=159.007..159.007 rows=19837 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 4107kB Buffers: shared hit=10903 -> Nested Loop (cost=332.07..3602.20 rows=20000 width=164) (actual time=0.294..147.858 rows=19837 loops=1) Buffers: shared hit=10903 -> Hash Join (cost=1.07..2.47 rows=5 width=30) (actual time=0.020..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..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.010..0.010 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=0.005..0.007 rows=1 loops=1) Filter: (r_name = 'AFRICA'::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..28.703 rows=3967 loops=5) Recheck Cond: (s_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 96033 Heap Blocks: lossy=10895 Buffers: shared hit=10901 -> Bitmap Index Scan on supplier_s_nationkey_s_suppkey_brin_idx (cost=0.00..330.00 rows=4000 width=0) (actual time=0.240..0.240 rows=23040 loops=5) Index Cond: (s_nationkey = nation.n_nationkey) Buffers: shared hit=6 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.060..0.060 rows=1 loops=6161) Buffers: shared hit=147312 read=7630 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.039..0.055 rows=2 loops=6161) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=147312 read=7630 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6161) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6161 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.051 rows=4 loops=6161) Buffers: shared hit=141151 read=7630 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.042 rows=4 loops=6161) Buffers: shared hit=91863 read=7630 -> 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=6161) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=17822 read=7630 -> 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=24644) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=74041 -> 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=24644) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49288 Planning time: 4.905 ms Execution time: 7037.531 ms (75 rows) COMMIT; COMMIT