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 = 36 and p_type like '%BRASS' 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=892085.15..892085.15 rows=1 width=190) (actual time=8187.166..8187.190 rows=100 loops=1) Buffers: shared hit=173930 read=212911 written=509 -> Sort (cost=892085.15..892085.15 rows=1 width=190) (actual time=8187.164..8187.183 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=173930 read=212911 written=509 -> Merge Join (cost=465676.21..892085.14 rows=1 width=190) (actual time=6255.770..8182.453 rows=4676 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1614 Buffers: shared hit=173922 read=212911 written=509 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8166 width=30) (actual time=0.101..1144.519 rows=8061 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 36)) Rows Removed by Filter: 1991939 Buffers: shared hit=756 read=45985 written=83 -> Sort (cost=465675.78..469675.54 rows=1599904 width=168) (actual time=6255.410..6374.132 rows=1586726 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=22737 read=159124 written=411 -> Hash Join (cost=3852.20..300809.24 rows=1599904 width=168) (actual time=157.926..5176.190 rows=1586960 loops=1) Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey) Buffers: shared hit=22737 read=159124 written=411 -> Seq Scan on partsupp (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.002..2732.914 rows=8000000 loops=1) Buffers: shared hit=11834 read=159124 written=411 -> Hash (cost=3602.20..3602.20 rows=20000 width=164) (actual time=157.791..157.791 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=0.306..146.777 rows=19837 loops=1) Buffers: shared hit=10903 -> Hash Join (cost=1.07..2.47 rows=5 width=30) (actual time=0.025..0.047 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=0.003..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=0.254..28.532 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=0.241..0.241 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=6290) Buffers: shared hit=150429 read=7802 written=15 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.039..0.055 rows=2 loops=6290) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=150429 read=7802 written=15 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6290) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6290 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.050 rows=4 loops=6290) Buffers: shared hit=144139 read=7802 written=15 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.026..0.042 rows=4 loops=6290) Buffers: shared hit=93819 read=7802 written=15 -> 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=6290) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=18211 read=7802 written=15 -> 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=25160) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=75608 -> 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=25160) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=50320 Planning time: 4.839 ms Execution time: 8202.208 ms (75 rows) COMMIT; COMMIT