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 = 21 and p_type like '%NICKEL' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' 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 = 'ASIA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=888469.98..888469.98 rows=1 width=190) (actual time=7469.815..7469.837 rows=100 loops=1) Buffers: shared hit=287937 read=105165 written=275 -> Sort (cost=888469.98..888469.98 rows=1 width=190) (actual time=7469.813..7469.825 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=287937 read=105165 written=275 -> Merge Join (cost=465676.21..888469.97 rows=1 width=190) (actual time=5563.907..7464.822 rows=4804 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1737 Buffers: shared hit=287929 read=105165 written=275 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8073 width=30) (actual time=0.222..1155.551 rows=8094 loops=1) Filter: (((p_type)::text ~~ '%NICKEL'::text) AND (p_size = 21)) Rows Removed by Filter: 1991906 Buffers: shared hit=756 read=45985 -> Sort (cost=465675.78..469675.54 rows=1599904 width=168) (actual time=5561.173..5680.618 rows=1602795 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 474939kB Buffers: shared hit=127079 read=54782 written=275 -> Hash Join (cost=3852.20..300809.24 rows=1599904 width=168) (actual time=159.965..4472.553 rows=1602960 loops=1) Hash Cond: (partsupp.ps_suppkey = supplier.s_suppkey) Buffers: shared hit=127079 read=54782 written=275 -> Seq Scan on partsupp (cost=0.00..250958.00 rows=8000000 width=12) (actual time=0.003..2041.724 rows=8000000 loops=1) Buffers: shared hit=116177 read=54781 written=275 -> Hash (cost=3602.20..3602.20 rows=20000 width=164) (actual time=159.827..159.827 rows=20037 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 4154kB Buffers: shared hit=10902 read=1 -> Nested Loop (cost=332.07..3602.20 rows=20000 width=164) (actual time=0.315..148.319 rows=20037 loops=1) Buffers: shared hit=10902 read=1 -> Hash Join (cost=1.07..2.47 rows=5 width=30) (actual time=0.022..0.041 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..0.005 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=0.006..0.007 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=0.260..28.801 rows=4007 loops=5) Recheck Cond: (s_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 95993 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=0.244..0.244 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=0.052..0.052 rows=1 loops=6541) Buffers: shared hit=160094 read=4398 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.032..0.047 rows=2 loops=6541) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=160094 read=4398 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=6541) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6541 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.021..0.043 rows=4 loops=6541) Buffers: shared hit=153553 read=4398 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.019..0.034 rows=4 loops=6541) Buffers: shared hit=101225 read=4398 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.014..0.015 rows=4 loops=6541) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22587 read=4398 -> 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=26164) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=78638 -> 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=26164) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=52328 Planning time: 4.979 ms Execution time: 7502.286 ms (75 rows) COMMIT; COMMIT