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 = 25 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=811868.07..811868.07 rows=1 width=190) (actual time=8881.474..8881.497 rows=100 loops=1) Buffers: shared hit=1720379 read=136180 written=6626 -> Sort (cost=811868.07..811868.07 rows=1 width=190) (actual time=8881.472..8881.486 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=1720379 read=136180 written=6626 -> Merge Join (cost=381648.19..811868.06 rows=1 width=190) (actual time=6355.975..8875.651 rows=4589 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1645 Buffers: shared hit=1720371 read=136180 written=6626 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8181 width=30) (actual time=0.033..1300.781 rows=7885 loops=1) Filter: (((p_type)::text ~~ '%TIN'::text) AND (p_size = 25)) Rows Removed by Filter: 1992115 Buffers: shared hit=756 read=45985 written=211 -> Sort (cost=381647.76..385647.76 rows=1600000 width=168) (actual time=6355.698..6707.157 rows=1586797 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1568451 read=84617 written=6400 -> Nested Loop (cost=2.00..216770.64 rows=1600000 width=168) (actual time=0.065..4606.753 rows=1586960 loops=1) Buffers: shared hit=1568451 read=84617 written=6400 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.051..104.465 rows=19837 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 80163 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.009 rows=1 loops=1) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.041..89.724 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..35.210 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.019..0.019 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=0.003..0.006 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=0.017..0.206 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1566270 read=84617 written=6400 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.063..0.063 rows=1 loops=6234) Buffers: shared hit=151164 read=5578 written=15 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.040..0.061 rows=2 loops=6234) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=151164 read=5578 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=6234) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6234 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.028..0.057 rows=4 loops=6234) Buffers: shared hit=144930 read=5578 written=15 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.025..0.047 rows=4 loops=6234) Buffers: shared hit=95059 read=5577 written=15 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.018..0.019 rows=4 loops=6234) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=20153 read=5577 written=15 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.006..0.006 rows=1 loops=24936) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=74906 -> 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=24936) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=49871 read=1 Planning time: 6.111 ms Execution time: 8928.024 ms (68 rows) COMMIT; COMMIT