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 = 20 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=809034.30..809034.31 rows=1 width=190) (actual time=11036.030..11036.056 rows=100 loops=1) Buffers: shared hit=1520910 read=340907 written=55 -> Sort (cost=809034.30..809034.31 rows=1 width=190) (actual time=11036.029..11036.038 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=1520910 read=340907 written=55 -> Merge Join (cost=381554.45..809034.29 rows=1 width=190) (actual time=8295.534..11029.841 rows=4762 loops=1) Merge Cond: (part.p_partkey = partsupp.ps_partkey) Join Filter: (partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1678 Buffers: shared hit=1520902 read=340907 written=55 -> Index Scan using pk_part on part (cost=0.43..102473.43 rows=8154 width=30) (actual time=0.255..1232.028 rows=8140 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 20)) Rows Removed by Filter: 1991860 Buffers: shared hit=756 read=45985 -> Sort (cost=381554.03..385551.87 rows=1599136 width=168) (actual time=8294.887..8705.450 rows=1586835 loops=1) Sort Key: partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1363147 read=289921 written=55 -> Nested Loop (cost=2.00..216772.17 rows=1599136 width=168) (actual time=0.072..6774.625 rows=1586960 loops=1) Buffers: shared hit=1363147 read=289921 written=55 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.056..106.299 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=0.006..0.017 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=0.046..90.845 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=0.007..34.321 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.022..0.022 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=0.004..0.012 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..0.313 rows=80 loops=19837) Index Cond: (ps_suppkey = supplier.s_suppkey) Buffers: shared hit=1360966 read=289921 written=55 SubPlan 1 -> Aggregate (cost=48.83..48.84 rows=1 width=4) (actual time=0.059..0.059 rows=1 loops=6440) Buffers: shared hit=156999 read=5001 -> Nested Loop (cost=0.86..48.83 rows=1 width=4) (actual time=0.038..0.057 rows=2 loops=6440) Join Filter: (nation_1.n_regionkey = region_1.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=156999 read=5001 -> Seq Scan on region region_1 (cost=0.00..1.06 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=6440) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6440 -> Nested Loop (cost=0.86..47.71 rows=4 width=8) (actual time=0.025..0.053 rows=4 loops=6440) Buffers: shared hit=150559 read=5001 -> Nested Loop (cost=0.72..47.04 rows=4 width=8) (actual time=0.023..0.044 rows=4 loops=6440) Buffers: shared hit=99040 read=5000 -> Index Scan using pk_partsupp on partsupp partsupp_1 (cost=0.43..13.75 rows=4 width=8) (actual time=0.016..0.017 rows=4 loops=6440) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21619 read=5000 -> Index Scan using pk_supplier on supplier supplier_1 (cost=0.29..8.31 rows=1 width=8) (actual time=0.005..0.006 rows=1 loops=25760) Index Cond: (s_suppkey = partsupp_1.ps_suppkey) Buffers: shared hit=77421 -> 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=25760) Index Cond: (n_nationkey = supplier_1.s_nationkey) Buffers: shared hit=51519 read=1 Planning time: 5.930 ms Execution time: 11067.512 ms (68 rows) COMMIT; COMMIT