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 = 34 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=828867.83..828867.83 rows=1 width=190) (actual time=15485.899..15485.940 rows=100 loops=1) Buffers: shared hit=1785455 read=73668 written=1 -> Sort (cost=828867.83..828867.83 rows=1 width=190) (actual time=15485.896..15485.920 rows=100 loops=1) Sort Key: public.supplier.s_acctbal, public.nation.n_name, public.supplier.s_name, part.p_partkey Sort Method: top-N heapsort Memory: 51kB Buffers: shared hit=1785455 read=73668 written=1 -> Merge Join (cost=395374.30..828867.82 rows=1 width=190) (actual time=10465.159..15474.393 rows=4673 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1656 Buffers: shared hit=1785447 read=73668 written=1 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=8145 width=30) (actual time=0.376..2510.546 rows=7977 loops=1) Filter: (((p_type)::text ~~ '%BRASS'::text) AND (p_size = 34)) Rows Removed by Filter: 1992023 Buffers: shared hit=868 read=45873 -> Sort (cost=395374.30..399370.35 rows=1598418 width=168) (actual time=10462.332..11013.937 rows=1586816 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 470689kB Buffers: shared hit=1629228 read=23840 written=1 -> Nested Loop (cost=1.56..230671.61 rows=1598418 width=168) (actual time=4.163..8287.415 rows=1586960 loops=1) Buffers: shared hit=1629228 read=23840 written=1 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=4.134..200.497 rows=19837 loops=1) Join Filter: (public.nation.n_regionkey = public.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=0.009..0.020 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=4.117..173.809 rows=100000 loops=1) Hash Cond: (public.supplier.s_nationkey = public.nation.n_nationkey) Buffers: shared hit=2180 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=142) (actual time=0.012..59.052 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=4.073..4.073 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 2kB Buffers: shared hit=1 -> Seq Scan on nation (cost=0.00..1.25 rows=25 width=34) (actual time=0.006..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Index Scan using partsupp_ps_suppkey_idx on partsupp (cost=0.00..10.44 rows=80 width=12) (actual time=0.030..0.375 rows=80 loops=19837) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1627047 read=23840 written=1 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.173..0.173 rows=1 loops=6329) Buffers: shared hit=155351 read=3955 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.115..0.168 rows=2 loops=6329) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=155351 read=3955 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.006..0.008 rows=1 loops=6329) Filter: (r_name = 'AFRICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6329 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.077..0.157 rows=4 loops=6329) Buffers: shared hit=149022 read=3955 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.069..0.132 rows=4 loops=6329) Buffers: shared hit=98390 read=3955 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.045..0.048 rows=4 loops=6329) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=22287 read=3955 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.019..0.019 rows=1 loops=25316) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=76103 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=25316) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50632 Total runtime: 15523.690 ms (67 rows) COMMIT; COMMIT