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 = 1 and p_type like '%COPPER' and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' 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 = 'AMERICA' ) order by s_acctbal desc, n_name, s_name, p_partkey LIMIT 100; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=821070.58..821070.58 rows=1 width=190) (actual time=14952.288..14952.324 rows=100 loops=1) Buffers: shared hit=1677893 read=198965 written=3274 -> Sort (cost=821070.58..821070.58 rows=1 width=190) (actual time=14952.284..14952.311 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=1677893 read=198965 written=3274 -> Merge Join (cost=395548.99..821070.57 rows=1 width=190) (actual time=11302.006..14943.754 rows=4683 loops=1) Merge Cond: (part.p_partkey = public.partsupp.ps_partkey) Join Filter: (public.partsupp.ps_supplycost = (SubPlan 1)) Rows Removed by Join Filter: 1646 Buffers: shared hit=1677885 read=198965 written=3274 -> Index Scan using pk_part on part (cost=0.00..102473.47 rows=7899 width=30) (actual time=0.285..1602.309 rows=7949 loops=1) Filter: (((p_type)::text ~~ '%COPPER'::text) AND (p_size = 1)) Rows Removed by Filter: 1992051 Buffers: shared hit=21244 read=25497 written=2907 -> Sort (cost=395548.99..399548.99 rows=1600000 width=168) (actual time=11300.981..11972.183 rows=1603949 loops=1) Sort Key: public.partsupp.ps_partkey Sort Method: quicksort Memory: 475236kB Buffers: shared hit=1502019 read=168834 -> Nested Loop (cost=1.56..230671.86 rows=1600000 width=168) (actual time=0.074..8601.625 rows=1604080 loops=1) Buffers: shared hit=1502019 read=168834 -> Nested Loop (cost=1.56..5806.62 rows=20000 width=164) (actual time=0.060..182.184 rows=20051 loops=1) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 79949 Buffers: shared hit=2181 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.019 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Hash Join (cost=1.56..4555.56 rows=100000 width=168) (actual time=0.048..158.313 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=0.008..50.211 rows=100000 loops=1) Buffers: shared hit=2179 -> Hash (cost=1.25..1.25 rows=25 width=34) (actual time=0.020..0.020 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=0.004..0.008 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=0.029..0.392 rows=80 loops=20051) Index Cond: (ps_suppkey = public.supplier.s_suppkey) Buffers: shared hit=1499838 read=168834 SubPlan 1 -> Aggregate (cost=49.85..49.86 rows=1 width=4) (actual time=0.088..0.088 rows=1 loops=6329) Buffers: shared hit=154622 read=4634 written=367 -> Nested Loop (cost=0.00..49.84 rows=1 width=4) (actual time=0.060..0.085 rows=2 loops=6329) Join Filter: (public.nation.n_regionkey = public.region.r_regionkey) Rows Removed by Join Filter: 2 Buffers: shared hit=154622 read=4634 written=367 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.003..0.004 rows=1 loops=6329) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=6329 -> Nested Loop (cost=0.00..48.73 rows=4 width=8) (actual time=0.042..0.079 rows=4 loops=6329) Buffers: shared hit=148293 read=4634 written=367 -> Nested Loop (cost=0.00..47.61 rows=4 width=8) (actual time=0.038..0.066 rows=4 loops=6329) Buffers: shared hit=97661 read=4634 written=367 -> Index Scan using pk_partsupp on partsupp (cost=0.00..14.45 rows=4 width=8) (actual time=0.027..0.029 rows=4 loops=6329) Index Cond: (part.p_partkey = ps_partkey) Buffers: shared hit=21853 read=4362 written=367 -> Index Scan using pk_supplier on supplier (cost=0.00..8.28 rows=1 width=8) (actual time=0.008..0.008 rows=1 loops=25316) Index Cond: (s_suppkey = public.partsupp.ps_suppkey) Buffers: shared hit=75808 read=272 -> Index Scan using pk_nation on nation (cost=0.00..0.27 rows=1 width=8) (actual time=0.002..0.002 rows=1 loops=25316) Index Cond: (n_nationkey = public.supplier.s_nationkey) Buffers: shared hit=50632 Total runtime: 15050.048 ms (67 rows) COMMIT; COMMIT