BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue from customer, orders, lineitem, supplier, nation, region where c_custkey = o_custkey and l_orderkey = o_orderkey and l_suppkey = s_suppkey and c_nationkey = s_nationkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'AMERICA' and o_orderdate >= date '1993-01-01' and o_orderdate < date '1993-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2457126.75..2457126.81 rows=25 width=34) (actual time=132706.709..132706.710 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1121683 read=372155 dirtied=582 written=4716 -> HashAggregate (cost=2457125.92..2457126.17 rows=25 width=34) (actual time=132706.622..132706.625 rows=5 loops=1) Buffers: shared hit=1121680 read=372155 dirtied=582 written=4716 -> Hash Join (cost=404424.12..2456388.23 rows=73769 width=34) (actual time=38909.241..132461.120 rows=71959 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1121680 read=372155 dirtied=582 written=4716 -> Hash Join (cost=399745.12..2414080.94 rows=1844530 width=46) (actual time=38714.597..127780.971 rows=1815733 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1119498 read=372155 dirtied=582 written=4716 -> Seq Scan on lineitem (cost=0.00..1691279.33 rows=60922233 width=16) (actual time=0.022..40370.860 rows=59984748 loops=1) Buffers: shared hit=879344 read=202713 dirtied=582 written=581 -> Hash (cost=393983.11..393983.11 rows=460961 width=38) (actual time=38713.692..38713.692 rows=453555 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 31891kB Buffers: shared hit=240154 read=169442 written=4135 -> Hash Join (cost=89092.44..393983.11 rows=460961 width=38) (actual time=10375.190..38183.968 rows=453555 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=240154 read=169442 written=4135 -> Bitmap Heap Scan on orders (cost=50050.23..341688.27 rows=2304803 width=8) (actual time=2837.755..22644.037 rows=2277137 loops=1) Recheck Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=130315 read=133342 written=2779 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49474.03 rows=2304803 width=0) (actual time=2682.267..2682.267 rows=2310711 loops=1) Index Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6603 written=295 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=7537.088..7537.088 rows=299436 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21055kB Buffers: shared hit=109839 read=36100 written=1356 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=40.597..7247.485 rows=299436 loops=1) Buffers: shared hit=109839 read=36100 written=1356 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.051..0.167 rows=5 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 20 Buffers: shared hit=3 -> Index Scan using pk_nation on nation (cost=0.00..12.63 rows=25 width=34) (actual time=0.010..0.056 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..0.002 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.025..0.025 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=47.088..1421.390 rows=59887 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=109836 read=36100 written=1356 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=35.575..35.575 rows=59887 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=7 read=827 written=20 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=191.758..191.758 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.013..143.048 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 132724.865 ms (55 rows) COMMIT; COMMIT