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 '1996-01-01' and o_orderdate < date '1996-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1922726.14..1922726.20 rows=25 width=34) (actual time=15108.859..15108.859 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2467180 read=281103 written=390 -> HashAggregate (cost=1922725.31..1922725.56 rows=25 width=34) (actual time=15108.811..15108.811 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2467177 read=281103 written=390 -> Hash Join (cost=88296.49..1921990.03 rows=73528 width=34) (actual time=2231.752..15027.466 rows=73313 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2467177 read=281103 written=390 -> Nested Loop (cost=83617.49..1902766.74 rows=1841201 width=46) (actual time=2166.859..14301.548 rows=1824489 loops=1) Buffers: shared hit=2464995 read=281103 written=390 -> Hash Join (cost=83616.93..441721.52 rows=460419 width=38) (actual time=2166.841..7868.739 rows=456347 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=386670 read=45288 written=60 -> Bitmap Heap Scan on orders (cost=45275.30..390142.84 rows=2302097 width=8) (actual time=27.577..4841.154 rows=2283984 loops=1) Recheck Cond: (o_orderdate >= '1996-01-01'::date) Rows Removed by Index Recheck: 9118788 Filter: (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone) Rows Removed by Filter: 3612228 Heap Blocks: lossy=255548 Buffers: shared hit=210273 read=45286 written=60 -> Bitmap Index Scan on orders_o_orderkey_o_orderdate_brin_idx (cost=0.00..44699.77 rows=5954636 width=0) (actual time=27.412..27.412 rows=2556160 loops=1) Index Cond: (o_orderdate >= '1996-01-01'::date) Buffers: shared hit=3 read=8 -> Hash (cost=34591.63..34591.63 rows=300000 width=38) (actual time=2137.273..2137.273 rows=299436 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25151kB Buffers: shared hit=176397 read=2 -> Nested Loop (cost=765.14..34591.63 rows=300000 width=38) (actual time=4.505..2030.517 rows=299436 loops=1) Buffers: shared hit=176397 read=2 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.033..0.080 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=0.14..12.51 rows=25 width=34) (actual time=0.007..0.028 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..0.001 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.010..0.011 rows=1 loops=1) Filter: (r_name = 'AMERICA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=4.191..396.243 rows=59887 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 1440113 Heap Blocks: lossy=176390 Buffers: shared hit=176394 read=2 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=4.157..4.157 rows=353280 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_lineitem on lineitem (cost=0.56..3.02 rows=15 width=16) (actual time=0.011..0.013 rows=4 loops=456347) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=2078325 read=235815 written=330 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=63.986..63.986 rows=100000 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 4931kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.006..37.559 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 5.436 ms Execution time: 15109.526 ms (60 rows) COMMIT; COMMIT