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 '1995-01-01'
	and o_orderdate < date '1995-01-01' + interval '1 year'
group by
	n_name
order by
	revenue desc;
                                                                                              QUERY PLAN                                                                                               
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Sort  (cost=2436443.48..2436443.54 rows=25 width=34) (actual time=114460.717..114460.717 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=873258 read=609171 written=4
   ->  HashAggregate  (cost=2436442.65..2436442.90 rows=25 width=34) (actual time=114460.641..114460.643 rows=5 loops=1)
         Buffers: shared hit=873255 read=609171 written=4
         ->  Hash Join  (cost=401179.15..2435711.21 rows=73144 width=34) (actual time=17596.456..114175.636 rows=72804 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=873255 read=609171 written=4
               ->  Hash Join  (cost=396500.15..2393717.71 rows=1829153 width=46) (actual time=17444.034..109360.053 rows=1818008 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=871073 read=609171 written=4
                     ->  Seq Scan on lineitem  (cost=0.00..1676902.68 rows=60404668 width=16) (actual time=0.029..45075.525 rows=60045310 loops=1)
                           Buffers: shared hit=470122 read=602734 written=4
                     ->  Hash  (cost=390782.61..390782.61 rows=457403 width=38) (actual time=17443.175..17443.175 rows=454909 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 31986kB
                           Buffers: shared hit=400951 read=6437
                           ->  Hash Join  (cost=88286.07..390782.61 rows=457403 width=38) (actual time=4407.413..16991.653 rows=454909 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=400951 read=6437
                                 ->  Bitmap Heap Scan on orders  (cost=49243.85..338590.06 rows=2287014 width=8) (actual time=1924.415..8378.423 rows=2277632 loops=1)
                                       Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone))
                                       Buffers: shared hit=255012 read=6437
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..48672.09 rows=2287014 width=0) (actual time=1800.890..1800.890 rows=2291364 loops=1)
                                             Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone))
                                             Buffers: shared hit=2 read=6426
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=2482.680..2482.680 rows=299436 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21055kB
                                       Buffers: shared hit=145939
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=32.988..2271.433 rows=299436 loops=1)
                                             Buffers: shared hit=145939
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.105..0.217 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=0.050..0.089 rows=25 loops=1)
                                                         Buffers: shared hit=2
                                                   ->  Materialize  (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=25)
                                                         Buffers: shared hit=1
                                                         ->  Seq Scan on region  (cost=0.00..1.06 rows=1 width=4) (actual time=0.031..0.032 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=27.930..428.857 rows=59887 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=145936
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=19.509..19.509 rows=59887 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=834
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=152.090..152.090 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=0.009..105.721 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 114476.025 ms
(55 rows)

COMMIT;
COMMIT