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 = 'ASIA'
	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=1859653.94..1859654.00 rows=25 width=34) (actual time=21120.884..21120.884 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=2165521 read=557436 written=13496
   ->  HashAggregate  (cost=1859653.11..1859653.36 rows=25 width=34) (actual time=21120.817..21120.820 rows=5 loops=1)
         Group Key: nation.n_name
         Buffers: shared hit=2165518 read=557436 written=13496
         ->  Hash Join  (cost=92393.60..1858918.90 rows=73421 width=34) (actual time=3964.619..21024.940 rows=72757 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=2165518 read=557436 written=13496
               ->  Nested Loop  (cost=87714.60..1839739.18 rows=1835534 width=46) (actual time=3848.443..19532.609 rows=1825100 loops=1)
                     Buffers: shared hit=2163996 read=556776 written=13496
                     ->  Hash Join  (cost=87714.04..388856.65 rows=458994 width=38) (actual time=3848.393..9595.492 rows=456416 loops=1)
                           Hash Cond: (orders.o_custkey = customer.c_custkey)
                           Buffers: shared hit=234922 read=171059 written=4151
                           ->  Bitmap Heap Scan on orders  (cost=48671.87..336618.40 rows=2294969 width=8) (actual time=1864.196..5567.619 rows=2281857 loops=1)
                                 Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone))
                                 Heap Blocks: exact=253505
                                 Buffers: shared hit=99301 read=160442 written=4151
                                 ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..48098.12 rows=2294969 width=0) (actual time=1629.758..1629.758 rows=2284131 loops=1)
                                       Index Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone))
                                       Buffers: shared hit=1 read=6237
                           ->  Hash  (cost=35292.17..35292.17 rows=300000 width=38) (actual time=1980.350..1980.350 rows=300270 loops=1)
                                 Buckets: 524288  Batches: 1  Memory Usage: 25209kB
                                 Buffers: shared hit=135621 read=10617
                                 ->  Nested Loop  (cost=905.25..35292.17 rows=300000 width=38) (actual time=41.873..1812.232 rows=300270 loops=1)
                                       Buffers: shared hit=135621 read=10617
                                       ->  Nested Loop  (cost=0.14..13.95 rows=5 width=30) (actual time=0.060..0.183 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=0.014..0.072 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=0.015..0.016 rows=1 loops=1)
                                                         Filter: (r_name = 'ASIA'::bpchar)
                                                         Rows Removed by Filter: 4
                                                         Buffers: shared hit=1
                                       ->  Bitmap Heap Scan on customer  (cost=905.11..6455.64 rows=60000 width=8) (actual time=33.617..343.900 rows=60054 loops=5)
                                             Recheck Cond: (c_nationkey = nation.n_nationkey)
                                             Heap Blocks: exact=145400
                                             Buffers: shared hit=135618 read=10617
                                             ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.11 rows=60000 width=0) (actual time=24.023..24.023 rows=60054 loops=5)
                                                   Index Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=10 read=825
                     ->  Index Scan using lineitem_l_orderkey_idx on lineitem  (cost=0.56..3.01 rows=15 width=16) (actual time=0.018..0.020 rows=4 loops=456416)
                           Index Cond: (l_orderkey = orders.o_orderkey)
                           Buffers: shared hit=1929074 read=385717 written=9345
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=115.005..115.005 rows=100000 loops=1)
                     Buckets: 131072  Batches: 1  Memory Usage: 4931kB
                     Buffers: shared hit=1519 read=660
                     ->  Seq Scan on supplier  (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.013..73.305 rows=100000 loops=1)
                           Buffers: shared hit=1519 read=660
 Planning time: 6.977 ms
 Execution time: 21123.361 ms
(56 rows)

COMMIT;
COMMIT