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 '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=2454078.79..2454078.85 rows=25 width=34) (actual time=86585.555..86585.556 rows=5 loops=1)
   Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount))))
   Sort Method: quicksort  Memory: 25kB
   Buffers: shared hit=1057450 read=434684 written=5
   ->  HashAggregate  (cost=2454077.96..2454078.21 rows=25 width=34) (actual time=86585.474..86585.477 rows=5 loops=1)
         Buffers: shared hit=1057447 read=434684 written=5
         ->  Hash Join  (cost=404453.89..2453338.59 rows=73937 width=34) (actual time=12926.772..86367.946 rows=73244 loops=1)
               Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey))
               Buffers: shared hit=1057447 read=434684 written=5
               ->  Hash Join  (cost=399774.89..2410951.62 rows=1848430 width=46) (actual time=12810.327..82417.572 rows=1827174 loops=1)
                     Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
                     Buffers: shared hit=1055265 read=434684 written=5
                     ->  Seq Scan on lineitem  (cost=0.00..1688567.95 rows=60824895 width=16) (actual time=0.051..22253.005 rows=60045033 loops=1)
                           Buffers: shared hit=688339 read=391980 written=5
                     ->  Hash  (cost=393997.16..393997.16 rows=462219 width=38) (actual time=12809.738..12809.738 rows=456471 loops=1)
                           Buckets: 65536  Batches: 1  Memory Usage: 32096kB
                           Buffers: shared hit=366926 read=42704
                           ->  Hash Join  (cost=89228.94..393997.16 rows=462219 width=38) (actual time=3406.751..12429.215 rows=456471 loops=1)
                                 Hash Cond: (orders.o_custkey = customer.c_custkey)
                                 Buffers: shared hit=366926 read=42704
                                 ->  Bitmap Heap Scan on orders  (cost=50186.72..341666.14 rows=2311095 width=8) (actual time=1824.606..5007.394 rows=2277467 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=256793 read=6598
                                       ->  Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx  (cost=0.00..49608.94 rows=2311095 width=0) (actual time=1687.952..1687.952 rows=2307415 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 read=6598
                                 ->  Hash  (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1581.930..1581.930 rows=300270 loops=1)
                                       Buckets: 32768  Batches: 1  Memory Usage: 21113kB
                                       Buffers: shared hit=110133 read=36106
                                       ->  Nested Loop  (cost=905.09..35292.22 rows=300000 width=38) (actual time=31.782..1412.027 rows=300270 loops=1)
                                             Buffers: shared hit=110133 read=36106
                                             ->  Nested Loop  (cost=0.00..14.07 rows=5 width=30) (actual time=0.055..0.266 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=0.008..0.178 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=0.023..0.024 rows=1 loops=1)
                                                               Filter: (r_name = 'ASIA'::bpchar)
                                                               Rows Removed by Filter: 4
                                                               Buffers: shared hit=1
                                             ->  Bitmap Heap Scan on customer  (cost=905.09..6455.63 rows=60000 width=8) (actual time=25.962..263.841 rows=60054 loops=5)
                                                   Recheck Cond: (c_nationkey = nation.n_nationkey)
                                                   Buffers: shared hit=110130 read=36106
                                                   ->  Bitmap Index Scan on customer_c_nationkey_c_custkey_idx  (cost=0.00..890.09 rows=60000 width=0) (actual time=17.269..17.269 rows=60054 loops=5)
                                                         Index Cond: (c_nationkey = nation.n_nationkey)
                                                         Buffers: shared hit=5 read=831
               ->  Hash  (cost=3179.00..3179.00 rows=100000 width=8) (actual time=114.867..114.867 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=0.018..71.437 rows=100000 loops=1)
                           Buffers: shared hit=2179
 Total runtime: 86610.454 ms
(55 rows)

COMMIT;
COMMIT