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=1926686.61..1926686.67 rows=25 width=34) (actual time=14342.222..14342.222 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2519587 read=231635 dirtied=372 written=744 -> HashAggregate (cost=1926685.78..1926686.03 rows=25 width=34) (actual time=14342.181..14342.181 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2519584 read=231635 dirtied=372 written=744 -> Hash Join (cost=88386.06..1925949.03 rows=73675 width=34) (actual time=2230.333..14261.238 rows=72842 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2519584 read=231635 dirtied=372 written=744 -> Nested Loop (cost=83707.06..1906696.73 rows=1844873 width=46) (actual time=2166.330..13544.412 rows=1826607 loops=1) Buffers: shared hit=2517402 read=231635 dirtied=372 written=744 -> Hash Join (cost=83706.50..442520.17 rows=461331 width=38) (actual time=2166.275..7404.485 rows=456771 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=429170 read=3294 written=53 -> Bitmap Heap Scan on orders (cost=45364.86..390915.27 rows=2306655 width=8) (actual time=27.679..4318.795 rows=2284200 loops=1) Recheck Cond: (o_orderdate >= '1996-01-01'::date) Rows Removed by Index Recheck: 9118562 Filter: (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone) Rows Removed by Filter: 3612238 Heap Blocks: lossy=256054 Buffers: shared hit=254606 read=1459 written=8 -> Bitmap Index Scan on orders_o_orderkey_o_orderdate_brin_idx (cost=0.00..44788.20 rows=5966427 width=0) (actual time=27.514..27.514 rows=2561280 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=2136.664..2136.664 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25209kB Buffers: shared hit=174564 read=1835 written=45 -> Nested Loop (cost=765.14..34591.63 rows=300000 width=38) (actual time=4.527..2021.214 rows=300270 loops=1) Buffers: shared hit=174564 read=1835 written=45 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.035..0.089 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..0.032 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..0.010 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=4.124..394.195 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 1439946 Heap Blocks: lossy=176390 Buffers: shared hit=174561 read=1835 written=45 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=4.088..4.088 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=0.010..0.012 rows=4 loops=456771) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=2088232 read=228341 dirtied=372 written=691 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=63.439..63.439 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..37.435 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 5.483 ms Execution time: 14342.869 ms (60 rows) COMMIT; COMMIT