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=2421501.61..2421501.67 rows=25 width=34) (actual time=80787.666..80787.667 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1007078 read=467565 dirtied=25 written=4318 -> HashAggregate (cost=2421500.78..2421501.03 rows=25 width=34) (actual time=80787.610..80787.612 rows=5 loops=1) Buffers: shared hit=1007075 read=467565 dirtied=25 written=4318 -> Hash Join (cost=398326.88..2420773.39 rows=72739 width=34) (actual time=14426.785..80623.465 rows=72757 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1007075 read=467565 dirtied=25 written=4318 -> Hash Join (cost=393647.88..2378997.76 rows=1818462 width=46) (actual time=14317.326..76758.014 rows=1825100 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1005372 read=467086 dirtied=25 written=4318 -> Seq Scan on lineitem (cost=0.00..1666935.17 rows=60046017 width=16) (actual time=0.010..19558.436 rows=59985329 loops=1) Buffers: shared hit=663960 read=402515 written=7 -> Hash (cost=387963.87..387963.87 rows=454721 width=38) (actual time=14316.716..14316.716 rows=456416 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32092kB Buffers: shared hit=341412 read=64571 dirtied=25 written=4311 -> Hash Join (cost=87264.56..387963.87 rows=454721 width=38) (actual time=3677.159..13402.484 rows=456416 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=341412 read=64571 dirtied=25 written=4311 -> Bitmap Heap Scan on orders (cost=48222.35..335848.42 rows=2273605 width=8) (actual time=1817.130..5450.112 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)) Buffers: shared hit=206076 read=53668 dirtied=25 written=4311 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47653.95 rows=2273605 width=0) (actual time=1622.662..1622.662 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=2 read=6237 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1859.727..1859.727 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=135336 read=10903 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=39.108..1646.788 rows=300270 loops=1) Buffers: shared hit=135336 read=10903 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.056..0.176 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=0.011..0.052 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=0.022..0.023 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=43.294..304.801 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=135333 read=10903 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.283..30.283 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=14 read=822 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=108.531..108.531 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=1700 read=479 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.012..64.490 rows=100000 loops=1) Buffers: shared hit=1700 read=479 Total runtime: 80802.568 ms (55 rows) COMMIT; COMMIT