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 '1997-01-01' and o_orderdate < date '1997-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1865029.07..1865029.13 rows=25 width=34) (actual time=13690.197..13690.198 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2429602 read=293538 dirtied=2 written=172 -> HashAggregate (cost=1865028.24..1865028.49 rows=25 width=34) (actual time=13690.123..13690.125 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2429599 read=293538 dirtied=2 written=172 -> Hash Join (cost=92842.22..1864298.36 rows=72988 width=34) (actual time=2176.155..13607.446 rows=73636 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2429599 read=293538 dirtied=2 written=172 -> Nested Loop (cost=88163.22..1845204.58 rows=1824653 width=46) (actual time=2111.037..12761.915 rows=1823269 loops=1) Buffers: shared hit=2427417 read=293538 dirtied=2 written=172 -> Hash Join (cost=88162.66..390542.10 rows=456274 width=38) (actual time=2110.955..5625.761 rows=456103 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=391239 read=16475 dirtied=2 written=22 -> Bitmap Heap Scan on orders (cost=49120.49..338382.05 rows=2281371 width=8) (actual time=1251.055..3498.634 rows=2278089 loops=1) Recheck Cond: ((o_orderdate >= '1997-01-01'::date) AND (o_orderdate < '1998-01-01 00:00:00'::timestamp without time zone)) Heap Blocks: exact=255023 Buffers: shared hit=246090 read=15386 dirtied=2 written=20 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..48550.14 rows=2281371 width=0) (actual time=1127.127..1127.127 rows=2291649 loops=1) Index Cond: ((o_orderdate >= '1997-01-01'::date) AND (o_orderdate < '1998-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6453 written=16 -> Hash (cost=35292.17..35292.17 rows=300000 width=38) (actual time=856.099..856.099 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25209kB Buffers: shared hit=145149 read=1089 written=2 -> Nested Loop (cost=905.25..35292.17 rows=300000 width=38) (actual time=20.955..729.227 rows=300270 loops=1) Buffers: shared hit=145149 read=1089 written=2 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.050..0.109 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=0.011..0.035 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=0.013..0.013 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=18.751..133.284 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=145146 read=1089 written=2 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.377..12.377 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=830 written=1 -> Index Scan using pk_lineitem on lineitem (cost=0.56..3.04 rows=15 width=16) (actual time=0.012..0.014 rows=4 loops=456103) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=2036178 read=277063 written=150 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=64.296..64.296 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=0.010..38.221 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 7.521 ms Execution time: 13692.333 ms (56 rows) COMMIT; COMMIT