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 = 'MIDDLE EAST' 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=2429027.47..2429027.53 rows=25 width=34) (actual time=87561.271..87561.271 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=803012 read=675480 dirtied=358 written=5 -> HashAggregate (cost=2429026.64..2429026.89 rows=25 width=34) (actual time=87561.145..87561.148 rows=5 loops=1) Buffers: shared hit=803009 read=675480 dirtied=358 written=5 -> Hash Join (cost=399631.08..2428294.78 rows=73186 width=34) (actual time=16735.272..87345.289 rows=72990 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=803009 read=675480 dirtied=358 written=5 -> Hash Join (cost=394952.08..2386291.04 rows=1829644 width=46) (actual time=16615.181..82892.924 rows=1820773 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=800827 read=675480 dirtied=358 written=5 -> Seq Scan on lineitem (cost=0.00..1671917.02 rows=60225102 width=16) (actual time=0.040..22290.292 rows=60045303 loops=1) Buffers: shared hit=492167 read=577499 -> Hash (cost=389233.05..389233.05 rows=457522 width=38) (actual time=16614.408..16614.408 rows=455272 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32012kB Buffers: shared hit=308660 read=97981 dirtied=358 written=5 -> Hash Join (cost=87484.13..389233.05 rows=457522 width=38) (actual time=4259.258..16138.476 rows=455272 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=308660 read=97981 dirtied=358 written=5 -> Bitmap Heap Scan on orders (cost=48441.91..337037.07 rows=2287611 width=8) (actual time=2045.970..7157.695 rows=2277945 loops=1) Recheck Cond: ((o_orderdate >= '1997-01-01'::date) AND (o_orderdate < '1998-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=179725 read=80759 dirtied=358 written=5 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47870.01 rows=2287611 width=0) (actual time=1901.486..1901.486 rows=2284771 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=6221 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=2212.392..2212.392 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=128935 read=17222 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=39.457..1935.543 rows=299838 loops=1) Buffers: shared hit=128935 read=17222 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.066..0.415 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=0.012..0.270 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.003 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.029..0.030 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::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=37.002..360.143 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=128932 read=17222 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.634..25.634 rows=59968 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=832 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=119.129..119.129 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=0.012..71.391 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 87582.257 ms (55 rows) COMMIT; COMMIT