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 '1994-01-01' and o_orderdate < date '1994-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2434724.19..2434724.25 rows=25 width=34) (actual time=70960.737..70960.738 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=841341 read=639889 dirtied=2 written=2 -> HashAggregate (cost=2434723.36..2434723.61 rows=25 width=34) (actual time=70960.611..70960.619 rows=5 loops=1) Buffers: shared hit=841338 read=639889 dirtied=2 written=2 -> Hash Join (cost=401073.76..2433988.05 rows=73531 width=34) (actual time=13165.168..70828.337 rows=72995 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=841338 read=639889 dirtied=2 written=2 -> Hash Join (cost=396394.76..2391768.58 rows=1840258 width=46) (actual time=13095.471..67107.066 rows=1817205 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=839156 read=639889 dirtied=2 written=2 -> Seq Scan on lineitem (cost=0.00..1675246.82 rows=60344882 width=16) (actual time=0.042..15040.614 rows=60045826 loops=1) Buffers: shared hit=439477 read=632321 written=2 -> Hash (cost=390642.54..390642.54 rows=460177 width=38) (actual time=13094.966..13094.966 rows=454704 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 31972kB Buffers: shared hit=399679 read=7568 dirtied=2 -> Hash Join (cost=88112.20..390642.54 rows=460177 width=38) (actual time=3017.301..12457.762 rows=454704 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=399679 read=7568 dirtied=2 -> Bitmap Heap Scan on orders (cost=49069.98..338370.24 rows=2300884 width=8) (actual time=2076.116..4919.189 rows=2278157 loops=1) Recheck Cond: ((o_orderdate >= '1994-01-01'::date) AND (o_orderdate < '1995-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=254352 read=6738 dirtied=2 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..48494.76 rows=2300884 width=0) (actual time=1780.853..1780.853 rows=2289672 loops=1) Index Cond: ((o_orderdate >= '1994-01-01'::date) AND (o_orderdate < '1995-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6324 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=940.951..940.951 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=145327 read=830 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=21.583..796.233 rows=299838 loops=1) Buffers: shared hit=145327 read=830 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.046..0.104 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=0.006..0.025 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=0.025..0.026 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=21.062..140.740 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=145324 read=830 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=14.101..14.101 rows=59968 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=7 read=830 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=68.570..68.570 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=0.008..42.120 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 70983.092 ms (55 rows) COMMIT; COMMIT