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 '1993-01-01' and o_orderdate < date '1993-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2424321.56..2424321.62 rows=25 width=34) (actual time=102921.539..102921.539 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=738822 read=737136 dirtied=253 written=381 -> HashAggregate (cost=2424320.73..2424320.98 rows=25 width=34) (actual time=102921.460..102921.466 rows=5 loops=1) Buffers: shared hit=738819 read=737136 dirtied=253 written=381 -> Hash Join (cost=398956.93..2423590.65 rows=73008 width=34) (actual time=23822.290..102727.006 rows=73184 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=738819 read=737136 dirtied=253 written=381 -> Hash Join (cost=394277.93..2381666.81 rows=1825738 width=46) (actual time=23700.647..98417.345 rows=1823718 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=736637 read=737136 dirtied=253 written=381 -> Seq Scan on lineitem (cost=0.00..1668603.00 rows=60105700 width=16) (actual time=0.045..27813.357 rows=60045603 loops=1) Buffers: shared hit=625373 read=442173 written=2 -> Hash (cost=388571.15..388571.15 rows=456542 width=38) (actual time=23699.924..23699.924 rows=456164 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32075kB Buffers: shared hit=111264 read=294963 dirtied=253 written=379 -> Hash Join (cost=87429.90..388571.15 rows=456542 width=38) (actual time=6413.394..22939.509 rows=456164 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=111264 read=294963 dirtied=253 written=379 -> Bitmap Heap Scan on orders (cost=48387.68..336403.35 rows=2282711 width=8) (actual time=3943.012..13138.390 rows=2278999 loops=1) Recheck Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=1080 read=258908 dirtied=253 written=355 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47817.01 rows=2282711 width=0) (actual time=3778.336..3778.336 rows=2281190 loops=1) Index Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=324 read=5901 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=2469.960..2469.960 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=110184 read=36055 written=24 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=41.645..2269.613 rows=300270 loops=1) Buffers: shared hit=110184 read=36055 written=24 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.068..0.172 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=0.009..0.053 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=0.028..0.029 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=36.882..433.801 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=110181 read=36055 written=24 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.509..25.509 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=119.840..119.840 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..76.064 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 102945.586 ms (55 rows) COMMIT; COMMIT