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=2431481.08..2431481.14 rows=25 width=34) (actual time=65547.852..65547.852 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=572481 read=907440 dirtied=253 written=10 -> HashAggregate (cost=2431480.24..2431480.49 rows=25 width=34) (actual time=65547.795..65547.797 rows=5 loops=1) Buffers: shared hit=572478 read=907440 dirtied=253 written=10 -> Hash Join (cost=400037.62..2430748.41 rows=73183 width=34) (actual time=10732.000..65430.116 rows=73632 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=572478 read=907440 dirtied=253 written=10 -> Hash Join (cost=395358.62..2388705.16 rows=1831621 width=46) (actual time=10664.964..61821.639 rows=1823230 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=570296 read=907440 dirtied=253 written=10 -> Seq Scan on lineitem (cost=0.00..1673600.22 rows=60286022 width=16) (actual time=0.029..14141.170 rows=60046221 loops=1) Buffers: shared hit=251162 read=819578 written=10 -> Hash (cost=389633.51..389633.51 rows=458009 width=38) (actual time=10664.077..10664.077 rows=456063 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32067kB Buffers: shared hit=319134 read=87862 dirtied=253 -> Hash Join (cost=87581.08..389633.51 rows=458009 width=38) (actual time=2104.191..10407.977 rows=456063 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=319134 read=87862 dirtied=253 -> Bitmap Heap Scan on orders (cost=48538.86..337423.54 rows=2290045 width=8) (actual time=927.506..3783.626 rows=2277990 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=209001 read=51756 dirtied=253 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47966.35 rows=2290045 width=0) (actual time=836.627..836.627 rows=2287055 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 hit=2 read=6239 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1176.426..1176.426 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=110133 read=36106 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=19.463..1043.895 rows=300270 loops=1) Buffers: shared hit=110133 read=36106 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.052..0.128 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..0.040 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=0.020..0.020 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=23.773..193.421 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=110130 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=16.050..16.050 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=63.304..63.304 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..38.883 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 65558.173 ms (55 rows) COMMIT; COMMIT