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=2446849.02..2446849.08 rows=25 width=34) (actual time=83893.840..83893.841 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=841692 read=646467 written=1032 -> HashAggregate (cost=2446848.19..2446848.44 rows=25 width=34) (actual time=83893.743..83893.745 rows=5 loops=1) Buffers: shared hit=841689 read=646467 written=1032 -> Hash Join (cost=403320.53..2446111.46 rows=73673 width=34) (actual time=13999.609..83714.157 rows=73094 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=841689 read=646467 written=1032 -> Hash Join (cost=398641.53..2403859.91 rows=1841791 width=46) (actual time=13858.967..79818.622 rows=1821777 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=839507 read=646467 written=1032 -> Seq Scan on lineitem (cost=0.00..1683573.65 rows=60645365 width=16) (actual time=0.020..23328.620 rows=59984826 loops=1) Buffers: shared hit=457796 read=619324 written=5 -> Hash (cost=392884.57..392884.57 rows=460557 width=38) (actual time=13858.217..13858.217 rows=455635 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32037kB Buffers: shared hit=381711 read=27143 written=1027 -> Hash Join (cost=89047.76..392884.57 rows=460557 width=38) (actual time=3139.613..13495.242 rows=455635 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=381711 read=27143 written=1027 -> Bitmap Heap Scan on orders (cost=50005.54..340601.33 rows=2302786 width=8) (actual time=1505.728..5474.243 rows=2277049 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=241701 read=20914 written=1027 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49429.85 rows=2302786 width=0) (actual time=1306.001..1306.001 rows=2301704 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=2 read=6571 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1633.453..1633.453 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=140010 read=6229 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=48.705..1400.888 rows=300270 loops=1) Buffers: shared hit=140010 read=6229 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.052..0.165 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..0.047 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=0.021..0.022 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=35.908..250.940 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=140007 read=6229 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=26.152..26.152 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=7 read=829 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=140.407..140.407 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=0.021..92.012 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 83903.670 ms (55 rows) COMMIT; COMMIT