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 '1996-01-01' and o_orderdate < date '1996-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2454284.61..2454284.67 rows=25 width=34) (actual time=102526.575..102526.577 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=852193 read=639954 dirtied=1 written=72 -> HashAggregate (cost=2454283.78..2454284.03 rows=25 width=34) (actual time=102526.493..102526.497 rows=5 loops=1) Buffers: shared hit=852190 read=639954 dirtied=1 written=72 -> Hash Join (cost=404587.38..2453543.47 rows=74031 width=34) (actual time=14162.874..102248.598 rows=72837 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=852190 read=639954 dirtied=1 written=72 -> Hash Join (cost=399908.38..2411109.00 rows=1850758 width=46) (actual time=14027.531..97481.144 rows=1826554 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=850008 read=639954 dirtied=1 written=72 -> Seq Scan on lineitem (cost=0.00..1688568.36 rows=60824936 width=16) (actual time=0.024..32077.261 rows=60045033 loops=1) Buffers: shared hit=500131 read=580188 dirtied=1 -> Hash (cost=394123.37..394123.37 rows=462801 width=38) (actual time=14026.966..14026.966 rows=456770 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32117kB Buffers: shared hit=349877 read=59766 written=72 -> Hash Join (cost=89294.76..394123.37 rows=462801 width=38) (actual time=2899.932..13445.638 rows=456770 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=349877 read=59766 written=72 -> Bitmap Heap Scan on orders (cost=50252.54..341775.62 rows=2314005 width=8) (actual time=1361.879..5695.922 rows=2284198 loops=1) Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=220988 read=42416 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49674.04 rows=2314005 width=0) (actual time=1217.051..1217.051 rows=2313800 loops=1) Index Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6608 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1537.569..1537.569 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=128889 read=17350 written=72 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=31.566..1346.290 rows=300270 loops=1) Buffers: shared hit=128889 read=17350 written=72 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.078..0.194 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=0.015..0.069 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=0.034..0.035 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=35.086..247.675 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=128886 read=17350 written=72 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=23.956..23.956 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=133.366..133.366 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=0.013..85.579 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 102551.909 ms (55 rows) COMMIT; COMMIT