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 '1995-01-01' and o_orderdate < date '1995-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2453509.54..2453509.60 rows=25 width=34) (actual time=116532.739..116532.739 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1088469 read=403583 dirtied=241 written=5 -> HashAggregate (cost=2453508.70..2453508.95 rows=25 width=34) (actual time=116532.653..116532.658 rows=5 loops=1) Buffers: shared hit=1088466 read=403583 dirtied=241 written=5 -> Hash Join (cost=404087.50..2452772.17 rows=73653 width=34) (actual time=19281.733..116270.215 rows=72683 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1088466 read=403583 dirtied=241 written=5 -> Hash Join (cost=399408.50..2410519.10 rows=1841877 width=46) (actual time=19129.923..111622.846 rows=1817737 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1086284 read=403583 dirtied=241 written=5 -> Seq Scan on lineitem (cost=0.00..1688567.55 rows=60824855 width=16) (actual time=0.027..39842.649 rows=60045033 loops=1) Buffers: shared hit=736324 read=343995 written=1 -> Hash (cost=393651.24..393651.24 rows=460581 width=38) (actual time=19129.221..19129.221 rows=454822 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 31980kB Buffers: shared hit=349960 read=59588 dirtied=241 written=4 -> Hash Join (cost=89052.98..393651.24 rows=460581 width=38) (actual time=5364.190..17698.531 rows=454822 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=349960 read=59588 dirtied=241 written=4 -> Bitmap Heap Scan on orders (cost=50010.76..341367.32 rows=2302904 width=8) (actual time=2167.289..7379.013 rows=2277467 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=239908 read=23483 dirtied=241 written=4 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49435.03 rows=2302904 width=0) (actual time=2026.146..2026.146 rows=2307415 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6598 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=3196.465..3196.465 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=110052 read=36105 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=56.566..2694.959 rows=299838 loops=1) Buffers: shared hit=110052 read=36105 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.159..0.294 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=0.013..0.069 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.006..0.007 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.119..0.120 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=39.619..515.986 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=110049 read=36105 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=27.879..27.879 rows=59968 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=832 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=150.509..150.509 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=0.012..103.006 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 116555.025 ms (55 rows) COMMIT; COMMIT