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 '1994-01-01' and o_orderdate < date '1994-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2427096.32..2427096.38 rows=25 width=34) (actual time=71747.301..71747.302 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=760662 read=716517 written=19 -> HashAggregate (cost=2427095.49..2427095.74 rows=25 width=34) (actual time=71747.221..71747.222 rows=5 loops=1) Buffers: shared hit=760659 read=716517 written=19 -> Hash Join (cost=399559.36..2426363.32 rows=73217 width=34) (actual time=12608.355..71613.981 rows=73045 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=760659 read=716517 written=19 -> Hash Join (cost=394880.36..2384302.77 rows=1832469 width=46) (actual time=12525.641..67821.695 rows=1817189 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=759893 read=715101 written=19 -> Seq Scan on lineitem (cost=0.00..1670267.83 rows=60165983 width=16) (actual time=0.027..15528.178 rows=60045379 loops=1) Buffers: shared hit=456140 read=612468 -> Hash (cost=389152.58..389152.58 rows=458222 width=38) (actual time=12524.904..12524.904 rows=454699 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 31972kB Buffers: shared hit=303753 read=102633 written=19 -> Hash Join (cost=87584.01..389152.58 rows=458222 width=38) (actual time=2228.385..12230.864 rows=454699 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=303753 read=102633 written=19 -> Bitmap Heap Scan on orders (cost=48541.79..336936.47 rows=2291112 width=8) (actual time=1361.947..4714.511 rows=2278129 loops=1) Recheck Cond: ((o_orderdate >= '1994-01-01'::date) AND (o_orderdate < '1995-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=162202 read=98027 written=19 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47969.02 rows=2291112 width=0) (actual time=1197.146..1197.146 rows=2282837 loops=1) Index Cond: ((o_orderdate >= '1994-01-01'::date) AND (o_orderdate < '1995-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6222 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=865.856..865.856 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=141551 read=4606 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=19.807..721.813 rows=299838 loops=1) Buffers: shared hit=141551 read=4606 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.059..0.149 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=0.017..0.054 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=0.022..0.022 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=21.029..130.364 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=141548 read=4606 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.993..13.993 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=77.198..77.198 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=763 read=1416 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.009..50.430 rows=100000 loops=1) Buffers: shared hit=763 read=1416 Total runtime: 71771.846 ms (55 rows) COMMIT; COMMIT