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=2444231.04..2444231.10 rows=25 width=34) (actual time=124089.108..124089.109 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=755487 read=731314 written=2113 -> HashAggregate (cost=2444230.21..2444230.46 rows=25 width=34) (actual time=124089.017..124089.020 rows=5 loops=1) Buffers: shared hit=755484 read=731314 written=2113 -> Hash Join (cost=402751.38..2443495.90 rows=73431 width=34) (actual time=23208.751..123800.581 rows=72918 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=755484 read=731314 written=2113 -> Hash Join (cost=398072.38..2401356.29 rows=1836315 width=46) (actual time=23061.671..118777.008 rows=1815279 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=753302 read=731314 written=2113 -> Seq Scan on lineitem (cost=0.00..1681982.51 rows=60587651 width=16) (actual time=0.037..48179.755 rows=59984384 loops=1) Buffers: shared hit=407337 read=668769 written=5 -> Hash (cost=392332.74..392332.74 rows=459171 width=38) (actual time=23060.799..23060.799 rows=454287 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 31943kB Buffers: shared hit=345965 read=62545 written=2108 -> Hash Join (cost=88892.73..392332.74 rows=459171 width=38) (actual time=6206.922..22625.806 rows=454287 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=345965 read=62545 written=2108 -> Bitmap Heap Scan on orders (cost=49850.51..340089.35 rows=2295856 width=8) (actual time=2071.566..11016.857 rows=2275900 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=229292 read=33061 written=1998 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49276.55 rows=2295856 width=0) (actual time=1915.788..1915.788 rows=2298795 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 hit=1661 read=4913 written=202 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=4135.078..4135.078 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=116673 read=29484 written=110 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=47.952..3880.734 rows=299838 loops=1) Buffers: shared hit=116673 read=29484 written=110 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.106..0.235 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=0.038..0.086 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=0.030..0.031 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=39.840..750.348 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=116670 read=29484 written=110 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.319..30.319 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=145.807..145.807 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..100.348 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 124102.821 ms (55 rows) COMMIT; COMMIT