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 = 'EUROPE' 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=2420980.74..2420980.80 rows=25 width=34) (actual time=70954.674..70954.675 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1160623 read=313938 dirtied=19 written=199 -> HashAggregate (cost=2420979.91..2420980.16 rows=25 width=34) (actual time=70954.595..70954.597 rows=5 loops=1) Buffers: shared hit=1160620 read=313938 dirtied=19 written=199 -> Hash Join (cost=398002.39..2420255.83 rows=72408 width=34) (actual time=12095.571..70813.067 rows=72634 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1160620 read=313938 dirtied=19 written=199 -> Hash Join (cost=393323.39..2378600.79 rows=1812598 width=46) (actual time=11987.257..66809.048 rows=1822382 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1158488 read=313888 dirtied=19 written=199 -> Seq Scan on lineitem (cost=0.00..1666925.96 rows=60045096 width=16) (actual time=0.023..17313.661 rows=59985329 loops=1) Buffers: shared hit=787573 read=278902 written=9 -> Hash (cost=387657.63..387657.63 rows=453261 width=38) (actual time=11986.462..11986.462 rows=455662 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32039kB Buffers: shared hit=370915 read=34986 dirtied=19 written=190 -> Hash Join (cost=87109.76..387657.63 rows=453261 width=38) (actual time=2960.218..11650.653 rows=455662 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=370915 read=34986 dirtied=19 written=190 -> Bitmap Heap Scan on orders (cost=48067.54..335584.15 rows=2266307 width=8) (actual time=1342.408..4394.958 rows=2275583 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=232248 read=27475 dirtied=19 written=190 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47500.97 rows=2266307 width=0) (actual time=1133.616..1133.616 rows=2277830 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 hit=6209 read=12 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1617.138..1617.138 rows=300963 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21162kB Buffers: shared hit=138667 read=7511 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=29.574..1411.372 rows=300963 loops=1) Buffers: shared hit=138667 read=7511 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.080..0.163 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=0.016..0.048 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..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=0.028..0.029 rows=1 loops=1) Filter: (r_name = 'EUROPE'::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=29.290..259.459 rows=60193 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=138664 read=7511 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.768..19.768 rows=60193 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=244 read=595 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=106.850..106.850 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2129 read=50 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.007..56.260 rows=100000 loops=1) Buffers: shared hit=2129 read=50 Total runtime: 70964.790 ms (55 rows) COMMIT; COMMIT