BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select supp_nation, cust_nation, l_year, sum(volume) as revenue from ( select n1.n_name as supp_nation, n2.n_name as cust_nation, extract(year from l_shipdate) as l_year, l_extendedprice * (1 - l_discount) as volume from supplier, lineitem, orders, customer, nation n1, nation n2 where s_suppkey = l_suppkey and o_orderkey = l_orderkey and c_custkey = o_custkey and s_nationkey = n1.n_nationkey and c_nationkey = n2.n_nationkey and ( (n1.n_name = 'EGYPT' and n2.n_name = 'BRAZIL') or (n1.n_name = 'BRAZIL' and n2.n_name = 'EGYPT') ) and l_shipdate between date '1995-01-01' and date '1996-12-31' ) as shipping group by supp_nation, cust_nation, l_year order by supp_nation, cust_nation, l_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- GroupAggregate (cost=2352727.56..2354622.73 rows=58313 width=64) (actual time=43074.901..43097.090 rows=4 loops=1) Buffers: shared hit=338615 read=1088287 -> Sort (cost=2352727.56..2352873.34 rows=58313 width=64) (actual time=43067.408..43070.959 rows=58201 loops=1) Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone)) Sort Method: quicksort Memory: 9721kB Buffers: shared hit=338615 read=1088287 -> Hash Join (cost=894575.28..2348111.64 rows=58313 width=64) (actual time=15890.446..42859.857 rows=58201 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=338607 read=1088287 -> Hash Join (cost=889896.28..2313363.60 rows=1459717 width=72) (actual time=15826.521..40867.762 rows=1461386 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=336425 read=1088287 -> Bitmap Heap Scan on lineitem (cost=387274.84..1727665.95 rows=18261074 width=20) (actual time=6008.682..19695.237 rows=18248249 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=24614 read=1088097 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382709.57 rows=18261074 width=0) (actual time=5629.446..5629.446 rows=18248249 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=487618.47..487618.47 rows=1200238 width=60) (actual time=9816.946..9816.946 rows=1201553 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107953kB Buffers: shared hit=311811 read=190 -> Hash Join (cost=15638.06..487618.47 rows=1200238 width=60) (actual time=296.255..9364.046 rows=1201553 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311811 read=190 -> Seq Scan on orders (cost=0.00..403671.84 rows=15014984 width=8) (actual time=0.021..3225.561 rows=15015000 loops=1) Buffers: shared hit=253501 read=21 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=296.108..296.108 rows=119921 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10775kB Buffers: shared hit=58310 read=169 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=16.259..257.141 rows=119921 loops=1) Buffers: shared hit=58310 read=169 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.102..0.348 rows=2 loops=1) Join Filter: (((n1.n_name = 'EGYPT'::bpchar) AND (n2.n_name = 'BRAZIL'::bpchar)) OR ((n1.n_name = 'BRAZIL'::bpchar) AND (n2.n_name = 'EGYPT'::bpchar))) Rows Removed by Join Filter: 623 Buffers: shared hit=3 -> Index Scan using pk_nation on nation n1 (cost=0.00..12.63 rows=25 width=30) (actual time=0.021..0.045 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.003 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.007..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=16.133..118.152 rows=59960 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58307 read=169 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=10.443..10.443 rows=59960 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=169 read=166 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=62.882..62.882 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..35.294 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 43111.179 ms (53 rows) COMMIT; COMMIT