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 = 'MOROCCO' and n2.n_name = 'GERMANY') or (n1.n_name = 'GERMANY' and n2.n_name = 'MOROCCO') ) 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=2348616.86..2350504.46 rows=58080 width=64) (actual time=42104.050..42126.007 rows=4 loops=1) Buffers: shared hit=338915 read=1088005 -> Sort (cost=2348616.86..2348762.06 rows=58080 width=64) (actual time=42096.649..42099.982 rows=58790 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: 9804kB Buffers: shared hit=338915 read=1088005 -> Hash Join (cost=892527.08..2344021.06 rows=58080 width=64) (actual time=16778.861..41872.865 rows=58790 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=338907 read=1088005 -> Hash Join (cost=887848.08..2309430.64 rows=1452011 width=72) (actual time=16719.493..40494.774 rows=1459107 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=336725 read=1088005 -> Bitmap Heap Scan on lineitem (cost=385226.64..1724171.60 rows=18164664 width=20) (actual time=6301.255..18407.717 rows=18248249 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=25049 read=1087662 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380685.47 rows=18164664 width=0) (actual time=5872.343..5872.343 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=10417.239..10417.239 rows=1199122 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107734kB Buffers: shared hit=311676 read=343 -> Hash Join (cost=15638.06..487618.47 rows=1200238 width=60) (actual time=276.860..9921.125 rows=1199122 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311676 read=343 -> Seq Scan on orders (cost=0.00..403671.84 rows=15014984 width=8) (actual time=0.016..3059.893 rows=15015000 loops=1) Buffers: shared hit=253510 read=12 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=276.676..276.676 rows=119987 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10781kB Buffers: shared hit=58166 read=331 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.046..237.647 rows=119987 loops=1) Buffers: shared hit=58166 read=331 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.137..0.314 rows=2 loops=1) Join Filter: (((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'GERMANY'::bpchar)) OR ((n1.n_name = 'GERMANY'::bpchar) AND (n2.n_name = 'MOROCCO'::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=0.018..0.034 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=0.005..0.007 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=16.321..108.209 rows=59994 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58163 read=331 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=10.716..10.716 rows=59994 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=5 read=330 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=59.045..59.045 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=0.011..32.214 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 42148.104 ms (53 rows) COMMIT; COMMIT