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 = 'GERMANY' and n2.n_name = 'INDONESIA') or (n1.n_name = 'INDONESIA' and n2.n_name = 'GERMANY') ) 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=2362118.87..2364015.99 rows=58373 width=64) (actual time=160509.496..160536.154 rows=4 loops=1) Buffers: shared hit=1053548 read=382640 written=558 -> Sort (cost=2362118.87..2362264.80 rows=58373 width=64) (actual time=160499.085..160505.085 rows=58418 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: 9752kB Buffers: shared hit=1053548 read=382640 written=558 -> Hash Join (cost=896554.88..2357497.76 rows=58373 width=64) (actual time=71324.225..160117.806 rows=58418 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1053540 read=382640 written=558 -> Hash Join (cost=891875.88..2322751.65 rows=1459576 width=72) (actual time=71131.503..155782.056 rows=1464545 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1051358 read=382640 written=558 -> Bitmap Heap Scan on lineitem (cost=385848.73..1733656.33 rows=18259307 width=20) (actual time=21438.721..79615.596 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=745650 read=374479 written=558 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..381283.90 rows=18259307 width=0) (actual time=20760.793..20760.793 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=106 read=49709 written=486 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=49691.912..49691.912 rows=1206010 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108353kB Buffers: shared hit=305708 read=8161 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=1930.110..48300.792 rows=1206010 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=305708 read=8161 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.016..12150.653 rows=15015000 loops=1) Buffers: shared hit=247302 read=7993 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1929.896..1929.896 rows=120389 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10817kB Buffers: shared hit=58406 read=168 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=69.257..1827.653 rows=120389 loops=1) Buffers: shared hit=58406 read=168 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.125..0.446 rows=2 loops=1) Join Filter: (((n1.n_name = 'GERMANY'::bpchar) AND (n2.n_name = 'INDONESIA'::bpchar)) OR ((n1.n_name = 'INDONESIA'::bpchar) AND (n2.n_name = 'GERMANY'::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=0.014..0.040 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.38 rows=25 width=30) (actual time=0.001..0.004 rows=25 loops=25) Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.004..0.008 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=49.280..890.283 rows=60194 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58403 read=168 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=39.559..39.559 rows=60194 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=185.607..185.607 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=0.014..133.074 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 160570.571 ms (53 rows) COMMIT; COMMIT