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 = 'ARGENTINA' and n2.n_name = 'MOROCCO') or (n1.n_name = 'MOROCCO' and n2.n_name = 'ARGENTINA') ) 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=2360868.75..2362767.66 rows=58428 width=64) (actual time=76003.479..76032.923 rows=4 loops=1) Buffers: shared hit=527051 read=906239 dirtied=728 written=89612 -> Sort (cost=2360868.75..2361014.82 rows=58428 width=64) (actual time=75992.717..76002.151 rows=58297 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: 9735kB Buffers: shared hit=527051 read=906239 dirtied=728 written=89612 -> Hash Join (cost=896694.37..2356242.90 rows=58428 width=64) (actual time=37552.753..75701.148 rows=58297 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=527043 read=906239 dirtied=728 written=89612 -> Hash Join (cost=892015.37..2321441.16 rows=1462316 width=72) (actual time=37469.463..72594.988 rows=1457147 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=524861 read=906239 dirtied=728 written=89612 -> Bitmap Heap Scan on lineitem (cost=386964.02..1733165.72 rows=18293580 width=20) (actual time=13832.148..30085.502 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=212108 read=905907 dirtied=728 written=89612 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..382390.63 rows=18293580 width=0) (actual time=13231.155..13231.155 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=1 read=49814 written=97 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=23636.504..23636.504 rows=1196699 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107516kB Buffers: shared hit=312753 read=332 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=338.073..22804.028 rows=1196699 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=312753 read=332 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.014..3949.446 rows=15015000 loops=1) Buffers: shared hit=254787 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=337.919..337.919 rows=119675 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10753kB Buffers: shared hit=57966 read=332 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=17.077..297.534 rows=119675 loops=1) Buffers: shared hit=57966 read=332 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.085..0.314 rows=2 loops=1) Join Filter: (((n1.n_name = 'ARGENTINA'::bpchar) AND (n2.n_name = 'MOROCCO'::bpchar)) OR ((n1.n_name = 'MOROCCO'::bpchar) AND (n2.n_name = 'ARGENTINA'::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=0.019..0.042 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=0.004..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=17.113..136.625 rows=59838 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=57963 read=332 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=11.533..11.533 rows=59838 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=3 read=332 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=81.527..81.527 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=0.009..54.008 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 76062.166 ms (53 rows) COMMIT; COMMIT