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 = 'ROMANIA' and n2.n_name = 'INDIA') or (n1.n_name = 'INDIA' and n2.n_name = 'ROMANIA') ) 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=2361263.42..2363168.64 rows=58622 width=64) (actual time=106457.505..106484.283 rows=4 loops=1) Buffers: shared hit=1092604 read=339503 written=290 -> Sort (cost=2361263.42..2361409.98 rows=58622 width=64) (actual time=106448.483..106452.495 rows=60162 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: 9997kB Buffers: shared hit=1092604 read=339503 written=290 -> Hash Join (cost=897268.61..2356620.81 rows=58622 width=64) (actual time=53054.470..105966.635 rows=60162 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1092596 read=339503 written=290 -> Hash Join (cost=892589.61..2321751.24 rows=1465562 width=72) (actual time=52909.531..102117.931 rows=1464466 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1090414 read=339503 written=290 -> Bitmap Heap Scan on lineitem (cost=388024.25..1733777.05 rows=18334187 width=20) (actual time=17958.041..42418.518 rows=18247443 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=787866 read=329094 written=289 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..383440.70 rows=18334187 width=0) (actual time=16611.438..16611.438 rows=18320255 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 written=18 -> Hash (cost=489502.50..489502.50 rows=1205029 width=60) (actual time=34950.436..34950.436 rows=1200827 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107887kB Buffers: shared hit=302548 read=10409 written=1 -> Hash Join (cost=15638.06..489502.50 rows=1205029 width=60) (actual time=596.716..32962.490 rows=1200827 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=302548 read=10409 written=1 -> Seq Scan on orders (cost=0.00..405283.20 rows=15074920 width=8) (actual time=0.013..6432.854 rows=15015000 loops=1) Buffers: shared hit=244481 read=10053 written=1 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=596.517..596.517 rows=120263 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10805kB Buffers: shared hit=58067 read=356 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=29.368..527.523 rows=120263 loops=1) Buffers: shared hit=58067 read=356 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.195..0.435 rows=2 loops=1) Join Filter: (((n1.n_name = 'ROMANIA'::bpchar) AND (n2.n_name = 'INDIA'::bpchar)) OR ((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'ROMANIA'::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=0.020..0.041 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..0.009 rows=25 loops=1) Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=34.391..248.382 rows=60132 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=58064 read=356 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=25.636..25.636 rows=60132 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=2 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=144.414..144.414 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=0.015..97.394 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 106525.422 ms (53 rows) COMMIT; COMMIT