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 = 'RUSSIA' and n2.n_name = 'UNITED STATES') or (n1.n_name = 'UNITED STATES' and n2.n_name = 'RUSSIA') ) 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=2357879.67..2359773.05 rows=58258 width=64) (actual time=141788.351..141818.108 rows=4 loops=1) Buffers: shared hit=1240203 read=193376 written=3736 -> Sort (cost=2357879.67..2358025.31 rows=58258 width=64) (actual time=141774.612..141784.038 rows=58724 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: 9795kB Buffers: shared hit=1240203 read=193376 written=3736 -> Hash Join (cost=895209.61..2353268.50 rows=58258 width=64) (actual time=71716.037..141383.089 rows=58724 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=1240195 read=193376 written=3736 -> Hash Join (cost=890530.61..2318581.73 rows=1456695 width=72) (actual time=71561.074..137164.238 rows=1461949 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1238013 read=193376 written=3736 -> Bitmap Heap Scan on lineitem (cost=385479.26..1730626.19 rows=18223262 width=20) (actual time=21133.180..63535.308 rows=18247594 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=962315 read=155700 written=3734 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..380923.45 rows=18223262 width=0) (actual time=20364.011..20364.011 rows=18338343 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared read=49815 -> Hash (cost=489973.51..489973.51 rows=1206227 width=60) (actual time=50423.927..50423.927 rows=1204054 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 108177kB Buffers: shared hit=275698 read=37676 written=2 -> Hash Join (cost=15638.06..489973.51 rows=1206227 width=60) (actual time=2908.283..49408.684 rows=1204054 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=275698 read=37676 written=2 -> Seq Scan on orders (cost=0.00..405686.04 rows=15089904 width=8) (actual time=0.016..13498.868 rows=15015000 loops=1) Buffers: shared hit=251668 read=3119 written=2 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=2908.105..2908.105 rows=120071 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10788kB Buffers: shared hit=24030 read=34557 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=41.621..2793.580 rows=120071 loops=1) Buffers: shared hit=24030 read=34557 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.269..0.353 rows=2 loops=1) Join Filter: (((n1.n_name = 'RUSSIA'::bpchar) AND (n2.n_name = 'UNITED STATES'::bpchar)) OR ((n1.n_name = 'UNITED STATES'::bpchar) AND (n2.n_name = 'RUSSIA'::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..0.039 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=0.005..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=41.242..1370.261 rows=60036 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=24027 read=34557 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=30.620..30.620 rows=60036 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=334 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=147.634..147.634 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=0.017..104.856 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 141858.265 ms (53 rows) COMMIT; COMMIT