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 = 'GERMANY') or (n1.n_name = 'GERMANY' 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=2369081.05..2370993.42 rows=58842 width=64) (actual time=78941.578..78963.644 rows=4 loops=1) Buffers: shared hit=938072 read=497964 dirtied=1068 written=1635 -> Sort (cost=2369081.05..2369228.16 rows=58842 width=64) (actual time=78934.108..78937.606 rows=59092 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: 9846kB Buffers: shared hit=938072 read=497964 dirtied=1068 written=1635 -> Hash Join (cost=900011.10..2364419.43 rows=58842 width=64) (actual time=40747.443..78672.453 rows=59092 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (n1.n_nationkey = supplier.s_nationkey)) Buffers: shared hit=938064 read=497964 dirtied=1068 written=1635 -> Hash Join (cost=895332.10..2329404.84 rows=1472648 width=72) (actual time=40668.858..75548.046 rows=1465225 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=935882 read=497964 dirtied=1068 written=1635 -> Bitmap Heap Scan on lineitem (cost=389304.94..1739565.54 rows=18422840 width=20) (actual time=15242.338..29131.536 rows=18247062 loops=1) Recheck Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=674637 read=445492 dirtied=1068 written=1635 -> Bitmap Index Scan on lineitem_l_shipdate_l_suppkey__idx (cost=0.00..384699.23 rows=18422840 width=0) (actual time=14614.309..14614.309 rows=18374583 loops=1) Index Cond: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date)) Buffers: shared hit=3 read=49812 -> Hash (cost=490919.26..490919.26 rows=1208632 width=60) (actual time=25425.748..25425.748 rows=1201662 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 107962kB Buffers: shared hit=261245 read=52472 -> Hash Join (cost=15638.06..490919.26 rows=1208632 width=60) (actual time=1092.238..24722.730 rows=1201662 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=261245 read=52472 -> Seq Scan on orders (cost=0.00..406494.91 rows=15119991 width=8) (actual time=0.019..4414.697 rows=15015000 loops=1) Buffers: shared hit=237460 read=17835 -> Hash (cost=14139.26..14139.26 rows=119904 width=60) (actual time=1092.026..1092.026 rows=120201 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 10800kB Buffers: shared hit=23785 read=34637 -> Nested Loop (cost=905.09..14139.26 rows=119904 width=60) (actual time=19.613..845.149 rows=120201 loops=1) Buffers: shared hit=23785 read=34637 -> Nested Loop (cost=0.00..28.00 rows=2 width=60) (actual time=0.162..0.384 rows=2 loops=1) Join Filter: (((n1.n_name = 'ROMANIA'::bpchar) AND (n2.n_name = 'GERMANY'::bpchar)) OR ((n1.n_name = 'GERMANY'::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=0.028..0.051 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=0.006..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=19.894..400.490 rows=60100 loops=2) Recheck Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=23782 read=34637 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=13.178..13.178 rows=60100 loops=2) Index Cond: (c_nationkey = n2.n_nationkey) Buffers: shared hit=1 read=335 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=77.743..77.743 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..49.479 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 78998.823 ms (53 rows) COMMIT; COMMIT